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PLASTICS

Description: POLYTHENE MOLDING MATERIAL 1. (a) & (c) Adversely affects molding properties. (b) A for (a) but with additional deterioration of electrical properties. (d) Drying rectifies damage caused by (a) and (c) but not that caused by (b). 2. (a) The material consolidates at temperatures above 50 degrees C and melts 110 degrees C. "PERSPEX" ACRYLIC SHEET 1. (a) No effect on the product, but the protective paper is subject to mold growth. (b) & (c) Very little effect on the product itself, but water removed the protective paper coating and this leads to damage of the surface of the sheets. 2. (a) Temperatures above 50 degrees C are liable to damage the surface protection and may also cause the sheets to warp. Damp storage conditions should be avoided. LAMINATED IMPREGNATED WOOD 1. (a) Because of protective steps taken, risk of damage from this cause is negligible. (b) Material exposed to salt water should be regarded as scrap. (c) Immersion up to twelve hours probably harmless. (d) Material restored to its original condition by stoving at 105 degrees C for about a week. 2. (a) Permanent exposure up to 130 degrees C has negligible effect. Beyond that, certain distillations are apt to take place, but the time factor is important in assessing the amount of damage that would be caused. (b) Damage caused by heat cannot not be reversed. This material has no susceptibilities except surface growth of mold, and this is largely inhibited in tropical grades of the product. Such mold growth may easily be wiped off the surface. The material should receive cool storage.
Index: 584
Commodity Name: PLASTICS

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