This document specifies two methods for the determination of the thermal stability of products and compounds based on vinyl chloride homopolymers and copolymers (referred to simply as PVC in the following text) by the extent of the discoloration that occurs when they are exposed, in the form of sheet, to elevated temperatures. The two methods are:<\/p>\n
Method A: Oil-bath method;<\/p>\n<\/li>\n
Method B: Oven method.<\/p>\n<\/li>\n<\/ul>\n
These methods are particularly applicable to the determination of the resistance of PVC to degradation by heat, as assessed by the change in colour after different times of heating under standardized conditions. The results are comparative only, and can be unsatisfactory when coloured PVC materials are tested.<\/p>\n
The stability times given by the two methods might not be similar and cannot be used for direct-comparison purposes.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | European foreword <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 4.1 Method A: Oil-bath method <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 4.2 Method B: Oven method 5 Preparation and number of test specimens 6 Test temperature 7 Method A: Oil-bath method 7.1 Apparatus <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 7.2 Procedure <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 8 Method B: Oven method 8.1 Apparatus 8.2 Procedure <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 9 Expression of results 10 Precision 11 Test report <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Plastics. Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds. Discoloration method<\/b><\/p>\n |