Grace Fireproofing Products
MONOKOTE MK-6 , MK-6/HY and MK-6s
Product data and application instructions
Product Description
Monokote MK-6 /HY and MK-6s are single
component, spray applied, mill-mixed fire resistive
plasters. MK-6/HY and MK-6s have approval for use
on structural steel members and fluted decking to
provide up to four hours of fire protection, and on
flat plate cellular decking for up to three hours with
Spatterkote SK-3.
Note: Monokote MK-6/HY and MK-6s afford the
same level of the fire protection at identical protection thicknesses. By simply specifying Monokote
MK-6, the fireproofing subcontractor can select the
product that will provide the most efficient fire
protection for the specific project conditions.
Features & Benefits
Monokote cementitious fireproofing offers many
significant advantages to the architect, owner, applicator and building occupant. These include:
Proven in-place performance
Low in-place cost
Fast, efficient application
UL fire tested and factory inspected
Building Code compliant
(ICBO, SBCCI, BOCA, ICC)
Delivery & Storage
a. All material to be used for fireproofing shall be
delivered in original unopened packages bearing
the name of the manufacturer, the brand and
proper UL labels for fire hazard and fire resistance
classifications.
b. The material shall be kept dry until ready for use.
Packages of material shall be kept off the ground,
under cover and away from sweating walls and
Performance Characteristics
Physical Properties
Dry density, minimum average
Bond strength
Compression, 10% deformation
Air erosion
High velocity air erosion
Corrosion
Bond impact
Deflection
Resistance to mold growth
Surface burning characteristics
Combustibility
Impact penetration
Abrasion resistance
other damp surfaces. All bags that have been
exposed to water before use shall be discarded.
Stock of material is to be rotated and used before
its expiration date.
Steel & Concrete Surfaces
a. Prior to the application of Monokote MK-6, an
inspection shall be made to determine that all steel
surfaces are acceptable to receive fireproofing. The
steel shall be free of oil, grease, rolling compounds
or lubricants, loose mill scale, excess rust,
noncompatible primer, lock down agent or any
other substance that will impair proper adhesion.
Where necessary, the cleaning of steel surfaces to
receive fireproofing shall be the responsibility of
the general contractor.
b. The project architect shall determine if the
painted/primed structural steel to receive fireproofing has been tested in accordance with ASTM
E119, to provide the required fire resistance rating.
c. Many Fire Resistance Designs allow the use of
painted metal floor or roof-deck in place of galvanized decking. Painted decking must be UL listed
in the specific fire resistance designs and must
carry the UL classification marking. Consult your
local Grace sales representative for details.
d. Prior to application of Monokote MK-6, a bonding
agent, approved by the fireproofing manufacturer,
shall be applied to all concrete substrates to
receive MK-6.
e. Fireproofing to the underside of roof deck assemblies shall be done only after roofing application is
complete and roof traffic has ceased.
f. No fireproofing shall be applied prior to completion of concrete work on steel decking.
Recommended Specification
15 pcf (240 kg/m3)
200 psf (9.6 KPa)
1,200 psf (51 KPa)
Max 0.000 g/ft2 (0.00 g/m2)
No continued erosion after 4 hours
Does not contribute to corrosion
No cracking, spalling or delamination
No cracking, spalling or delamination
No growth after 28 days
Flame spread = 0
Smoke developed = 0
Less than 5 MJ/m2 total,
20 kw/m2 peak heat release
Max 6 cm3 abraded
Max 15 cm3 abraded
Typical Values
15 pcf (240 kg/m3)
339 psf (16.2 KPa)
1,483 psf (71.0 KPa)
0.000 g/ft2 (0.00 g/m2)
No continued erosion after 4 hours
Does not contribute to corrosion
No cracking, spalling or delamination
No cracking, spalling or delamination
No growth after 28 days
Flame spread = 0
Smoke developed = 0
Less than 5 MJ/m2 total,
20 kw/m2 peak heat release
3.9 cm3
8.3 cm3
Test Method
ASTM E605
ASTM E736
ASTM E761
ASTM E859
ASTM E859
ASTM E937
ASTM E760
ASTM E759
ASTM G21
ASTM E84
ASTM E1354
City of San Francisco
City of San Francisco
g. Other trades shall not install ducts, piping, equipment, or other suspended items until the
fireproofing is completed and inspected.
h. Other trades shall install clips, hangers, support
sleeves, and other attachments that penetrate the
fireproofing, prior to application of the fireproofing.
