Technical data

Technical data 

Mixing ratio (1:2) | 1 part A1 Liquid / 2 parts A1 Powder
Colour | creamy white (*1), non-transparent
Density (wet) | 1.75 kg / dm³
Density (dry) | 1.66 kg / dm³
Processing time | 20-25 minutes
Demoulding time | approx. 1 hour
Hardness | 80º Shore D
Expansion during hardening | 0.1 – 0.6%

(*1) The colour of A1 can vary slightly with every production batch.


• Very high fire resistance properties
• UV stabilised
• Rainwater resistant (if sealed)
• Good mechanical properties
• Low heat generation during curing
• Shrink free
• Solvent-free
• Low peak exotherm
• Working time can be extended by 20-25 minutes


During curing A1 will expanded between 0,1% ad 0,6%. The biggest advantage of this expansion is that A1 will make a perfect copy of the mould you are using by copying every (tiny) detail. This is the reason why A1 will feel and look like the original. When using a polyester, metal or another stiff material mould be aware that this needs to be self-releasing. For A1 objects that need to be dimensionally stable use high shore silicone moulds or stiff material moulds.

Peak temperature
The peak temperature of A1 during curing is about 40°C – 45°C. Even for larger volumes of A1 this temperature will be in the same range.

Not food approved
We do not have a food approval certificate for A1.

A1 has a creamy white colour after curing and is non-transparent.

Test values for mechanical properties
For the determination of the mechanical performance of A1 composite laminate panels have been made by hand lay-up of glass fibre reinforcement (Triaxial Fibre 300, 160 g/m²) with A1 mixture.

For more information see our report:
Design Guide A1 structures