This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles

for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Designation: D8342/D8342M − 21

Standard Test Method for

Measuring the Probability of a Full Length Burn on a
Cannabis/Hemp Pre-roll1
This standard is issued under the fixed designation D8342/D8342M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

1. Scope mendations issued by the World Trade Organization Technical

1.1 This fire-test-response standard provides a standard Barriers to Trade (TBT) Committee.
measure of the probability of a cannabis/hemp pre-roll posi-
tioned on a substrate to generate enough heat to continue 2. Referenced Documents
burning and thus potentially cause ignition of bedding or 2.1 ASTM Standards:2
upholstered furniture. D8245 Guide for Disposal of Resin-Containing Cannabis
1.2 This test method shall be applicable to pre-roll units that Raw Materials and Downstream Products
are intended for personal inhalation by means of combustion D8343/D8343M Practice for Measuring the Physical Prop-
and contain dried herbal material from any type of a cannabis erties of Cannabis/Hemp Pre-rolls
plant, that is, cannabis/hemp. For the sake of brevity, the term E177 Practice for Use of the Terms Precision and Bias in
“cannabis” shall be used henceforth to refer to any type of ASTM Test Methods
cannabis plant (cannabis/hemp). E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.3 This test method shall be applicable to pre-rolls that E1352 Test Method for Cigarette Ignition Resistance of
burn along the length of a cannabis pre-roll column. Mock-Up Upholstered Furniture Assemblies
1.4 This test method shall not be applicable to infused E1353 Test Methods for Cigarette Ignition Resistance of
pre-rolls, which are outside the scope of this standard. Components of Upholstered Furniture
1.5 Pre-roll preparation and sampling shall be made using 2.2 NFPA Standards:3
Practice D8343/D8343M. NFPA 260 Standard Methods of Tests and Classification
Systems for Cigarette Ignition Resistance of Components
1.6 Units—The values stated in either SI units or United
of Upholstered Furniture (2019)
States Customary units (USC units) are to be regarded sepa-
NFPA 261 Standard Method of Test for Determining Resis-
rately as standard. The values stated in each system may not be
tance of Mock-up Upholstered Furniture Material Assem-
exact equivalents; therefore, each system shall be used inde-
blies to Ignition by Smoldering Cigarettes (2018)
pendently of the other. Combining values from the two systems
may result in non-conformance with the standard. Metric units 2.3 Other Standards:
will be stated as standard and USC units will be shown in 16 CFR 1632 Standard for the Flammability of Mattresses
brackets relative to the metric units. and Mattress Pads (FF 4-72, Amended)4
NIST 851-2 Test Methods for Quantifying the Propensity of
1.7 This standard does not purport to address all of the
Cigarettes to Ignite Soft Furnishings, Volume 25
safety concerns, if any, associated with its use. It is the
NIST 1436 Relative Ignition of Propensity of Test Market
responsibility of the user of this standard to establish appro-
Cigarettes5
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accor-
2
dance with internationally recognized principles on standard- For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ization established in the Decision on Principles for the Standards volume information, refer to the standard’s Document Summary page on
Development of International Standards, Guides and Recom- the ASTM website.
3
Available from National Fire Protection Association (NFPA), 1 Batterymarch
Park, Quincy, MA 02169-7471, http://www.nfpa.org.
1 4
This test method is under the jurisdiction of ASTM Committee D37 on Available from U.S. Government Printing Office, Superintendent of
Cannabis and is the direct responsibility of Subcommittee D37.04 on Processing and Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://
Handling. www.access.gpo.gov.
5
Current edition approved June 1, 2021. Published September 2021. DOI: Available from National Institute of Standards and Technology (NIST), 100
10.1520/D8342_D8342M-21. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States

