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eu

Flexitallic Ltd is an international market leader

committed to providing high quality, high
value sealing products, backed by outstanding
customer service and technical support.
Flexitallic Ltd has the resources to maintain
a network of manufacturing sites, joint ventures
and licensees across the worlds major
industrialised regions - combining global
expertise with local availability. Furthermore
in an age when industry is increasingly focused
on international environmental standards and
emission regulations Flexitallic products make
a significant contribution to achieving a clean,
safe environment.
For the industrial buyer the name Flexitallic
is a guarantee of high standards, consistent
quality and a comprehensive product portfolio.
The Flexitallic product range can be single
sourced from any of its sales operations and
distributors around the world and is composed
of four primary product groups, usually
referred to as: Semi Metallic Gaskets, Sheet
Gasket Materials, Compression Packings and
Metallic Gaskets.
Each business throughout the world is able
to provide a highly professional level of technical
expertise and customer support. Most important of all every Flexitallic company is proud to
proclaim its ability to supply both standard and
special products - the result of local market
knowledge and awareness of customer needs.
SEALING SOLUTIONS THE ANSWER IS ALWAYS FLEXITALLIC

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WORLDWIDE REPUTATION

PRE-FORMED GRAPHITE RINGS - high tempera-

Flexitallic Ltd has been at the forefront of sealing

ture sealing elements formed from high purity exfoli-

technology for over 100 years. During this time the

ated graphite foil. Including Enviroflex 500,

company has gained an unrivalled reputation as a

Flexitallics high integrity valve stem sealing system.

global supplier of quality products and services.

SYNTRON PACKINGS - Extruded packings formed

An ethos of continuous development and

improvement of products and services coupled with

from a fibre reinforced, rubber bound composite,

used in domestic and industrial applications.

close attention to local market needs will ensure

All Flexitallics products are manufactured

the companys status as a worldwide market leader

to the highest quality standards ensuring fitness for

well into the next millennium.

purpose with the added convenience of a single

PRODUCT RANGE

source manufacturer and supplier.

The ability of a product to meet the requirements

RESEARCH AND DEVELOPMENT

of a dynamic market place is key to the success of

The dynamic needs of the market place can only

any company. The Flexitallic Group has the ability

be satisfied by manufacturers who are prepared

to supply the worlds industries with an unparalleled

to invest in research and development and

range of products and services - The Total

Flexitallic works continuously with highly respected

Sealing Solution.

and dedicated research centres worldwide. This is

Flexitallic Ltd manufactures a comprehen-

supported with specialist development work

sive range of asbestos-free compression packings:

undertaken at both UK manufacturing sites, by

BRAIDED PACKINGS - manufactured from a range

product teams aided by the latest technology such

of asbestos replacement yarns.

as Finite Element Analysis (FEA).

FEA is now being applied to the
development of compression packings and flange
sealing materials, proving a powerful new tool in
the advancement of sealing science.

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Finite Element Analysis of sealing element

components of Enviroflex system

TECHNICAL SUPPORT AND CUSTOMER SERVICE

COMPANY STATEMENT

The companys command of its technology pro-

The Products

vides a sound basis for technical and commercial

Flexitallic Ltd designs and manufactures all its

customer support. Qualified engineers are always

products under a quality system which is accredited

available for technical audits, advice on specifica-

to BS EN ISO 9001. The operating mission is to

tions or troubleshooting, whilst every sales office

produce an unrivalled level of excellence in product

has a full team of staff to deal with technical or

specification, performance and availability.

sales enquires by telephone, fax, e-mail or letter.

The People

The customer ethic is central to Flexitallics

The company is committed to meeting customer

philosophy and this is a further part of the global

needs and to the development, rights and equal

strategy which is apparent in every Flexitallic

opportunities of all its employees. Its track record

business throughout the world.

includes the prestigious IIP (Investor in People)

PRODUCT SELECTION

award.

Increasing environmental and economic pressures

The Environment

require that the most suitable product be used in

In the design and manufacture of its products

every application. This brochure is intended to aid

Flexitallic Ltd gives full consideration to environmental

the process of product selection.

concerns. By supplying cost-effective and proven

If you require more detailed information to

sealing products to industry the company con-

ensure compatibility, please consult Flexitallics

tributes not only to greater productivity and reduced

Technical Department who will be pleased to assist.

downtime, but also to the control and prevention

of fugitive emissions.

