Superseded
Standard
Historical
NBN EN 922:1995
Plastics piping and ducting systems - Pipes and fittings of unplasticized poly(vinyl chloride) (PVC-U) - Specimen preparation for determination of the viscosity number and calculation of the K-value
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Summary
This Standard specifies a method for determining the viscosity number and K-value of a PVC-resin derived from a pipe, fitting or compound. In this standard, only the method for isolation of the PVC-resin is detailed, while for the determination of viscosity number reference is made to ISO 174. An equation for the calculation of K-value (according to Fikentscher) from viscosity data is given (K-values corresponding to a series of viscosity numbers for PVC resin are given for information in annex A). The presence of other polymers may invalidate the method (see clause 3).
Technical characteristics
| Publisher | Bureau de Normalisation Belge (NBN) |
| Publication Date | 01/01/1995 |
| Cancellation Date | 03/31/1995 |
| Page Count | 9 |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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