1
 D8342/D8342M − 21
3. Terminology 3.2.6 QMS—quality management system
3.1 Definitions of Terms Specific to This Standard: 4. Summary of Test Method
3.1.1 crutch filter, n—a filter composed of thin paper mate-
4.1 This test method measures the probability that a pre-roll,
rial used in a pre-roll for preventing particles from being
placed on a substrate, will generate enough heat to continue
inhaled. Also provides stability and allows cannabis herbal
burning until it self-extinguishes or completely combusts. Each
material to be fully combusted. (See Fig. 1.)
test determination consists of placing a lit pre-roll on a
3.1.2 crutch pre-roll, n—a type of pre-roll that contains a horizontal surface consisting of a pre-determined set number of
crutch filter and uses a single wrapping paper, which can be layers of laboratory filter paper on a flat surface for support.
conical, cylindrical, or other shapes. (See Fig. 1.) Testing will begin with two substrates consisting of 15 and 10
3.1.3 determination, n—the act of coming to a decision or of layers of filter paper respectively for a full-length burn. If no
fixing or setting a purpose. full-length burn is observed with substrates of 15 and 10 layers
3.1.4 filter pre-roll, n—a type of pre-roll that contains filter of filter paper, then substrates consisting of three layers of filter
material and uses a tipping paper. paper are assembled and used for the duration of the test.
Observation is made of whether or not the pre-roll continues to
3.1.5 full-length burn, n—the outcome of a determination in burn to the beginning or to the end of the crutch or filter, or
which the pre-roll burns to or past the front plane of the crutch both (see Fig. 1). Thirty determinations (comprising one test)
filter or, if the pre-roll has no filter, past the tips of the metal are performed to determine the probability that the pre-roll will
pins. (See Fig. 3.) continue burning despite heat abstraction by the substrate. The
3.1.6 infused pre-roll, n—a type of pre-roll that combines number of determinations can vary on a case-by-case basis
dried cannabis herbal material (flower or leaf) and other dependent on sample size. Sample size should represent a
cannabinoid containing materials (for example, kief, wax, statistical size of production batches when using this test
crumble, etc.) including resins and/or extracts. method for analyzing pre-rolls meant for sale.
3.1.6.1 Discussion—Kief, wax, and crumble are common 4.2 This test method also measures the moisture content of
names used in the cannabis industry for malleable texture the cannabis herbal material in the pre-roll using a moisture
concentrates that can be sprinkled over top dried cannabis content measuring device.
herbal material.
3.1.7 moisture content, n—the quantity of water contained 5. Significance and Use
in a material. Used in a wide range of scientific and technical 5.1 According to statistics provided by the NFPA, one of the
areas and expressed as a ratio or percentage, which can range most common initiating events in a fatal fire is the dropping of
from completely dry to the value of the materials’ porosity at a smoking material, such as a pre-roll, onto a bed or a piece of
saturation. upholstered furniture. Test Methods E1352 and E1353 and
3.1.8 moisture content (MC) measuring device, n—an ana- NFPA 261 and NFPA 260 have been developed to evaluate the
log or electronic device with a sensor or detector used to susceptibility of upholstered furniture mock-ups and compo-
measure the moisture content in materials capable of measur- nents to ignition by cigarettes (similarly for pre-rolls). Federal
ing within 65 % moisture content. Standard 16 CFR 1632 was promulgated to reduce the likeli-
hood that mattresses and mattress pads would ignite from a
3.1.9 substrate, n—a material that provides the surface on lighted smoking material. Research of test methods (NIST
which something is deposited. 851-2) has found that filter paper substrates can be used to
3.2 Abbreviated Term—Acronyms and Initialisms: replace the fabric/padding assembly with multiple layers of
3.2.1 CFR—Code of Federal Regulations common filter paper showing a systematic progression in
3.2.2 MC—moisture content. measuring ignition strength. Additionally, smoking materials
with high percentages of full-length burns on filter paper
3.2.3 NFPA—National Fire Protection Association
substrates (NIST 1436) generate enough heat to keep burning
3.2.4 PMMA—polymethyl methacrylate and thus are more likely to ignite soft furnishings than smoking
3.2.5 RH—relative humidity materials with lower percentages of full-length burns.

