ISO 14632:2021 Extruded sheets of polyethylene (PE-HD) — Requirements and test methods

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Extruded sheets of polyethylene (PE-HD) — Requirements and test methods

1 Scope

This document specifies the requirements and test methods for solid flat extruded sheets of polyethylene homopolymers (PE-HD) without fillers or reinforcing materials.

This document is applicable only to thicknesses of 0,5 mm to 40 mm. It also applies to PE-HD sheet in rolled form.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test

ISO 179-2, Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test

ISO 291, Plastics — Standard atmospheres for conditioning and testing

ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles

ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics

ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics — Part 1: Standard method

ISO 1133-2, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics — Part 2: Method for materials sensitive to time-temperature history and/or moisture

ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method, liquid pycnometer method and titration method

ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient column method

ISO 1183-3, Plastics — Methods for determining the density of non-cellular plastics — Part 3: Gas pyknometer method

ISO 2818, Plastics — Preparation of test specimens by machining

ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation

ISO 17855-1, Plastics — Polyethylene (PE) moulding and extrusion materials — Part 1: Designation system and basis for specifications

3 Terms a nd definiti ons

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp

— IEC Electropedia: available at http:// www.e lectropedia .org/ 4 Material

Sheets shall consist of PE extrusion compounds designated by ISO 17855-1 without fillers or reinforcing materials. Extrusion compounds can contain additives such as processing aids, stabilisers, flame protective agents and colorants.

Compounds and additives of unknown identity shall not be used.

NOTE Legal requirements can cause a specific choice of extrusion compounds (see 5.3.3).

5 Requirements

5.1 Appearance

Sheets shall be substantially free from bubbles, voids, cracks, visible impurities and other defects which would make them unfit for the intended use. Surfaces shall be substantially smooth and free from sharp grooves, sink marks or damage.

Colorants shall be homogeneously distributed throughout the material. Slight colour differences due to the particular extrusion compound or processing procedure used are admissible. Admissible variations in any of the above shall be agreed between the interested parties. Sheets shall be examined in accordance with 6.3.

5.2 Dimensional tolerances

5.2.1 Thickness

Within any individual sheet, referring to the nominal thickness, the tolerance on thickness shall be as shown in Formula (1):

|Δh| ≤ ± |0,08 mm + 0,03 × h| (1)

n

where

Δh is the tolerance on thickness, in millimetres;

h is the nominal thickness, in millimetres.

n

Testing shall be in accordance with 6.4.1.

5.2.2 Length and width

Nominal length, l , and nominal width, b , of sheets shall be agreed between the interested parties. n n

Unless agreed differently, the length shall be in the direction of extrusion.

For any individual sheet selected at random from any delivery, the tolerances on length and width shall be in accordance with Table 1. Testing shall be in accordance with 6.4.2.

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