Arbosil HM

One part, high modulus, acetoxy cure silicone sealant which cures rapidly, on exposure to moisture vapour, to form a resilient elastic silicone rubber.

Can be used for sealing aluminium sheets and components.

Contains a fungicide to help reduce mould growth.

Not recommended for overpainting, or use against metal surfaces or natural stone.

Health and safety:

Avoid prolonged skin contact.

General information

Uniclass 2015

Pr_30_31_76_77 Silicone construction joint sealantsPrimary


H20/150 Sheet cladding

H20/155 Sheet cladding

H32/120 Plastics

P12/390 Sealant

P12/47 Sealant – fire-resisting silicone

Specification data - Silicone construction joint sealants

Product Reference

Arbosil HM









Arbo primer 2650

Arbo primer 2402

Arbo primer 2172

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 F/G 25HM.

Technical data:

  • Typical Shore A hardness: 20.
  • Application temperature: +5°C to +50°C.
  • Service temperature: -50°C to +150°C.
  • Skinning time at 20°C and 65% relative humidity: 10 minutes.
  • Cure time at 20°C and 65% relative humidity: 2 mm per 24 hours.
  • Chemical resistance: Resistant to most alkalis and dilute acids. 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): 25%. Movement not to exceed ± 20% in any one direction.
  • Lap joints (movement in shear): 50%. Movement not to exceed ± 40% in any one direction.

Joint sizes:


  • Minimum: 6 mm.
  • Maximum: 25 mm (single application); 35 mm (multiple applications).


  • Minimum: 10 mm on porous substrates; 6 mm on non-porous substrates.
  • Maximum: 15 mm.

Width:depth ratio (within the above minimum/ maximum restrictions):

  • Butt joints: 2:1.
  • Lap or floor joints: 1:1.

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