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SP925
Air Seal

SP925 is a one-component, low-viscosity sealant based on hybrid polymer technologies. It is chemically neutral, low odour and is compatible with most common building substrates. SP925 cures by reacting with the moisture in the air to form a firm, elastic, weather and airtight coating with good UV resistance.

Usage/Purpose

SP925 is a sealant specifically developed to provide weather and airtightness in areas difficult to seal with conventional sealants. By being brushable and sprayable, complex small joints can be successfully sealed. Easy to apply, SP925 does not drop out of vertical unbacked joints up to 6 mm wide. For larger gaps backing is required.

SP925 cures by reacting with the moisture in the air to form a firm, elastic, weather and airtight coating with good UV resistance. Due to its high elasticity SP925 is ideal for sealing small joints where movement is likely to occur. SP925 has excellent adhesion, even on slightly damp surfaces.

  • Easy sealing of complex small joints
  • Very easy to handle
  • Brushable and sprayable
  • Permanently elastic
  • Fast curing
  • Solvent, isocyanate and silicone free
  • Can be applied to damp substrates

Technical data

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CharacteristicTest MethodResult
Material Based on hybrid polymer
Cure Moisture
DensityDIN 52 451-A1.3 g/cm³
Shore A Hardness DIN 53505 30 
Skinning ~20 min. (+ 23°C / 50% RH)
Tack Free  20-30 min. (+ 23°C / 50% RH)
Curing ~2 mm / 1st day (+ 23°C / 50% RH)
ShrinkageDIN EN ISO 1056~3%
Modulus of Elasticity 100%DIN EN ISO 8339~0.6 N/mm²
Elasticity ift Guideline MO-01/1 (10 mm wide joint)+/- 3.0 mm expansion/compression; +/-11.2 mm transverse shear; +/8.0 mm longitudinal shear
Resistance to Alternating Mechanical Load ift Guideline MO-01/1 (10 mm wide joint)3000 cycles fulfilled
Water Vapour Permeability ift Guideline MO-01/1 sd value 1.8 m (1.4 mm film thickness)
Air Tightnessift Guideline MO-01/1 (perimeter seal to window)< 0.1m³/ [m hr (daPa)²/³
Weather Tightnessift Guideline MO-01/1 (perimeter seal to window)600 Pa
Water Vapour Resistance Factor (µ) ift Guideline MO-01/11277

Tensile Strength

DIN 53504 S2

DIN EN ISO 8339 (Method A)

~2.1 N/mm²

~1.3 N/mm²

Elongation at Break 

DIN 53504 S2

DIN EN ISO 8339 (Method A)

~340%

~360%

Elastic RecoveryDIN EN ISO 738975%
ConsistencyEN 27390 [10 mm] No sag
Temperature Resistance  -40°C to +90°C
Application Temperature  +5°C to +40°C
Storage Store in shaded, dry conditions between +5°C and +25°C 
Shelf Life 12 months when stored as recommended in original unopened packaging
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