Acrylic One (A1) is a two-component water based resin system. The components are a powder component based on calcium sulphate and an acrylate-based liquid. After mixing of these components the resin can be processed to make products. The A1 resin does not generate the emission of VOC’s (Volatile Organic Solvents). Typically the time the resin is liquid after mixing of components (pot life) is 20 minutes but can be lengthened by using a retarder or can be shortened by using an accelerator. Additional filler (e.g. sand) can be added to the mixture as well. In the liquid state the resin can be processed in different ways: casting, application on a substrate, spraying and laminating together with reinforcement in a mould. Specially in combination with a glass fibre reinforcement, thin-walled products can be made with a complex shape and with a low weight. Because of the short curing time, short produc- tion times are possible. This enables an efficient production process.
Besides the advantages of A1 of making complex-shaped, light-weight products in an efficient manner, a very important property of A1 is the performance in reaction to fire. This performance has been reported to be B – s1, d0 according to the European standard EN 13501 (report Efectis of 2006) and even A2 – s1, d0 in case the A1 compound is filled with 25% sand (report Efectis of 2017). This is a superior fire performance when compared with composite products that are based on traditional synthetic resins or when compared with wood-based materials.

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