CELLULOSE ACETATE SHEET ROD, TUBE, FILM, FOIL, PROFILE SHAPES
1. (a) Temporary effect: if 35% R.H. rising to 95% R.H. expansion of plastics 0.5% linear; properly packed no permanent distortion should result.
(b) & (c) If immersed for longer than a few minutes warping would ensue later and on drying out.
(d) Seawater contamination would need washing off with clean water. Warped sheets could be flattened in presses. Film and badly warped shaped articlea could be reworked only as scrap.
2. (a) Heat up to 140 degrees F, if not prolonged, and if articles properly packed, would not cause appreciable damage. If articles come under pressure from packing they may have surface markings impressed, or become distorted.
(b) Sheets can be repolished at the manufacturers' factory.
Exposed surfaces of some types of cellulose acetate plastics may develop mold on prolonged exposure to high humidity in warm climate. Stowage should be in a cool, dry place. See also IMDG Code & US CFR.
POLYSTYRENE MOLDING MATERIAL
1. (a) No effect, providing moisture does not condense on the granules.
(b) & (c) No chemical effect, but molding properties will be impaired.
(d) Drying would restore quality, provided no other contaminants has been introduced, e.g. dust or dirt.
2. (a) Material softens, granules coalesce and finally may char and burn.
(b) Material which has coalesced can be reground, provided no charring or discoloring has occurred, but has only scrap value.
Polystyrene has a surface static electrical effect which attracts dirt, and therefore contaminates very easily from air, especially if the packages are broken. And contents exposed should be stowed under-deck away from heat. See also IMDG Code & US CFR.
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