MONOKOTE® MK-6/HY Extended Set fireproofing is a single component, mill-mixed fireproofing plaster (cementitious) which has a delayed set feature. Extended Set is the same as MK-6/HY, except this product can be left unattended in the delivery system for up to 4 days. The Extended Set product requires the addition of water to form a consistent, pumpable slurry. To achieve proper setting time, MONOKOTE® Accelerator must be injected into MONOKOTE® MK-6/HY Extended Set fireproofing during product application. In addition, a dye marker material should be added when Extended Set is introduced per mixing and application instructions. This product can be used on structural steel columns, beams, joists, trusses, floors and roof decking.
Features & Benefits
MONOKOTE® MK-6/HY Extended Set fireproofing offers the following features and benefits to fireproofing applicators:
|Delayed set time||Allows applicator to significantly reduce or eliminate time consuming pump-in/pump-out procedure
Allows applicator to increase daily productivity rate (bags/day) up to 20%
Allows applicator to reduce waste water disposal and material scrap
Allows applicator to complete fireproofing jobs in less time
|Same in-place performance and fire rating performance as MK-6/HY||Durable
UL listed (MK-6/HY)
Factory inspected to ensure product performance
Compliance with UBC, NBC, SBC and IBC Building Codes
|Superior technical service & support||Provides application training and support
Provides timely troubleshooting and follow up service
Delivery & Storage
- All material to be used for fireproofing shall be delivered in original unopened packages bearing the name of the manufacturer, the brand and proper Underwriters Laboratories Inc. labels for fire hazard and fire-resistance classifications.
- The material shall be kept dry until ready for use. Packages of material shall be kept off of the ground, under cover and away from sweating walls and 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
- Prior to the application of Extended Set, an inspection shall be made to determine that all steel surfaces are acceptable to receive fireproofing. The steel to be fireproofed shall be free of oil, grease, excess 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.
- The project architect shall determine if the painted or primed structural steel to receive fireproofing has been tested in accordance with ASTM E119, to provide the required fireresistance rating.
- 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 GCP sales representative for details.
- Prior to application of Extended Set, a bonding agent approved by the fireproofing manufacturer shall be applied to all concrete substrates.
- Apply fireproofing to the underside of roof deck assemblies only after roofing application is complete and roof traffic has ceased.
- No fireproofing shall be applied prior to completion of concrete work on steel decking.
|Physical Properties||Recommended Specification||Typical Values||Test Method|
|Dry density, minimum average||15 pcf (240 kg/m3)||15 pcf (240 kg/m3)||ASTM E605|
|Bond strength||200 psf (9.6 KPa)||339 psf (16.2 KPa)||ASTM E736|
|Compression, 10% deformation||1,200 psf (51 KPa)||1,483 psf (71.0 KPa)||ASTM E761|
|Air erosion||Max 0.000 g/ft2 (0.00 g/m2)||0.000 g/ft2 (0.00 g/m2)||ASTM E859|
|High velocity air erosion||No continued erosion after 4 hours||No continued erosion after 4 hours||ASTM E859|
|Corrosion||Does not contribute to corrosion||Does not contribute to corrosion||ASTM E937|
|Bond impact||No cracking, spalling or delamination||No cracking, spalling or delamination||ASTM E760|
|Deflection||No cracking, spalling or delamination||No cracking, spalling or delamination||ASTM E759|
|Resistance to mold growth||No growth after 28 days||No growth after 28 days||ASTM G21|
|Surface burning characteristics||Flame spread = 0
Smoke developed = 0
|Flame spread = 0
Smoke developed = 0
|Combustibility||Less than 5 MJ/m2 total, 20 kw/m2 peak heat release||Less than 5 MJ/m2 total, 20 kw/m2 peak heat release||ASTM E1354|
|Impact penetration||Max 6 cm3 abraded||3.9 cm3||City of San Francisco|
|Abrasion resistance||Max 15 cm3 abraded||8.3 cm3||City of San Francisco|
Temperature & Ventilation
- The substrate temperature shall be a minimum of 40°F (4.5°C) for at least 1-hour prior to the application of the MONOKOTE®. Additionally, the air and substrate temperature during application and for a minimum or 24 hours after application shall be no less than 40°F (4.5°C).
- 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 air exchange rate of 4 times per hour until the material is substantially dry.
- 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 the applicable building code.
- The architect will select and the owner will pay for an independent testing laboratory to randomly sample and verify the bond strength of the fireproofing in accordance with the provisions of ASTM E736.
- 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 pre-job conference.
- MONOKOTE® Extended Set 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.
- Safety Data Sheets (SDS) for MONOKOTE® MK-6/HY Extended Set are available upon request by calling 866-333-3SBM (3726) or by visiting our web site.
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This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.
Last Updated: 2023-06-28