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TYPICAL
USES

305

PUMP
PACKINGS

TEMP
C
(F)

MAX
PRESSURE
MPa (psi)

MAX SHAFT
SPEED m/s
(fpm)

pH
LIMITS

TYPICAL
APPLICATIONS

DESCRIPTION

200/460
(-328/860)

18
(2610)

20
(3940)

0-14

petrochemical, chemical and

power generation industries

high purity exfoliated graphite gland

packing

-85/480
(-120/896)

14
(2030)

15
(2950)

3-12

petrochemical industry and general continuous filament FORTAGLAS**

industrial use
packing, impregnated with PTFE
dispersion and lubricated with mineral oil and graphite

COMMENTS

CONSTRUCTION PRODUCT

suitable for use in steam up to

650C

774

FLEXITALLIC 305

FLEXITALLIC 774
-85/290
(-120/554)

X-BRAID

10
(1970)

3-12

petrochemical, chemical, food,

pharmaceutical, paint and brewing
industries

continuous filament FORTAGLAS**

packing, impregnated with PTFE
dispersion and additional lubricants

FLEXITALLIC 713L

SQUARE BRAID

-85/260
(-120/500)

20
(2900)

20
(3940)

0-14

petrochemical, chemical, brewing,

paper and pulp industries

1065

BLOCKED RINGS

14
(2030)

713L

KEY TO ICONS USED

high quality packing made from

lubricated and graphite impregnated
PTFE yarn (GFO)*

STATIC SEALS

-85/260
(-120/500)

15
(2950)

2-12

FLEXITALLIC 1065

steel, chemical, paper, pulp and

PTFE impregnated aramid packing
cement industries; particularly rec- treated with a high temperature
ommended for pumping abrasive
lubricant
slurries

FLEXITALLIC 2001
14
(2030)

10
(1970)

3-12

803

150
(302)

for sealing water and mild chemicals

in general industrial applications;
suitable for applications involving
food or drinking water

acrylic yarn impregnated with PTFE

and containing additional lubricants

approved for use in contact with

potable (drinking) water

FLEXITALLIC 803
7
(1050)

8
(1575)

0-14

150
(302)

8
(1160)

5
(980)

5-10

26L

-85/260
(-120/500)

petrochemical, chemical, food,

pure PTFE yarn impregnated
pharmaceutical, brewing industries, with PTFE dispersion and
particularly suitable where
additional lubricants
extremes
of pH or contamination is a factor

FLEXITALLIC 26L

43

high quality lubricated flax packing

impregnated with PTFE dispersion

FLEXITALLIC 43
8
(1160)

5
(980)

6-9

a traditional hemp packing,

heavily greased

30

120
(248)

FLEXITALLIC 30
120
(248)

7
(1015)

5
(980)

5-10

cotton packing heavily greased and

graphited

45

VALVE STEM SEALS

25
(3635)

2001

PUMP PACKINGS

virtually all fluids can be handled

with the exception of molten alkali
metals, and strong oxidising agents
such as oleum, aqua regia and fuming
nitric acid.
Non GFO alternative: Flexitallic 900

FLEXITALLIC 45
not recommended for use with strong oxidising agents

* GFO is a trademark of W. L. Gore & Associates Inc.

in general applications; suitable for higher temperature in non-oxidsing media; 650C in steam

** FORTAGLAS is a trademark of TBA Texiles Ltd.

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VALVE STEM SEALS

TYPICAL
USES

GRAPHITE RINGS
& VALVE PACKERS

GR160

ENVIROFLEX
500

ENVIROFLEX 500

TEMP
C
(F)

MAX
PRESSURE
MPa (psi)

550
(1022)

86
(12470)

200/550**
(328/1022)

30
(4350)

MAX SHAFT
SPEED m/s
(fpm)

10
(1970)

pH
LIMITS

TYPICAL
APPLICATIONS

DESCRIPTION

0-14

high integrity valve stem sealing to

reduce fugitive emissions in the
petrochemical and chemical industry

high purity graphite tape formed

into sealing elements of unique
geometry with dissimilar densities;
the specially designed header rings
are braided from graphite filament
yarn

0-14

high temperature, high pressure

valve applications

die-formed rings from 99.85% pure

exfoliated graphite tape; free chloride content less than 50ppm; ash
content 0.1% maximum

COMMENTS

a high performance sealing system,

capable of attaining long term emission levels of less than 100ppm in a
wide range of applications

CONSTRUCTION PRODUCT

FLEXITALLIC
ENVIROFLEX
500

GR163

FLEXITALLIC GR160
-200/300
(-328/572)

30
(4350)

15
(2950)

0-14

high temperature, high pressure

valve applications

die-formed rings from 99.85% min

pure exfoliated graphite, with pockets of PTFE on the inner bore

400
(752)

