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.

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.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-75/345 Silicone construction joint sealants

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Adshead Ratcliffe & Co Ltd


+44 (0)1773 826661

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.

Manufacturer details

Derby Road,
Derbyshire, DE56 1WJ
Tel +44 (0)1773 826661
Fax +44 (0)1773 821215
NBS Plus
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