A two part, intumescent, polysulphide sealant which, when mixed, cures to form a flexible rubber seal. It has good adhesion to concrete, stone, metals and many other common building substrates.

Designed for sealing expansion joints and other joints in walls or screens where prevention of the passage of fire is required – fire resistance in excess of 4 hours has been achieved.

Not recommended for floor joints.

General information

Uniclass 2015

Pr_30_31_76_62 Polysulfide construction joint sealantsPrimary


P12/49 Sealant – fire-resisting polysulfide

Specification data - Polysulfide construction joint sealants

Product Reference

Arbokol 476



AG2 Porous Primer

AG2 Non-porous Primer

Arbo Cleaner No.17

Toluene based, not suitable for use with plastics or delicate finishes.

Arbo Cleaner No.16

Alcohol based.

Standard product features

Specification Compliances:

  • Warrington Fire Research Centre: Warres Report No: 116996.
  • Warrington Fire Research Centre: Warres Report No: 116997.
  • Warrington Fire Research Centre: Warres Report No: 119344.

Technical Data:

  • Typical Shore A hardness: 25.
  • Working life: 1 hour at 20°C.
  • Application temperature: +5°C to + 40°C
  • Service temperature: -40°C to +90°C. Intumesces at temperatures above 140°C.
  • Cure rate: 7 days at 20°C in a typical 10 mm x 10 mm joint. At colder temperatures the cure rate will be extended.
  • UV resistance: Good.
  • Service life: 20+ years.

Movement accommodation:

  • Butt joints (movement in tension and compression): 25%.
  • Lap joints (movement in shear): 50%.


  • Grey.

Joint sizes:


  • Minimum: 6 mm.
  • Maximum: 25 mm, single application. For multiple applications contact Adshead Ratcliffe Technical Services.


  • Minimum: 12 mm.
  • Maximum: 25 mm.

Width:Depth ratio (within above minimum/ maximum restrictions):

  • Contact Adshead Ratcliffe Technical Services. In general, joints should be as narrow as possible to prevent passage of fire.


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