PALSUN Technical Guide

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Technical ManualX. Appendix 1: Chemical Resistance of PALSUN at Room TemperatureThe mechanism of chemical attack on polycarbonate sheets differs significantly from the mechanism of corrosionof metals. Corrosion of metals results in a gradual loss of surface material as a result of electrolytic action by therelevant chemicals. In the cases where chemical attack on polycarbonate sheet occurs, all or a portion of a rangeof effects can be observed. Ethylene choride, chloroform, tetrachloroethane, m-cresol, pyridene and other chemicalscan cause partial dissolution of polycarbonate. Swelling agents include benze, chlorobenzene, tetralin, acetone,ethyl acetate, acetonitrile and carbontetrachloride. Additional effects include color change and/or whitening. Theseeffects may not always lead to product failure, especially for non-loaded sheets. Nevertheless, the level of measuredmechanical properties will be reduced. The most critical effect of chemical attack is stress cracking or crazing, whichmay range in size from being visible to the naked eye to being only observable under a microscope. Stress crackswill always result in sheet failure which will eminate from areas of greatest stress (screws, fixings, bends, etc.)Polycarbonate sheets are generally not recommended for use with acetone, ketones, ethers, and aromatic andchlorinated hydrocarbons in addition to aqueous or alcoholic alkaline solutions, ammonia gas and its solutions andamines.Polycarbonate is resistant to mineral acids, many organic acids, oxidizing and reducing agents, neutral and acid saltsolutions, many greases, waxes and oils, saturated, aliphatic and cycloaliphatic hydrocarbons and alcohols, withthe exception of methol alcohol. The resistance of polycarbonate to water may be described as good up toapproximately 60 °C. At higher temperatures, degradation occurs, the extent of which depends on time andtemperature. Polycarbonate should therefore not be exposed for long periods of time to hot water. However, briefcontact with hot water has no effect. For example, polycarbonate tableware can be washed over 1000 times in adishwashing machine with no adverse effects being observed.The table that appears on the following pages lists the resistance of polycaronate sheet to a number of commonlyencountered chemicals and other corrosive media at room temperature. (Information on chemical resistance athigher temperatures will be supplied upon request). Where the chemical resistance varies with concentration, theresults of tests at different concentrations is presented. The information on chemical resistance is based on ourresearch and experience. (Note that information on compatable adhesives and sealants can be found in aseparate leaflet which will be supplied upon request) It serves as a basis for recommendation. PALRAM Industriesdoes not guarantee chemical resistance unless specific separate documentation is supplied.For chemicals and corrosive media not depicted in the list, please contact your PALRAM representative. He will placeyou in contact with the PALRAM R&D & Technology Department.The table on the following pages uses the following key:R - ResistantLR - Limited Resistance (gradual attack over time may occur)N - Not Resistant (rapid attack or attack over short time period will occur)36
Technical ManualX. Appendix 1: Chemical Resistance of PALSUN at Room Temperature(continued)The chemical resistance of PALSUN & PALTUF sheets, depicted below, has been demonstrated in actual installations and/orlaboratory tests. The information in the table is based on our research and experience. It should be considered solely as a basisfor recommendation, but not as a guarantee, unless specifically stated in separate documentation supplied by PALRAM Industries.Chemical Concentration Resistance 1 Chemical Concentration Resistance 1%*%*AcetaldehydeN BromobenzeneNAcetic Acid10R ButaneRAcetic Acid25 (concentrated) LR (N) ButterRAcetoneN Butyl AcetateNAcrylonitrileN Butyl AlcoholRAcetyleneR Butylene GlycolRAjax (Detergent)R Butyric AcidNAllspiceN Calcium ChlorideSaturatedRAllyl AlcoholLR Calcium HypochloriteRAlum (Aluminum Ammonium Sulfate)R Calcium NitrateRAluminum ChlorideSaturatedR Calcium Soap FatRAluminum OxalateR Calcium SulfateRAluminum SulfateSaturatedR Camphor OilNAmmonia (Gas)N Carbolic AcidNAmmonia (Aqueous)N Carbon Dioxide Gas (Moist)RAmmonium CarbonateLR Carbon DisulfideNAmmonium ChlorideR Carbon MonoxideRAmmonium FluorideN Carbon TetrachlorideNAmmonium HydroxideN Castor OilRAmmonium Nitrate10R Catsup (Ketchup)RAmmonium SulfateSaturatedR Caustic Potash (Potassium Hydroxide)NAmmonium SulfideN Caustic Soda (Sodium Hydroxide)NAmyl AcetateN Chlorine Gas (Dry)LRAmyl AlcoholN Chlorine Gas (Wet)NAnilineR Chloroacetophone (Tear Gas)NAntimony TrichlorideSaturatedR ChlorobenzeneNAqua Regia (3 parts HCl:1 part HNO3)LR ChloroformNArsenic Acid20R ChocolateRAutomatic Switch GreasesR Chrome AlumSaturatedRAutomotive WaxesLR Chromic Acid20RBaby LotionR CinnamonRBacon FatR Citric Acid10RBarium ChlorideR ClovesNBattery AcidR Coal GasRBeerR Coca ColaLRBeet (Sugar Liquor)R CocoaLRBenzaldehydeN Cod Liver OilRBenzeneN CoffeeLRBenzoic AcidN Cooking OilRBenzyl AlcoholN Copper SulfateSaturatedRBleach6% Chlorine R CresolNBlood and Blood PlasmaR Cupric ChlorideSaturatedRBoraxR Cuprous ChlorideSaturatedRBoric AcidR CyclohexaneRBrake FluidN CyclohexanolLRBromineN CyclohexanoneN1Entries indicate the following: R - Resistant, LR - Limited Resistance (gradual attack *concentration of aquesous solution except where notedover time may occur), N - Not Resistant (rapid attack or attack over short timeperiod will occur)37
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PALSUN Technical Guide

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