Arbosil 1070

A fire resistant silicone sealant suitable for perimeter sealing of fire resisting timber, galvanized or polyester powder coated frames, internally or externally.

In normal service Arbosil 1070 will resist the passage of fire, but will require replacement afterwards.

Not recommended for overpainting, for use with laminated glass or against natural stone.

Resistant to most alkalis and dilute acids; organic solvents may cause the sealant to swell and loose adhesion, but do not directly dissolve the material.

Should not cause migratory staining on porous surfaces, but dirt and dust washed into or around joints by rainwater may cause pattern staining. The sealant itself may discolour in contact with rubbers, bituminous or pitch-based DPCs, etc. Contact with some metals may also cause discolouration.

Very good UV resistance.

Correctly applied, the sealant should not require maintenance, and has an anticipated life in excess of 25 years.

General information

Uniclass 2015

Pr_30_31_76_77 Silicone construction joint sealantsPrimary


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

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Specification data - Silicone construction joint sealants

Product Reference

Arbosil 1070






Joint backing: Mineral wool

Primer: Arbo Primer 2650

Standard product features

Standards and testing:

– BS EN ISO 11600 F/G-25LM.

– Tested to BS 476-20.

– Fire integrity:

  • Single seal: 4 hours integrity; 30 minutes insulation.
  • Double seal: 4 hours integrity and insulation.

Refer to technical literature for details of testing and compliance with other standards.

Health and safety:

Avoid prolonged skin contact. Use of this product should be recorded in the project Health and Safety Plan.

Application temperature:

+5°C to +50°C.

Curing time:

7–14 days, depending on joint configuration and atmospheric conditions.

Joint dimensions:

– Width:

  • Minimum 6 mm; maximum 25 mm (single application; for multiple applications, contact Adshead Ratcliffe Technical Services Department).

– Depth:

  • Minimum 10 mm; maximum 25 mm.

Joint backing:

Where applicable, mineral wool should be used to provide the correct joint depth.


Specify Arbo Primer 2650 for brickwork, concrete and stained timber frames. Primers are available to suit other substrates – refer to technical literature for details.

Product Options


Black and Grey as standard; other colours available to special order.

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