CHEMICAL RESISTANCE

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CHEMICAL RESISTANCE

Chemicals Resistance Table Low Density and High Density Polyethylene
ISO/TR 7472, 7474; Carlowitz: “Kunststofftabellen-3. Auflage”.

INTRODUCTION

The table in this document summarises the data given in a number of chemical resistance tables at present in use in
various countries, derived from both practical experience and test results.
The table contains an evaluation of the chemical resistance of a number of fluids judged to be either aggressive or not
towards low and high density polyethylene. This evaluation is based on values obtained by immersion of low and high
density polyethylene test specimens in the fluid concerned at 20 and 60°C and atmospheric pressure, followed in
certain cases by the determination of tensile characteristics.
A subsequent classification will be established with respect to a restricted number of fluids deemed to be
technically or commercially more important, using equipment which permits testing under pressure and the
determination of the “coefficient of chemical resistance” for each fluid. These tests will thus furnish more complete
indications on the use of low and high density polyethylene products for the transport of stated fluids, including their use
under pressure.
SCOPE AND FIELD APPLICATION
This document establishes a provisional classification of the chemical resistance of low and high density
polyethylene with respect to about 300 fluids. It is intended to provide general guidelines on the possible
utilisation of low and high density polyethylene: – at temperatures up to 20℃ and 60℃
– in the absence of internal pressure and external mechanical stress
(for example, flexural stresses, stresses due to thrust, rolling loads, etc.).
Sat. sol
Saturated aqueous solution, prepared at 20°C

  • Tank fittings and pipes should be fitted with bellows or flexible piping.
  • Base of tank must be mounted on a solid, level base.
  • There must be no overhang of tank on base.
  • Make sure fittings are tight, but do not over tighten.
  • The weight and quality specifications are recorded for your benefit – make sure you get the right product for the task.
  • Do not lift tank containing any contents.
  • Keep tanks away from any hot exhaust gasses.

DEFINITIONS, SYMBOLS AND ABBREVIATIONS

The criteria of classification, definitions, symbols and abbreviations adopted in this document are as follows: S = Satisfactory The chemical resistance of low or high density polyethylene exposed to the action of a fluid is classified as “satisfactory” when the results of test are acknowledged to be “satisfactory” by the majority of the countries participating in the evaluation. L = Limited The chemical resistance of low or high density polyethylene exposed to the action of a fluid is classified as “limited” when the results of tests are acknowledged to be “limited” by the majority of the countries participating in the evaluation. Also classified as “limited” are the resistance to the action of chemical fluids for which judgements “S” and “NS” or “L” are pronounced to an equal extent. NS = Not satisfactory The chemical resistance of low or high density polyethylene exposed to the action of a fluid is classified as “not satisfactory” when the results of tests are acknowledged to be “not satisfactory” by the majority of the countries participating in the evaluation. Also classified as “not satisfactory” are materials for which judgements “L” and “NS” are Sol Aqueous solution at a concentration higher than 10 %, but not saturated