FIG. 1 Crutch Pre-roll

2
 D8342/D8342M − 21
5.2 In this test method, the pre-rolls are subjected to a set of 6.1.3.2 Substrate #2—10 layers of filter papers.
laboratory conditions. If different conditions are substituted or 6.1.3.3 Substrate #3—3 layers of filter papers
the end-use conditions are changed, it may not be possible to
use this test method to predict quantitative changes in the fire 6.2 Moisture Content Measuring Device:
test response. Therefore, the quantitative results are valid only 6.2.1 Near Infrared Reflectance Spectroscopy (NIRS) Mois-
for the fire test exposure conditions described in this test ture Meter, suited for the real-time measurement of moisture
method. Pre-roll preparation and sampling are very important content, capable of measuring within 65 % MC.
to ensure minimal impact on results. Preparation shall be made
6.3 Test Chamber:
using Practice D8343/D8343M.
6.3.1 A test chamber, as pictured in Fig. 2, shall be
5.3 This test method outlines the moisture content of can- constructed of clear plastic material, such as polymethyl
nabis herbal material in the pre-roll. Determining the moisture methacrylate (PMMA), or similarly clear rigid material, nomi-
content of cannabis herbal material used will shed more light nal 5 mm [0.20 in.] in thickness. The test chamber inside
on the effects of moisture on the probability of a pre-roll to dimensions shall be as follows: height: 402 mm 6 5 mm
achieve a full-length burn when ignited. [15.8 in. 6 0.20 in.], width: 352 mm 6 5 mm [13.8 in. 6
5.4 The data from this test method can help extrapolate 0.20 in.], and depth: 298 mm 6 5 mm [11.73 in. 6 0.20 in.].
whether a sample set of pre-rolls would maintain ignition if The full front panel of the chamber shall be hinged with a latch
remained untouched. for closure. Standard silicone adhesive strip seals, width
5.5 This test method can be used to determine the probabil- 12.7 mm 6 1 mm [0.5 in. 6 0.04 in.], thickness 1 mm 6
ity of a full-length burn on cannabis/hemp pre-roll. 0.5 mm [0.04 in. 6 0.02 in.] shall be applied to the outer front
panel surface, on top, bottom, and latch sides. Silicone adhe-
6. Apparatus sive strip seals shall extend approximately 6.35 mm [0.25 in.]
6.1 Substrates: from three outer edges along the lengths, to ensure the door
6.1.1 Filter Paper, Grade 1, ash-free cellulose filter paper seals tight when closed.
shall be used as the filter paper for substrate formation. 6.3.2 The top panel of the chamber shall contain a centered
Characteristics: nominal diameter of 150 mm [6 in.], nominal round opening of diameter of 152.7 mm 6 1 mm [6.01 in. 6
ash content ≤0.06 %, pore size: 11 µm [0.00043 in.] (particle 0.04 in.] from which a cylindrical plastic chimney, with the
retention), nominal thickness 180 µm [0.0071 in.], base weight same inside diameter and nominal thickness of 5 mm [0.20 in.],
87 g/m2 [0.029 oz/yd2]. will extend 165 mm 6 6 mm [6.50 in. 6 0.24 in.] above the
6.1.2 Filter Paper—The mean mass of 15 sheets of filter chamber. The chimney shall be sealed to the outer top panel
papers shall be 23 g 6 0.5 g [0.81 oz 6 0.017 oz]. surface.
6.1.3 Substrates shall be formed by placing multiple layers 6.3.3 A flat top chimney cover shall be constructed with an
of filter papers as applicable per test requirement and procedure internal seal to sit on top of the cylindrical chimney as shown
in Section 11. in Fig. 2. The flat top chimney cover dimensions shall be as
6.1.3.1 Substrate #1—15 layers of filter papers. follows: inner diameter: 175 mm 6 1 mm [6.9 in. 6 0.04 in.]

