POLYVINYL ACETATE (P.V.A.) ADHESIVES
1. (a) No effect
(b) & (c) Separation of constituents, breakdown of emulsion.
2. (a) No serious effect, unless temperature very high.
Should be stored in a warm place. If allowed to freeze the emulsion is liable to break down, with consequent lumping and loss of adhesive properties. See also IMDG Code & US CFR.
1. (a), (b), (c) No effect
2. (a) Softening; distortion, and finally melting at 115 degrees C.
Should be stored in a cool place, away from heat.
PVC PRINTED SHEET
1. (a), (b), (c) Normally no effect, although under certain conditions staining could result.
(d) If staining results this is usually permanent and cannot be removed. Staining could result if rolls of sheeting were submerged in salt or fresh water which was contaminated with oil, rust, or other materials.
2. (a) Excessive heat will melt the sheet and could cause the surfaces to stick together. If the sheet is embossed, heat may cause the embossing to be removed.
Apart from the danger of the surfaces of the sheet sticking together under heat, most PVC printed sheeting is liable to develop a brown or black discoloration if exposed to a sulphite atmosphere, therefore the material should be stowed in a cool place, away from boilers, and from any possible contamination.
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