7
(1015)

15
(2950)

4-10

for all types of equipment including semi-plastic packing constructed of

pumps, agitators and valves hanaramid fibre, high temperature
dling steam, water, mild chemicals, binders and flake graphite
oils and distillates

SS6AR

FLEXITALLIC GR163
approved for use in contact with
potable (drinking) water

FLEXITALLIC SS6AR

306

BRAIDED PACKINGS

200/460
(-328/860)

30
(4350)

2
(395)

0-14

petrochemical, chemical and power

generation industries

high purity exfoliated graphite gland

packing reinforced with inconel wire

FLEXITALLIC 306
21
(3045)

20
(3940)

0-14

power generation, chemical and

petrochemical industries

top quality carbon yarn packing

treated with high performance lubricant, corrosion inhibitors and sacrifical zinc, reinforced with inconel wire
to aid extraction

0-14

chemical, food, pharmaceutical,

oxygen, paint, petrochemical and
brewing industries; recommended
for aggressive chemicals, powerful
oxidants or vacuum/gas sealing

flexible pure PTFE packing

304

-85/430
(-120/806)

FLEXITALLIC 304
14
(2030)

26D

-85/260
(-120/500)

3
(590)

FLEXITALLIC 26D
not recommended for use with strong oxidising agents

** FORTAGLAS is a trademark of TBA Texiles Ltd.

in general applications; suitable for higher temperature in non-oxidsing media; 650C in steam

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STATIC SEALS

TEMP
C
(F)

PRODUCT TYPE
THERMICULITE PACKING

pH
LIMITS

DESCRIPTION

PRODUCT
NAME

1050
(1900)

0-14

Critical service packing made

from expanded vermiculite foil
and Inconel wire

THERMICULITE 894

600
(1112)

5-11

high density packing made from

continous filament E glass yarns

FLEXITALLIC
GP1

600
(1112)

5-11

medium density packing made

from knitted E glass yarns

FLEXITALLIC
GP2

600
(1112)

5-11

low density packing from E

glass yarn

FLEXITALLIC
GP125

1260
(2300)

3-9

packing made from a ceramic

fibre yarn reinforced with inconel
wire

FLEXITALLIC
CFP1

1260
(2300)

3-9

Packing made from a ceramic

yarn reinforced with glass carrier
thread

FLEXITALLIC
CFP2

for high
temperature,
high pressure
sealing

GLASS PACKINGS

for metal
processing, boiler doors, furnace
doors, coal and
wood burning
stove door seals

CERAMIC PACKINGS

for hightemperature
crucible lid and
furnace door
seals

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ENVIROFLEX 500
The Flexitallic answer to fugitive emissions

Investigation of all potential sources of fugitive

emissions from a petrochemical plant (flanges,
pumps, heat exchangers, etc.) has revealed the
majority, estimated to be around 65%, emanate
from the stems of control and isolation valves.
In response, Flexitallic has developed an
ultra-high performance, valve stem sealing system,
Enviroflex 500*.
Enviroflex 500 is a five component system.
Two header rings are braided from high quality
graphite filament yarn, impregnated with a high
temperature blocking agent and a high temperature/
high viscosity lubricant. Between these are
positioned three sealing elements, die-formed from

Where stiction may be anticipated or

very high purity exfoliated graphite.

experienced in control valves, Flexitallic offers

The unique geometry of these sealing elements

Enviroflex 503, a specialist product developed

ensures a much more efficient conversion of

with PTFE pockets on the inside diameter of the

compressive load to sealing stress than is

central olive to further reduce the effects of friction

achievable with traditional square section rings.

on valve operation.

This feature is complemented by the low density

* Results from recent testing at BP chemicals confirm its

construction of the central olive which conforms

superior performance compared with other available valve

easily to the stem surface.

packing systems. (further details on request)

COMPARATIVE PERFORMANCE WITH

ROTARY AND TRANSLATIONAL STEM
MOVEMENT*

PERFORMANCE OF ENVIROFLEX 500 ON

CARBON STEEL CLASS 300 PxT CURVE*

Further testing has been undertaken to compare

across a range of temperatures and pressures,

performance of Enviroflex 500 in conjunction

independent test data was obtained showing

with both modes of stem movement commonly

emission levels of helium after 1000 valve cycles

encountered by a valve packing, i.e. rotational

in conditions replicating points on, or close to, the

and translational. Results of testing up to 5000

PxT curve for a Class 300 carbon steel valve.

cycles are illustrated. The contained medium was

Stem movement was translational.

helium at 200C and 40 bar.

*Data generated at University of Leeds Industrial Services.