FIG. 2 Test Chamber

3
 D8342/D8342M − 21
cylinder diameter to 150.4 mm 6 1 mm [5.92 in. 6 0.04 in.],
inner diameter: 127 mm 6 1 mm [5 in. 6 0.04 in.], and height:
15.5 mm 6 1 mm [0.61 in. 6 0.04 in.]. The top surface of the
flange of the adaptor ring shall be flat to within 60.03 mm
[0.001 in.]. A schematic of the adaptor ring is shown in Fig. 5.
6.4.4 Metal Rim and Pins—A circular brass or other dense
metal rim, as shown in Fig. 6, shall be used as a weight to hold
the sheet(s) of filter paper flat against each other. The bottom
surface of the metal rim shall be flat to within 60.03 mm
[0.001 in.]. The metal rim dimensions shall be as follows: outer
diameter: 176.8 mm 6 1 mm [6.96 in. 6 0.04 in.], inner
diameter: 130 mm 6 1 mm [5.1 in. 6 0.04 in.].
6.4.4.1 Two pairs of parallel metal pins are to be located
20 mm 6 1 mm [0.79 in. 6 0.04 in.] from center, opposite to
each other. The pins are welded to the metal rim, 10 mm 6
0.5 mm [0.4 in. 6 0.02 in.] above the bottom surface of metal
rim. Each pin, 2 mm 6 0.05 mm [0.08 in. 6 0.02 in.] in
FIG. 3 Substrate Holder Assembly
diameter and located 6.3 mm 6 0.05 mm [0.32 in. 6 0.02 in.]
apart, shall protrude 17 mm 6 4 mm [0.65 in. 6 0.15 in.]
toward the center of the metal rim in a horizontal position. The
metal pins serve as a pre-roll holder to support the non-ignited
(filter side) of the lit pre-roll in a horizontal position without
pressing or compressing the pre-roll. The metal pins should not
be in contact with the pre-roll lit end.
6.4.4.2 The mass of the metal rim shall be 600 g 6 10 g
[21.16 oz 6 0.035 oz]. If the mass of a rim is lower, a stacked
second metal rim shall bring the total mass to 600 g 6 10 g
[21.16 oz 6 0.035 oz].
6.5 Pre-roll Ignition System:
6.5.1 A system consisting of an air draw component, a
pre-roll holder, and an ignition source shall be used to ignite
the test pre-rolls.
6.5.2 Air Draw Component (Part of Canopy and Exhaust
System)—A standard laboratory air draw component shall be
FIG. 4 Substrate Holder
used such as a flexible “spot exhaust,” “snorkel,” or similar
fume exhaust hose and shall be connected to the chimney of the
and inner height: 63.5 mm 6 1 mm [2.5 in. 6 0.04 in.]; chamber and have sufficient air flow to slowly draw air from
nominal thickness of 5 mm [0.20 in.]. the pre-rolls once lit to establish uniform end burn.
6.4 Substrate Holder Assembly: Fig. 3. 6.5.3 Pre-roll Holder—The pre-roll holder shall be used to
6.4.1 An apparatus composed of components: a substrate support the lit pre-roll in a horizontal position to establish a
holder, an adaptor ring, a metal rim, and metal pins. uniform end burn prior to the placement of the pre-roll into the
6.4.2 Substrate Holder—The substrate holder, as shown in substrate holder. The pins are to be spaced to keep the
Fig. 4, shall be made of PMMA or similarly rigid material with non-ignited end of the pre-roll from rolling, but without
three legs for stability to sit above the chamber floor. The compressing the pre-roll. If a pre-roll with a significantly
substrate holder dimensions shall be as follows: outer diameter: different diameter is to be tested, other pairs of pins, appropri-
165.6 mm 6 1 mm [6.51 in. 6 0.04 in.], inner diameter: ately spaced, shall be inserted into the block. The holder shall
127 mm 6 1 mm [5 in. 6 0.04 in.], and total height: 82.9 mm not clamp the pre-roll nor stress it in any other manner, nor
6 1 mm [3.26 in. 6 0.04 in.] inclusive of the three legs shall it contact the pre-roll within a nominal 30 mm [1.2 in.] of
approximately 20 mm [0.80 in.] in height. The legs approxi- its lit end.
mately 80 mm [3.15 in.] wide will be spaced 120° 6 5° apart 6.5.4 Ignition Source:—A butane gas lighter or other similar
around the bottom surface of substrate holder perimeter. The type device shall be used for lighting the pre-roll.
top surface of the substrate holder shall have a recess diameter 6.6 Exhaust System:
152.8 mm 6 1 mm [6 in. 6 0.04 in.], 2.5 mm [0.01 in.] deep. 6.6.1 An exhaust system, such as that contained in a
6.4.3 Adaptor Ring—An adaptor ring to support the filter chemical fume or canopy style hood with direct air flow
paper substrate shall be made of PMMA or other similarly rigid through the hood, shall be used for removing pre-roll and
material. The adaptor ring dimensions shall be as follows: substrate combustion products during the test. The system shall
outer flange diameter: 176.8 mm 6 1 mm [6.96 in. 6 0.04 in.], contain an appropriate filtering media, such as an activated
flange thickness 5.5 mm 6 1 mm [0.22 in. 6 0.04 in.], outer charcoal filter or activated carbon filter, to remove pre-roll

