Firex® 321
Application

  • Door and window perimeter pointing.
  • Partition joints.
  • Perimeter pointing to fire wall penetrations.
  • Low movement block work joints.

Description

Single part fire rated acrylic sealant designed for internal perimeter pointing of fire rated door and window frames where the integrity of fire walls or partitions needs to be maintained. The sealant is formulated to intumesce on exposure to high temperatures to form a fire and smoke resistant 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 unprimed adhesion to most construction substrates and can be overpainted.

Features/ Benefits:

  • Swells at high temperature to give a fire and smoke resistant seal.
  • Four hour fire rating.
  • Environmentally friendly.
  • Paintable.

Applications:

  • Door and window perimeter pointing.
  • Partition joints.
  • Perimeter pointing to fire wall penetrations.
  • Low movement block work joints.

General information

Uniclass 2015

Pr_30_31_76_02 Acrylic construction joint sealantsPrimary

CAWS

L10/75 Sealant joints

L10/810 Sealant joints

L20/80 Sealant joints

L20/820 Sealant joints

P12/160 Linear gap sealing

P12/48 Sealant – fire-resisting acrylic

Specification data - Acrylic construction joint sealants

Product Reference

Firex® 321

Colour

Grey

White

Standard product features

Technical properties:

  • Solids content: 100%.
  • Application temperature: 5–40°C.
  • Service temperature: -40 to +120°C when cured.
  • Skin time: 30–45 minutes (at 23°C and 50% relative humidity).
  • Cure time: 2 mm/24 hours (at 23°C and 50% relative humidity).
  • Specific gravity: 1.6.
  • Hardness: 20–25 Shore A.
  • Movement accommodation: 20%.
  • Minimum joint width: 6 mm.

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