Mixing
a. Monokote Fireproofing shall be mixed by machine
in a conventional, plaster-type mixer or a continuous mixer specifically modified for cementitious
fireproofing. The mixer shall be kept clean and
free of all previously mixed material. The mixer
speed in a conventional mixer shall be adjusted to
the lowest speed which gives adequate blending of
the material and a mixer density of 4045 pcf
(640720 kg/m3) of material.
b. Using a suitable metering device and a conventional mixer, all water shall be first added to the
mixer as the blades turn. Mixing shall continue
until the mix is lump-free, with a creamy texture.
All material is to be thoroughly wet. Target density
of 43 1 pcf (688 16 kg/m3) is most desirable.
Overmixing Monokote will reduce pumping rate.
Application
a. Application of Monokote Fireproofing can be
made in the following sequence:
1. For thicknesses of approximately 12 in. (13 mm)
or less, apply in one pass.
2. For thicknesses of 58 in. (16 mm) or greater, apply
subsequent passes after the first coat has set.
b. Spatterkote SK-3 shall be applied to all cellular
steel floor units with flat plate on the bottom and
to roof decking where required prior to application
of Monokote. Spatterkote shall be applied in
accordance with manufacturers application
instructions.
c. Monokote Fireproofing material shall not be used
if it contains partially set, frozen or caked material.
d. The minimum average density shall be that
required by the manufacturer, listed in the UL Fire
Resistance Directory for each rating indicated,
ICBO Evaluation Report, as required by the
authority having jurisdiction, or minimum average
15 lbs/ft3 (240 kg/m3), whichever is greater.
e. Monokote shall be mixed with water at the job site.
f. Monokote Accelerator is to be used with
Monokote Fireproofing* to enhance set characteristics and product yield. The Monokote
Accelerator is injected into the Monokote Fireproofing at the spray gun. Monokote Accelerator
shall be mixed and used according to manufacturers recommendations.
www.graceconstruction.com
g. Monokote is applied directly to the steel, at various
rates of application which will be job dependent,
using standard plastering type equipment or
continuous mixer/pump units. A spray gun, with a
properly sized orifice and spray shield and air
pressure at the nozzle of approximately 20 psi
(38 KPa), will provide the correct hangability,
density and appearance. NOTE: If freshly sprayed
Monokote does not adhere properly, it is probably
due to a too wet mix, poor thickness control, or an
improperly cleaned substrate.
Temperature & Ventilation
a. An air and substrate temperature of 40F (4.4C)
minimum shall be maintained for 24 hours prior to
application, during application and for a minimum
of 24 hours after application of Monokote.
b. Provisions shall be made for ventilation to properly
dry the fireproofing after application. In enclosed
areas lacking natural ventilation, air circulation
and ventilation must be provided to achieve a
minimum total fresh air exchange rate of 4 times
per hour until the material is substantially dry.
Field Tests
a. The architect will select an independent testing
laboratory (for which the owner will pay) to
sample and verify the thickness and density of the
fireproofing in accordance with the provisions of
ASTM E605, Standard Test Method for Thickness
and Density of Sprayed Fire-Resistive Material
Applied to Structural Members or Uniform Building Code Standard No. 7-6 Thickness and Density
Determination for Spray Applied Fireproofing.
b. The architect will select an independent testing
laboratory (for which the owner will pay) to
randomly sample and verify the bond strength of
the fireproofing in accordance with the provisions
of ASTM E736.
c. Results of the above tests will be made available to
all parties at the completion of pre-designated
areas which shall have been determined at a prejob conference.
Safety
a. Monokote is slippery when wet. The general
contractor and applicator shall be responsible for
posting appropriate cautionary SLIPPERY WHEN
WET signs. Signs should be posted in all areas in
contact with wet fireproofing material. Anti-slip
surfaces should be used on all working surfaces.
b. Material Safety Data Sheets for Monokote
MK-6/HY and MK-6s are available on our web
site at www.graceconstruction.com or by calling
866-333-3SBM.
* Use of accelerator with MK-6s will provide rapid set but will not
result in yield increase.
For technical assistance call toll free at 866-333-3SBM (3726)
Monokote, MK-6, HY and Spatterkote are registered trademarks of W. R. Grace & Co.Conn.
We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for the users
consideration, investigation and verification, but we do not warrant the results to be obtained. Please read all statements, recommendations or
suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation or suggestion is
intended for any use which would infringe any patent or copyright. W. R. Grace & Co.Conn., 62 Whittemore Avenue, Cambridge, MA 02140.
In Canada, Grace Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.
This product may be covered by patents or patents pending.
MK-515G
Printed in U.S.A.
06/10
Copyright 2010. W. R. Grace & Co.Conn.
FA/PDF