4
 D8342/D8342M − 21

FIG. 5 Schematic of Adaptor Ring

extinguishing equipment will be immediately available during

testing to suppress any fires that exceed normal controlled
limits.
7.3 Personnel will take proper precautions to avoid inhaling
combustion products.
7.4 Exhaust systems shall be used and checked regularly in
accordance with manufacturing specifications in accordance to
QMS measures.
7.5 The user shall ensure that all burning has ceased before
discarding used test materials. An appropriate closed waste
container shall be used for safe disposal of pre-rolls and test
assemblies after being exposed to heat and fire.
FIG. 6 Metal Rim and Metal Pins
7.6 This test method involves the use of apparatus and
equipment at high temperature and must be handled with care
smoke and condensable combustion gases. Airflow through the in accordance with manufacturer’s specifications and QMS
hood shall be sufficient to remove pre-roll and substrate measures. The user will take proper precautions to avoid
combustion products while not being high enough to influence thermal injury.
the combustion process in the test chamber.
6.7 Extinguishing System: 8. Sampling, Test Specimens, and Test Units
6.7.1 Following a test cycle, the pre-roll and sheets of filter 8.1 Pre-roll Preparation:
paper shall be completely extinguished by smothering or other 8.1.1 Pre-roll preparation, sampling, and handling are very
suitable process, such as application of water. important to ensure minimal impact on results. Preparation
shall be made using Practice D8343/D8343M.
7. Hazards
8.2 Pre-rolls:
7.1 This test method involves the use of combustible mate- 8.2.1 All pre-rolls used in this test method shall be handled
rials that are exposed to ignition sources. Consequently, the by holding the un-lit crutch filter section of the pre-roll at all
user will take proper precautions to avoid thermal injuries. times with clean and gloved hands only.
7.2 Personnel shall be trained and instructed in accordance 8.2.2 Prior to the ignition test, all pre-roll test specimens
to quality management system (QMS) measures on general shall be marked using a soft graphite pencil at 10 mm 6 1 mm
procedures of how to handle an unwanted fire. Appropriate fire [0.39 in. 6 0.04 in.] and 20 mm 6 1 mm [0.79 in. 6 0.08 in.]

