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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With excellent dispersing and wetting properties, naphthalene sulfonates have been a workhorse of the building chemistry industry. Bisley exclusively market the BISPLAS range of naphthalene sulfonates, available as both a calcium and sodium salt, with a variety of sulfate grades available. Formaldehyde free grades are also available.
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.
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.
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.
Extremaspheres™ are expanded foam glass spheres ideally suited for light colour and light weight renders, mortars and concrete. Extremaspheres™ are a lightweight aggregate made from recycled glass, chemically resistant, low in density, resistant to pressure and act as a thermal insulation, acoustic absorption. Highly suited for use in insulation, fireproof renders and cement board.
Microspheres, also known as cenospheres, are thin walled hollow ceramic spheres that can be used to modify rheology, reduce weight and shrinkage and improve thermal insulation. With high crush strength, suitable for all light weight mortar and render applications. Bisley supplies a range of microspheres known as Biscil.
Cellulose ethers extend the open time / workability of mortars and glues. With extremely low addition rates, cellulose ethers can modify the flow properties of the cement mortar water retention, making water available to the slurry over time. Bisley supplies a full range of MCs, HECs and HPMCs.
E-Glass chopped strand fiber is composed of a calcium aluminoborosilicate glass and is widely used as an additive to reinforce composite materials such as gypsum and fiber glass composites. Its high temperature stability makes it useful in fire resistance materials. Bisley supplies 6mm and 12 mm fine chopped E-glass fiber, other fiber sizes may be available upon request.