Arbomeric MP20


A one part, high modulus, modified polymer sealant which cures, on exposure to moisture vapour, to form a tough but elastic rubber.

Recommended for use in many applications, including structural joints in heavy cladding, structural movement joints in floors, and floor joints in heavily trafficked areas.

Not recommended for joints in lightweight cladding and swimming pools.

General information

Specification data - Construction joint sealants

Product Reference

Arbomeric MP20





Standard product features

Specification compliance:

  • BS EN ISO 11600 – F – 25 HM.

Technical Data:

  • Skin time at 20º C and 65% relative humidity: 15 minutes.
  • Application temperature: + 5º C to + 35º C.
  • Service temperature: - 40º C to + 120º C.
  • Typical Shore A hardness: 55.
  • Cure rate at 20º C and 65% relative humidity: 2 mm per 24 hours.
  • UV Resistance: Very good.
  • Service life: 20 years + (when used in trafficked areas the life may be reduced)
  • Chemical resistance: Resistant to most dilute acids and alkalis. Organic solvents may cause the sealant to swell and loose adhesion. Strong cleaning agents can cause surface deterioration and may affect the efficiency of the material.

Movement Accommodation:

  • Butt joints (movement in tension and compression): 35%.
  • Lap joints (movement in shear): 70%.
  • Modulus at 100% extension: 1.12 N/mm².
  • Ultimate elongation: 220%.
  • Tensile strength at break: 1.85 N/mm².

Joint sizes:


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


  • Minimum: 10 mm on porous substrates (12 mm in floor joints); 6 mm on non-porous substrates (12 mm in floor joints).
  • Maximum: 20 mm.

Width: Depth ratio (within above minimum/ maximum restrictions):

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

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