5
 D8342/D8342M − 21
respectively from the end of the pre-roll that will be lit (see Fig. ensure uniform burn. The pre-roll is then watched until it
1). The marks are used to account for the twisted end of the ignites the substrate or burning stops.
pre-roll in order to establish a uniform beginning and end of a 11.1.3 Testing will begin with substrate #1 and substrate #2
pre-roll. Neither the process of marking the pre-roll nor the respectively for a full-length burn. If no full-length burn is
mark itself shall significantly affect the pre-roll burn rate. observed with substrate #1 and substrate #2, then a substrate #3
8.3 Cannabis Herbal Material: will be assembled and used for the duration of the test.
8.3.1 All cannabis herbal material shall be milled to ap- 11.2 Moisture Content Measuring:
proximately 3 mm [0.12 in.] to 5 mm [0.20 in.] particle size. 11.2.1 If applicable, turn on and tare the moisture content
8.3.2 All cannabis herbal material shall be handled with measuring device.
clean and gloved hands. 11.2.2 Place the cannabis herbal material sample in the
moisture content measuring device as in accordance with the
9. Calibration and Standardization
device manufacturer’s instructions.
9.1 Calibration of all equipment used shall be carried out as 11.2.3 Record the moisture content in Table A1.2.
in accordance with manufacturer’s specifications in accordance 11.2.4 Dispose of each cannabis herbal material sample
to QMS measures. after each measurement following Guide D8245.
9.2 The test chamber shall be checked before use to monitor 11.3 Pre-roll Burn Testing:
air leakage to ensure that smoke plumes from pre-rolls are 11.3.1 If applicable, turn on the exhaust system designated
undisturbed during testing. Door seals shall be checked visu- for the removal of test combustion from pre-rolls approxi-
ally to ensure proper sealing. All constructed equipment seams mately 30 minutes prior to beginning testing.
shall be inspected to ensure they are airtight and there are no
11.3.2 Ensure that the substrate holder and adaptor ring are
cracks visible on the surface of the chamber. If issues are
in the test chamber at the geometric center of the chamber’s
detected, measures shall be taken to ensure these are rectified
bottom. Cover the chimney on the test chamber.
and rechecked before test commencement.
11.3.3 Place the appropriate substrate consistent of layers of
9.3 The relative humidity and temperature sensors used filter papers oriented with the rough surface facing upwards,
must meet test method limits and shall be calibrated as in centered on top of the adaptor ring located in the substrate
accordance with manufacturer’s specifications in accordance to holder assembly. Place the metal rim weight centered on top to
QMS measures. ensure good contact between layers of filter papers. Discard
9.4 The moisture measuring device used shall be calibrated any filter papers that will not lay flat and replace with new filter
as in accordance with manufacturer’s specifications in accor- papers to meet appropriate number of filter papers for substrate
dance to QMS measures. required and test requirement. Record layers of filter paper in
Table A1.2.
10. Conditioning 11.3.4 Ensure metal pins on the metal rim are flat and
10.1 Test and Conditioning Environment: project in a horizontal position and do not touch the filter paper
10.1.1 An environmental conditioning room will be main- substrate. Ensure chimney cover is present.
tained to provide adequate conditioning environment for both 11.3.5 Remove pre-roll from the conditioned space.
the pre-rolls and filter paper substrates to meet testing require- 11.3.6 Hold the ignition flame in front of the marked end of
ments. Testing room environment temperatures shall be main- the pre-roll for as long as necessary to achieve a uniform
tained at 23 °C 6 3 °C [73.4 °F 6 5.4 °F] and 55 6 10 % RH. ignition without passing the 10 mm [0.39 in.] mark.
Additionally, pre-rolls should be stored as in accordance with NOTE 1—During the ignition process, the pre-roll is to be rotated as
the jurisdiction having oversight for the storage of cannabis needed to obtain a symmetrical burn.
material. If recommended temperature and humidity guidelines
conflict with local regulations, local regulations will be used. In 11.3.7 Place the unmarked end of the pre-roll horizontally
all instances, temperature and relative humidity of all pre-rolls between the metal pins and without delay simultaneously
tested should be consistent and recorded in the final report. remove the chimney cover and gently close the test chamber
door.
11. Procedure NOTE 2—No more than two pre-rolls shall be in the test chamber at any
11.1 Overview: given time. If the filter paper substrate is undisturbed after an ignition test,
it can be reused for other test determinations, provided coal or ash is not
11.1.1 In this procedure the moisture content of cannabis dropped on the filter paper substrate. If this happens during any part of the
herbal material in the pre-roll will be measured using a rotation or positioning process, terminate the test determination and begin
moisture content measuring device, and controlled burn testing again; do not count the attempt.
of pre-rolls will be performed. Three tests will be run, with 11.4 Record the Following Observations in Table A1.1:
each test using a different formed substrate (substrate #1,
11.4.1 The temperature, relative humidity, filter paper and
substrate #2, and substrate #3) as outlined in 6.1.3. Each
equipment unique identifier.
substrate is intended to approximate different thicknesses of
fabric types and furniture coverings. 11.5 Record the Following Observations in Table A1.2:
11.1.2 During each test, 30 determinations are performed. In 11.5.1 The moisture content of the cannabis herbal material
each determination, the pre-roll is ignited and prepared to in the pre-roll.

