Arbosil 1071

A one-part, low modulus, fire resisting silicone sealant, which cures on exposure to moisture vapour to form a very elastic silicone rubber. It has good adhesion to concrete, metals, and many other common building substrates.

Recommended for perimeter sealing of fire doors and screens, high movement fire-resistant joints, and fire retardant glazing in conjunction with Arboseal Intumescent Tape. It is not recommended for trafficked floor joints, overpainting, or use against natural stone.

General information

Uniclass 2015

Pr_30_31_76_77 Silicone construction joint sealantsPrimary


L20/820 Sealant joints

P12/390 Sealant

P12/47 Sealant – fire-resisting silicone

Specification data - Silicone construction joint sealants

Product Reference

Arbosil 1071



Arbo Primer 2172

Arbo Primer 2402

Arbo Primer 2650

Arbo Cleaner No.17

Xylene based; not suitable for use with plastics or delicate finishes.

Arbo Cleaner No. 16

Alcohol based.

Standard product features

Specification Compliances:

  • BS EN ISO 11600: 25 LM.
  • German DIN 18540: Class E.
  • German DIN 4102: B1, Part 1.
  • US Federal TT-S-00 1543A: Class A.
  • Tested to BS 476 Part 22: Fire integrity in excess of 4 hours.
  • Reaction to fire performance: See Warrington Fire Research Centre Warres Report No. 122635.

Technical Data:

  • Typical Shore A hardness: 20.
  • Application temperature: +5°C to +50°C.
  • Service temperature: -40°C to +100°C.
  • Skinning time at 20°C and 65% relative humidity: 30 minutes.
  • Cure rate at 20°C and 65% relative humidity: 2 mm per 24 hours.
  • Chemical resistance: Resistant to most dilute acids and alkalis; organic solvents may cause the sealant to swell and lose adhesion, but do not directly dissolve the sealant.
  • UV resistance: Very good.
  • Service life: 25+ years.

Movement accommodation:

  • Butt joints (movement in tension and compression): 50% (Must not exceed ±30% in any one direction).
  • Lap joints (movement in shear): 100% (Must not exceed ±70% in any one direction).


  • White.
  • Special colours made to order.

Joint sizes:

Width: Joints should be as narrow as practicable to prevent passage of fire.

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


  • Minimum: 10 mm.
  • Maximum: 25 mm.

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