NBS Source
Arbomast GP

Application

Suitable for use in perimeter sealing of timber frames and sealing of preformed concrete panels, e.g. for garages.

Description

An oil-based, general-purpose mastic.


Features and benefits:

  • Not recommended for high movement joints or expansion joints.
  • Resistant to dilute alkalis and acids.
  • Should not cause staining on many common building materials, but may stain porous materials such as marble, slate and other natural and reconstituted stones.
  • Flash point: 65°C.
  • Good UV resistance but may undergo slight yellowing.
  • Available in four standard colours.
  • Can be painted, but excessive movement will cause the paint to crack. Bituminous paints should not be used.
  • Correctly applied, the sealant should not require maintenance, and has an anticipated life in excess of 10 years.
  • Health and safety: Avoid prolonged skin contact. Use of this product should be recorded in the Project Health and Safety Plan.

General information

Color

Grey

White

Other

Material

Mastic

Shape

Formless

Uniclass

Pr_30_31_76_58 Oil-based mastic joint sealantsPrimary

CAWS

H42/661 Sealant joints

L10/75 Sealant joints

L10/810 Sealant joints

L20/80 Sealant joints

L20/820 Sealant joints

Product range

Mastic Sealants

Specification data - Oil-based mastic joint sealants Enhanced data

Sealant type

Oil based.

Colour

Grey.

Natural.

Teak.

White.

Accessories

None.

Filler: Closed cell foam polyethylene rod.

Filler: Fibre-board with bond breaker tape.

Primer: Arbo Primer 925.

Application temperature

+5 to +50°C.

Cure time

Skins after approximately 14 days depending on atmospheric conditions.

Joint width

6 mm (minimum single application); 18 mm (maximum single application).

 Joint depth:

  • Porous substrates: 10 mm (minimum); 20 mm (maximum).
  • Non-porous substrates: 6 mm (minimum); 20 mm (maximum).


Backing

A combined joint filler/ bond breaker, such as closed cell foam polyethylene rod, should always be used to ensure that the sealant adheres only to the joint faces and not to the back.

Bond breaker tape should be used where the joint has been packed out with fibre-board.

Primer

Friable or brittle surfaces will need priming with Arbo Primer 925.