6
 D8342/D8342M − 21
11.6 Record the Following Pre-roll Observations in Table 13.2.1 Repeatability Limit (r)—The difference between re-
A1.2: petitive results obtained by the same operator in a given
11.6.1 If any of the pre-roll column burns to or past the laboratory applying the same test method with the same
crutch filter or metal pins. apparatus, under constant operating conditions, on identical
11.6.2 If the burning ceases before reaching the front of test material, within short intervals of time, would in the long
crutch filter section of the pre-roll or the metal pins. run, in the normal and correct operation of the test method,
11.6.3 If the pre-roll self-extinguishes, terminate the deter- exceed the following values only in one case in 20.
mination and record the result as a self-extinguishment. 13.2.1.1 Repeatability can be interpreted as maximum dif-
11.7 Once a determination is complete, open the test cham- ference between two results, obtained under repeatability
ber door to allow air to circulate and prepare for the next conditions, that is accepted as plausible due to random causes
determination. under normal and correct operation of the test method.
11.8 Repeat the determination with each pre-roll 30 times 13.2.2 Reproducibility Limit (R)—The difference between
per test to determine the probability that a pre-roll will achieve two single and independent results obtained by different
a full-length burn. Record observations in Table A1.2. This operators applying the same test method in different
probability is the test result. laboratories, using different apparatus on identical test material
would, in the long run, in the normal and correct operation of
12. Test Report
the test method, exceed the following values only in one case
12.1 Results are reported for the probability of a pre-roll to in 20.
achieve a full-length burn for each test determination. 13.2.2.1 Reproducibility can be interpreted as maximum
12.2 Report the laboratory name and the name of the person difference between two results, obtained under reproducible
performing the determination. conditions, that is accepted as plausible due to random causes
12.3 Report the following information for each test using a under normal and correct operation of the test method.
form similar to that of the one shown in Table A1.1 and Table 13.2.2.2 Reproducibility limits cannot be estimated from
A1.2: test results from fewer than three laboratories.
12.3.1 The temperature and relative humidity in the 13.2.3 The above terms (repeatability limit and reproduc-
laboratory, ibility limit) are used as specified in Practice E177.
12.3.2 The date and start time of each determination,
13.2.4 Any judgment in accordance with 13.2.1 would
12.3.3 Pre-roll identification including moisture content,
normally have an approximate 95 % probability of being
12.3.4 The number of layers of filter paper per
determination, correct, however the precision statistics obtained in this rug-
12.3.5 The probability that a pre-roll full-length burn per gedness testing must not be treated as exact mathematical
test determination, and quantities which are applicable to all circumstances and uses.
12.3.6 The observations noted in 11.6.1 – 11.6.3. The inclusion of a single laboratory reporting replicate results
essentially guarantees that there will be times when differences
13. Precision and Bias greater than predicted by the ruggedness testing results will
13.1 The precision of this test is based on ruggedness testing arise, sometimes with considerably greater or smaller fre-
conducted in 2019 by a single laboratory. The single laboratory quency than the 95 % probability limit would imply. Consider
participating in this study, measured varying numbers of the repeatability standard deviation as a general guide, and the
individual samples in order to determine several properties. associated probability of 95 % as only a rough indicator of
Every “test result” represents an average of 30 unique mea- what can be expected.
surements. Three replicate test results shall be reported as set 13.3 Bias—At the time of the study, there was no accepted
forth in Table A1.2. Furthermore, an interlaboratory study
reference material suitable for determining the bias for this test
(ILS) of this test method will need to be conducted for a
method, therefore no statement on bias is being made.
complete precision statement to be available.
13.3.1 The precision statement was determined through
13.2 Except for the number of participating laboratories, statistical examination of six test results, from a single
Practice E691 was followed for the design of the study and laboratory, averaged from multiple individual specimens
analysis of the data; the details are given in ASTM research
report RR:D37-2000.6
14. Keywords
6
14.1 cannabis; determination; filter paper; fire; flammabil-
Supporting data have been filed at ASTM International Headquarters and may
be obtained by requesting Research Report RR:D37-2000. Contact ASTM Customer ity; full-length burn; hemp; ignition; infused pre-roll; moisture
Service at service@astm.org. content; pre-roll; probability; substrate

7
 D8342/D8342M − 21
ANNEX

(Mandatory Information)

A1. REPORT TABLES

A1.1 See Table A1.1 and Table A1.2.

TABLE A1.1 Temperature, Relative Humidity, and Equipment Unique Identifier Sheet

Equipment Model No./Serial No./Unique Identifier No.

Moisture Content Measuring Device

Filter Paper

Record Temperature [°C]

Record Relative Humidity (%)

TABLE A1.2 Moisture Content, Number of Filter Papers Used, and Burning Determinations of Pre-rolls
3 Test % of Pre-roll
Probability of
Determination Substrate #1: Substrate #2: Substrate #3: % Moisture % Pre-roll that that Ceased % of Pre-roll
Pre-roll
n = 30 Content of Burns to or Past Burning Before that Self
Achieving a
Cannabis the Crutch Reaching the Extinguishes
Total = 90 Tests 15 Layers 10 Layers 3 Layers Full-length Burn
Crutch Filter
Test #1 10 10 10 15.8 % 0% 100 % 100 % 0%
Test #2 0 0 20 15.7 % 0% 100 % 100 % 0%
Test #3 0 0 30 15.6 % 0% 100 % 100 % 0%

RELATED MATERIAL

ASTM D8270 Terminology Relating to Cannabis Robinson, D. A., “Field Estimation of Soil Water Content: A Practical
ASTM E176 Terminology of Fire Standards Guide to Methods, Instrumentation and Sensor Technology,” Soil
ASTM E2187 Test Method for Measuring the Ignition Strength of Science Society of America Journal, Vol 73, No. 4, 2008, p. 131.
Cigarettes

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned
in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk
of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and
if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards
and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should
make your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above
address or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website
(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222
Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http://www.copyright.com/