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Firex® 921 MS
Application

  • Public buildings.
  • Sports stadia.
  • Hospitals.
  • Schools.
  • Hotels.
  • Factories and offices.
  • Railway and airport terminals.
  • Off shore structures.
  • Oil terminal Bund walls.
  • Oil terminal floor slabs.

Description

Single part fire rated MS Polymer based sealant designed for sealing expansion joints and compression joints where frequent movement is anticipated as part of a fire resistant assembly. The sealant is formulated to intumesce on exposure to high temperatures to form a fire and smoke resistant joint seal.

It is non-hazardous, will not emit halogenated by products under fire conditions and contains no raw materials known to have an oestrogenic effect in the environment. The sealant offers excellent levels of adhesion to most construction substrates and can be overpainted with oil, polyurethane or latex paints.

Features/ Benefits:

  • Swells at high temperature (250°C) to give a fire and smoke resistant seal.
  • Four hour fire rating.
  • Environmentally friendly.
  • Paintable.
  • High movement accommodation.
  • Resistant to UV Light.
  • Elastomeric intumescent seal.
  • Abrasion resistant including foot traffic.

Applications:

  • Public buildings.
  • Sports stadia.
  • Hospitals.
  • Schools.
  • Hotels.
  • Factories and offices.
  • Railway and airport terminals.
  • Off shore structures.
  • Oil terminal Bund walls.
  • Oil terminal floor slabs.

General information
Uniclass 2015
Pr_30_31_76_16 Construction joint sealantsPrimary
CAWS

F30/610 Movement joints with sealant

F30/670 Head of non-loadbearing walls

H42/661 Sealant joints

H51/610 Sealant jointing

H51/630 Sealant movement/ Other joints

H92/770 General sealants

L10/75 Sealant joints

L10/810 Sealant joints

L20/80 Sealant joints

L20/820 Sealant joints

M40/75 Sealant movement joints

M40/805 Sealant movement joints with metal edgings

M40/815 Sealant movement joints

M41/455 Sealant movement joints with metal edgings

P12/160 Linear gap sealing

Specification data - Construction joint sealants
Product Reference

Firex® 921 MS

Colour

Grey

White

Standard product features

Technical properties:

  • Solids content: 100%.
  • Application temperature: 5–40°C.
  • Service temperature: -40 to +150°C.
  • Skin time: 30–35 minutes (at 23°C and 50% relative humidity).
  • Cure time: 3 mm/24 hours (at 23°C and 50% relative humidity).
  • Hardness: 35 Shore A (approximate).
  • Movement accommodation: 50%.
  • Minimum joint width: 6 mm.

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