To illustrate the performance of Enviroflex 500

600

500
400
300

Translational

200
100

Rotational

Temperature (0C)

Emission Level (ppm)

*Data generated at University of Leeds Industrial Services.

50ppm

500

310ppm

400
300

36ppm

200
100

150ppm

0
0

1,000

2,000

3,000

4,000

Valve Cycles

5,000

10

20

30

40

Pressure (bar)

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50

60

INSTALLATION AND SUPPLY

To ensure long and trouble-free sealing with

PACKING THE GLAND

Flexitallic Compression Packings, check the

following points periodically;

removed and that the stuffing box is clean and

CONDITION OF PLANT

Ensure that all the old packing has been

free from foreign matter.

The clearance between shaft and neckbush at

bottom end of stuffing box. Excessive clearance means greater pressure on bottom pack-

Select the correct size of packing for the

particular shaft/stuffing box dimensions.

Wrap the packing around the shaft (slightly

ing rings and greater chance of packing extru-

more than one turn) or on a round mandrel

sion. Normal clearance 0.25mm (0.010 maxi-

of the specified diameter. Cut both ends

mum).

simultaneously at an angle of 45 to form a

Concentricity of shaft with stuffing box bore.

scarf joint. No gap is left between the ends.

The straightness of shaft (run-out) - should not

exceed 0.05mm (0.002) clock gauge reading.

Using this piece as a template cut the

remainder of the rings to the same length.

Condition of shaft surface in packing area - no

excessive grooves, scores or pitting.

that it is correctly seated (i.e. firmly bedded)

Pump bearings - wear can induce shaft whip

by tamping or by the use of split sleeves in

which is detrimental to packing sealing

conjunction with the gland follower. Stagger

performance.

the joints by 90 or 120.

Fit each packing ring individually and ensure

If a lantern ring is fitted it should be positioned

below the inlet connection, but slightly offset
from the central position to allow for
compression of the bottom packing rings.

When the correct number of rings has been

fitted, allowing for sufficient entry of the gland
follower, check that the shaft still rotates
reasonably freely.

Tighten the gland nuts evenly until the packing

drags when turning the shaft by hand.

Valves - Pressurise the stuffing box and if

necessary re-adjust the gland nuts evenly until
a leak-free seal is obtained.
Pumps - Slacken the gland nuts back after last
stage and re-tighten to finger tight. Ensure
shaft still rotates fairly freely and prime the
pump.

CALCULATION OF PACKING LENGTH (L)

L = 3.3 (d + c) (mm)
PACKING SECTION (c) =

D-d
2

D = stuffing box diameter (mm)

d = shaft or spindle diameter (mm)

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RUNNING - IN
Pumps and rotating equipment
After starting the pump, allow it to run with steady
leakage for the first 15 minutes. Then begin to
adjust the gland nuts equally, one or two flats at a
time, with about 10 minutes between adjustments,
until the leakage is reduced to an acceptable
level. If, during this procedure the gland begins to
overheat, slacken off the gland nuts slightly to
increase the leakage rate, thus reducing the gland
temperature. Commence re-tightening again after
a further 5-10 minutes.
N.B. - Some leakage from the gland should always be

PACKAGING

maintained (approx. 10 drops/minute) to ensure adequate

Valve and pump packings are supplied on flanged

lubrication and cool running of the packing.

spools and individually boxed. The label indicates

Valves

product number, size and maximum operating

Valve packings do not need to be run-in, but

parameters. The standard coil length for sizes

after the first hour or two at full temperature and

below 6mm is 20m; for 6mm and over, the

pressure it is advisable to re-tighten the gland

standard length is 8m.

Bulk coils and non standard coil lengths are

follower to compensate for the initial slight loss

of lubricant and bedding in of the packing.

available on request.
Dry Glass Packings are supplied in coils
as below.

5mm and below

200m

6.5 and 8mm

100m

9.5mm

60m

12.5, 14 and 16mm

30m

18, 20, 22mm

15m

25mm

10m

EX-STOCK
AVAILABILITY

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Ammonia
Amyl Acetate
Amyl Alcohol
Aniline
Aqua-Regia
Aviation Fuel
Beer
Benzene
Benzoyl Chloride
Biphenyl
Blast Furnace Gas
Bleach (Solution)
Boiler Feed Water
Brine
Bromine
n-Butyl Acetate
Calcium Chlorate
Caprolactam
Carbolic Acid
Carbon Dioxide
Carbon Disulphide
Carbon Monoxide
Carbon Tetrachloride
Chile Saltpetre
Chlorine Dry
Chlorine Wet
Chlorinated Hydrocarbons

