VST Foamed Acrylic Tapes Distributed in Canada by All-Tape Solutions VST foamed acrylic tapes – an introduction VST foamed acrylic tapes are formulated from acrylic copolymers and monomers to produce a self adhesive visco-elastic foam, which is a high density, closed cell foam, cured by using U.V. light. There are no solvents used in the manufacturing process. The foam is produced by coating on a ‘knife over roller’ coating head. VST Foam Tapes form permanent bonds to a wide variety of high surface energy substrates under extreme environmental conditions. VST tape thickness ranges between 0.25mm (10mil) and 3mm (120mil). VST acrylic foams are available in White, Grey and Clear versions. VST white and grey foam versions have glass micro-spheres as a filler giving exceptional cohesive strength to the foam. VST foam density of white and grey versions is approximately 800kg/m3 (1348 lb/yd3), and the clear version is 1000kg/m3 (1686 lb/yd3). VST tolerances on the thickness of the foams is +/- 50 micron. VST liners are 135 micron red polyethylene or 120 gsm white PE coated paper. VST tape - construction characteristics VST release paper or red PE film liner VST viscoelastic core section with 100% closed cell structure VST pressure-sensitive surfaces Approvals Hi-Bond Tapes Ltd - 6 Series grey acrylic foam tapes in thicknesses from 0.8mm to 2mm thick are approved with Underwriters Laboratory to UL 746C for polymeric materials. For use in the electronics and allied industries. Testing was conducted on the following substrates: Glass, Aluminium, Tedlar™ , Galvanised Steel, Polycarbonates and PPE. VST tape variations PRODUCT CODE COLOUR THICKNESS (mm / inch) FOAM DENSITY (Kg/m3) LINER TYPE LOG DIMENSIONS (mm x M) VST4040W WHITE 0.40 (16mil) 850 Film 400 x 33 VST4064W WHITE 0.64 (25mil) 850 Film 400 x 33 VST4110W WHITE 1.10 (45mil) 850 Film/Paper 400 x 33 VST4200W WHITE 2.00 (80mil) 850 Film 400 x 16.5 VST4025C CLEAR 0.25 (10mil) 1000 Film 400 x 66 VST4050C CLEAR 0.50 (60mil) 1000 Film/Paper 400 x 33 VST4100C CLEAR 1.00 (40mil) 1000 Film/Paper 400 x 33 VST4150C CLEAR 1.50 (60mil) 1000 Film 400 x 25 VST4200C CLEAR 2.00 (80mil) 1000 Film 400 x 16.5 VST4040G GREY 0.40 (16mil) 850 Film 400 x 33 VST4064G GREY 0.64 (25mil) 850 Film 400 x 33 VST4080G GREY 0.80 (32mil) 850 Film 400 x 33 VST4110G GREY 1.10 (45mil) 850 Film 400 x 33 VST4150G GREY 1.50 (60mil) 850 Film 400 x 25 VST5064W WHITE 0.64 (25mil) 850 Film 400 x 33 VST5110W WHITE 1.10 (45mil) 850 Film/Paper 400 x 33 VST tape variations.. cont’d PRODUCT CODE COLOUR THICKNESS (mm/inch) FOAM DENSITY (Kg/m3) LINER TYPE LOG DIMENSIONS (mm x m) VST6040G GREY 0.40 (16mil) 780 Film/Paper 400 x 33* VST6064G GREY 0.64 (25mil) 780 Film 400 x 33* VST6080G GREY 0.80 (32mil) 780 Film/Paper 400 x 33* VST6110G GREY 1.10 (45mil) 780 Film/Paper 400 x 33* VST6150G GREY 1.50 (60mil) 780 Film/Paper 400 x 25* VST6200G GREY 2.00 (80mil) 780 Film 400 x 16.5* VST6025B BLACK 0.25 (10mil) 780 Film 400 x 66* VST3040G GREY 0.40 (16mil) 780 Film 400 x 33* VST3120G GREY 1.20 (47mil) 780 Film 400 x 33* VST3200G GREY 2.00 (80mil) 780 Film 400 x 16.5* VST7025W WHITE 0.25 (10mil) 1500 Paper 400 x 66 VST7064W WHITE 0.64 (25mil) 1500 Film 400 x 33 VST7120W WHITE 1.20 (47mil) 1500 Film 400 x 33 VST6064WFR WHITE 0.64 (25mil) 1500 Film 400 x 33 VST6110WFR WHITE 1.10 (45mil) 1500 Film 400 x 33 VST Laminated Safety Glass • Traditional manufacturing methods use PVB Film (POLYVINYL BUTYRAL) between two sheets of glass. Glass sheets are then autoclaved at high temperature and pressure. • Main Disadvantage: High cost of capital equipment: Autoclave Machine • Liquid resin is the alternative; injected in between two sheets of glass that are bonded together with transparent V.S.T. The resin is either U.V. cured or it is cured at room temperature, dependent on formulation. • Main Advantage: Small investment required to start manufacturing VST Application Method for Laminated Glass • A narrow strip of clear V.S.T is applied around the edge of a sheet of glass. 6mm (1/4 in) is normally the width of the tape. Two sheets of glass are bonded together leaving a small gap. • The gap allows for the resin to be injected and the air between the sheets of glass to escape. • The thickness of the tape used determines the overall thickness of the glass laminate, the overall thickness of the resin and the amount of resin used. • The tape acts as a seal and as a dam as the resin is injected. Different resins have different curing systems. VST Glass Manufacturing Advantages • V.S.T. Provides a Perfect Seal - Resins can sometimes shrink drawing air through the tape bond giving bubbles in the resin. • High Adhesion Level of V.S.T. - Reduces blow-outs where the resin pressure undermines the tape bond, which results in the materials used in the manufacturing process to be wasted. • No Trimming of Glass - Reducing wastage of materials and giving a reduction in manufacturing time.