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Chemical Resistance Machining and Welding Methods Chemical resistance Polystone® GP Polystone® GP Acetaldehyde + / Glycerine + + Acetic acid + + Hydrochloric acid + + Acetone + + Hydrogen peroxide 30 + 30 + Acrylonitrile + + Hydrogen sulphide + + Allyl alcohol 96 + 96 + Lactic acid + + Aluminum chloride A+ A+ Magnesium chloride A+ A+ Ammonia A+ A+ Mercury + + Ammonium chloride A+ A+ Methanol + + Aniline + + Methyl ethyl ketone + + Benzaldehyde + + Methylene chloride / / Benzene / / Mineral oil + + Benzyl alcohol + + Motor oil + + Bleach (Chlorine) – – Nitric acid 50 / 50 / Boric acid A+ A+ Nitrobenzene + + Butanol + + Oleic acid + + Butyl acetate + / Ozone / / Calcium chloride + + Perchloric acid 50 + 20 + Carbon disulphide / / Petroleum + + Carbon tetrachloride /M– – Phenol + + Chlorine gas / – Phosphoric acid + + Chlorobenzene / / Potassium chromate 40 + 40 + Chloroform /M– /M– Potassium hydroxide 30 + 30 + Chromic acid 10 + 10 + Potassium nitrate A+ A+ Citric acid + + Potassium permanganate + + Cyclohexanol + + Pyridine + / Cyclohexanone + + Sea water + + Dekalin + Sodium carbonate A+ A+ Dibutyl phthalate + + Sodium chloride 50 + 50 + Diesel fuel + + Sodium hydroxide A+ A+ Diethyl ether + to / / Sulphuric acid 80 + 80 + Dioxane + / Tallow + + Ethanol 96 + 96 + Tetrahydrofurane + to – / Ethyl acetate + + Tetralin + – Ethylene chloride / / Thionyl chloride – – Ethylene diamine + + Toluene / / Ferric chloride A+ A+ Transformer oil + + Fluorine – – Trichlorethylene + to – / Formaldehyde 40 + 40 + Urea, aqueous 33 + 33 + Formic acid + + Water + + Furfurol + Zinc chloride A+ A+ Values obtained at room temperature. Call for high or low temperature applications. Number indicates concentration if < 100 %. M = Values may change under mechanical stress. A = Aqueous solution. + = Specimen is resistant ......................Swelling < 3 % or weight loss < 0.5 %. Break elongation not significantly altered. / = Specimen has limited resistance ........Swelling 3-8 % or weight loss 0.5-5 % and/or break elongation decreased by < 50 %. – = Specimen is not resistant ................Swelling > 8 % or weight loss > 5 % and/or break elongation decreased by > 50 %. Recommended Machining and Welding Conditions Polystone® GandPcanbeefficientlymachinedwithall known tools used in wood and metal processing. Sawing Fast-running circular and band saws are suitable. Smooth surfaces can be achieved when the teeth are lightly set. Saw blades with teeth more than 5/8" apart are sug- gested. Especially with PP, fast chip removal is essential to prevent melting. Milling Fairly high feed rates and revolutions work best with atten- tion to reduce heat generation. Suggested 9,000-12,000 rpm with a feed rate of 250-350 inches per minute. Welding Quality welds are achieved with the appropriate tempera- ture setting and air pressure. The welding rod must be compatible, and along with the joint surfaces, both should be clean before starting. Thermoforming A controllable heating system is required that is designed to provide even heat to each point of the sheet. Typical heat time is 10 minutes per 1/8" sheet thickness. Polystone® G (HDPE) Extrusion welding melt temperature: 395 ̊F - 440 ̊ F Hot gas welding temperature: 608 ̊F Thermoforming temperature range: 285 ̊F - 300 ̊F Polystone® P (Polypropylene) Extrusion welding melt temperature: 410 ̊F - 460 ̊ F Hot gas welding temperature: 590 ̊F Thermoforming temperature range: 320 ̊F - 350 ̊F Polystone® sheets are easily cut and welded Seams are routered to leave a smooth, clean jointPDF Image | Polystone G(HDPE)
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