Chloroacetic Acid
Chlorobenzene
Chromic Acid
Copper Sulphate
Creosote
Cresol
Crude Oil
Cyclohexanol
1,4 Dichlorobenzene
Diesel Oil
Dowtherm
Dye Liquor

Oxygen

"
"
Pentachlorophenol
!
Perchloric Acid
!
Petrol
"
Phenol
!
Phosgene
"
Phosphoric Acid (Conc) !
Phosphoric Acid (Dil)
O
Phosphorous
!
Phthalic Anhydride
"
Potassium Hydroxide
O
Potassium Nitrate
"
Potassium Permanganate O
Producer Gas
"
Pyridine
"
Rape Seed Oil
"
Silicone Oil
"
Soda Ash
"
Sodium Bicarbonate
"
Sodium Carbonate
"
Sodium Cyanide
"
Sodium Hydroxide (90%) !
Sodium Hydroxide (Dil)
O
Sodium Hypochlorite
"
Sodium Nitrate
"
Starch
"
Steam
O
Steam Condensate
"
Styrene
"
Sulphur
"
Sulphur Dioxide
!
Sulphur Trioxide
!
Sulphuric Acid (Conc)
!
Sulphuric Acid (Fuming) !
Tar
"
Turpentine
"
Toluene
"
Towns Gas
"
Transformer Oil
"
Tributyl Phosphate
"
Triethanolamine
"
Urea
"
Vegetable Oil
"
Vinyl Acetate
"
Vinyl Chloride
"
Vinylidene Chloride
"
Water
"
Water Condensate
"
Water Distilled
"
Whisky
"
Wine
"
White Spirit
"
Xylene
"
Paraffin

GRAPHITE
LOADED PTFE

ARAMID

"
"
"
O
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ACRYLIC

Ammonia Gas

!
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O
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!
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VEGETABLE

Aluminium Chloride

!
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!
!
O
!
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!
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!
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PTFE
GLASS
GRAPHITE

Alkaline Lye

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ACRYLIC

Air

ACRYLIC

Acrylonitrile

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!
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O
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VEGETABLE

Acrylic Acid

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O
O
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O
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O
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O

PTFE
GLASS
GRAPHITE

Acetylene

GRAPHITE
LOADED PTFE

Acetone

ARAMID
Acetic Acid Glacial

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VEGETABLE

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Ethylene Glycol
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Ethylene Oxide
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Ethyl Ether
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Ethylene
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Ethylene Chloride
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Fatty Acids
"
Ferric Chloride
"
Fluorine
!
Fluorosilicic Acid
"
Formaldehyde
"
Formic Acid (85%)
O
Formic Acid (10%)
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Gas Oil
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Gasoline
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Glucose
"
Heating Oil
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Hydraulic Oil (Glycol)
"
Hydraulic Oil (Mineral) "
Hydraulic Oil (Ester)
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Hydrazine
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Hydrocarbons (Aromatic) "
Hydrocarbons (Aliphatic S) "
Hydrocarbons (Aliphatic U) "
Hydrochloric Acid (37%) !
Hydrofluoric Acid
!
Hydrogen
"
Hydrogen Chloride
!
Hydrogen Fluoride
!
Hydrogen Peroxide
!
Hydrogen Sulphide
!
Isopropyl Acetate
"
Isopropyl Alcohol
"
Kerosene
"
Lime (Quick)
"
Lubricating Oil
"
Machine Oil
"
Magnesium Sulphate
"
Malic Acid
"
Methane
"
Methyl Acrylate
"
Methyl Alcohol
"
Methyl Isobutyl Ketone "
Methyl Methacrylate
"
Methylene Chloride
!
Mineral Oil
"
Mobiltherm
"
Naphthalene
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Natural Gas
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Nitric Acid (50%)
!
Nitric Acid (95%)
!
Nitrogen
"
Oleum
!
Ethyl Alcohol

PTFE
GLASS
GRAPHITE

Ethyl Acetate

GRAPHITE
LOADED PTFE

ARAMID

APPLICATION/
COMPATIBILITY
GUIDE

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O
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O
O
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O
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O
O
O
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O
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O
O
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O
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O
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O
O
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" Suitable O Application Dependent ! Not Suitable

Aramid = 2001, SS6AR
PTFE = 26D, 26L
Graphite = Enviroflex, GR160, GR163, 304, 305,
306
Vegetable
=

30, 43, 45
Glass
= 713L, 774
Graphite Loaded PTFE = 900, 1065
Acrylic = 803

Downloaded from www.flexitallic.eu

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