GB/T 33319-2025Plastics - Polyethylene (PE) compounds for breathable film (English PDF)

1 Scope

GB/T 33319-2025 is the Chinese national standard covering the filled polyethylene compound that becomes a breathable film - the calcium carbonate loading and its dispersion, which decide whether the stretched film has the micropores that pass vapour but not liquid, as a nappy backsheet must. Issued on 2 December 2025, it has been in force since 1 July 2026, replacing GB/T 33319-2016.

This document specifies the naming, requirements, inspection rules, marking and accompanying documents, packaging, transportation and storage of special polyethylene (PE) compounds for breathable film, and describes the corresponding test methods. This document applies to special polyethylene compounds for breathable film made from polyethylene resin as the matrix, with the addition of mineral fillers and other additives, through melt extrusion granulation.

2 Normative references

The provisions of the following documents constitute the essential clauses of this document through normative references in this text. Among them, for any dated reference, only the version corresponding to that date applies to this document; for any undated reference, the latest version (including all amendments) applies to this document.

GB/T 1033.1 Plastics - Methods for determining the density of non-cellular plastics - Part

3 Terms and definitions

The terms and definitions defined in GB/T 2035 and the following terms and definitions apply to this document.

3.1 breathable film After being cast or blown into film, the film is stretched at a certain temperature to form a certain number of micropores inside, thus creating a breathable function.

3.2 filter pressure difference value DeltaP The difference between the pressure at the end point of the filter pressure test and the pressure 15 minutes prior.

4 Naming

4.1 General rules The naming of special polyethylene compounds for breathable film consists of two character-groups. -- Character group