RAW MATERIALS RANGE GUIDE
Raw Materials for Drywall and Gypsum Putty
Bisley have been suppliers to the drywall/plasterboard industry for over three decades, offering a range of dispersants / wetting agents, accelerators, air-entrainers, de-foamers, retarders and specialty additives for gypsum putty.
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Dispersants/ Wetting Agents
Bisley carries a range of powder additives for air-entrainment and foam generation. Foaming agents can play a major role in reducing the density of the drywall (gypsum board), which allows for ease of handling, thermal insulation, sound proofing, shorter drying times and savings in raw material costs.
Modified starches are effective thixotropic agents which impart anti-sag properties, improving cohesion of the gypsum matrix. Modified starches are suitable for use in renders, tile adhesives and gypsum putties. Bisley supply tapioca and maize derived starches, others are available upon enquiry.
Plaster mixtures containing STMP can improve compressive strengths of the boards as well as mechanical stability. STMP has been shown to have an excellent effect on reducing sag deflection. STMP does not have the effect of retarding the setting, meaning it does not increase the re-conversion rate of calcined plaster into calcium sulfate dihydrate.