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Description: POLYSTYRENE SHEET 1. (a) Little or no action. (b) & (c) There may be a tendency to slight swelling of surface, with possible distortion. 2. (a) Thermal distortion - local overheating may result in carbonization. (b) Slightly distorted sheets could be restraightened by heat and pressure. Contact with other plasticized thermoplastic sheet, e.g. cellulose acetate, should be avoided, due to tendency of plasticizer migration. The material should be stored in a cool place, away from direct sunlight, as certain modified polystyrene sheets are liable to impairment of physical properties as a result of contact with sunlight. SURFACE COATING RESINS 1. (a) Material in sealed containers not affected. In bags no permanent damage. (b) No effect on material in sealed containers. In bags, reclamation may be possible. (c) Sealed containers should protect material. In bags, it should be possible to reclaim. (d) Resins in bags may possible be dried, but complete removal of salt is not easy. 2. (a) The resin would probably be rendered unusable. Resins in general are heat reactive and must be kept away from heat. Being compounded of oils, natural resins, etc., they are to some extent inflammable and should accordingly be stowed in a cool place. See also IMDG Code & US CFR. POWDERED UREA RESINS 1. (a) Caking of powder. (b) Caking of powder, poor performance of glue solution owing to diluting effect. Short-circuiting of glue in high- frequency heating. (c) Caking of powder, poor performance of glue solution owing to diluting effect. 2. (a) The powder becomes insoluble in water. Should be stored away from heat, not on open deck. See also IMDG Code & US CFR.
Index: 579
Commodity Name: PLASTICS

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