GB/T 47391.3-2026Plastics - Unsaturated-polyester powder moulding compounds (UP-PMCs) - Part 3: Requirements for selected moulding compounds (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

"Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents".

This document is Part 3 of GB/T 47391 "Plastics - Unsaturated-polyester powder

moulding compounds (UP-PMCs)". GB/T 47391 has already issued the following parts.

- Part 1.Designation system and basis for specifications;

- Part 2.Preparation of test specimens and determination of properties;

- Part 3.Requirements for selected moulding compounds.

This document is modified adopted from ISO 14530-3.1999 "Plastics - Unsaturated-

polyester powder moulding compounds (UP-PMCs) - Part 3.Requirements for selected

moulding compounds".

The technical differences between this document and ISO 14530-3 and their reasons

are as follows.

- MODIFY the scope (see Clause 1 of this document);

- REPLACE ISO 14530-1 with the normatively referenced GB/T 47391.1 (see

Clause 1, Clause 3, and 4.2 of this document), to adapt to the technical conditions

of China;

- REPLACE ISO 14530-2.1999 with the normatively referenced GB/T 47391.2-

2026 (see Clause 1, Clause 3, note 1 to Table 1, and 5.1 ~ 5.3 of this document), to

adapt to the technical conditions of China;

- MODIFY the test condition for dielectric dissipation factor in Table 1 from 100 Hz

to 1 MHz, to adapt to the technical conditions of China;

- ADD Clause 5 "Test methods", to adapt to the technical conditions of China;

- ADD Clause 6 "Inspection rules", to adapt to the technical conditions of China;

- ADD Clause 7 "Marking, packaging, transportation, and storage", to adapt to the

technical conditions of China.

The following editorial changes have been made to this document.

- ADD note 3 to Table 1;

Plastics - Unsaturated-polyester powder moulding

compounds (UP-PMCs) - Part 3.Requirements for selected

moulding compounds

1 Scope

This document specifies the physical and chemical properties, inspection rules, marking,

packaging, transportation, and storage of unsaturated-polyester powder moulding

compounds (UP-PMCs) and their compression-moulded or injection-moulded test

specimens, and describes the test methods.

This document applies to the production and inspection of three selected types of

unsaturated-polyester powder moulding compounds.

The properties used to characterize moulding compounds, as well as the corresponding

test methods and test conditions, are selected from GB/T 47391.2-2026.

Moulding compounds are classified into different models according to composition and

properties. Moulding compounds of different models shall be designated in accordance

with GB/T 47391.1.

2 Normative references

The following referenced documents are indispensable for the application 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.

GB/T 2035 Plastics - Vocabulary (GB/T 2035-2024, ISO 472.2013, NEQ)

GB/T 2547 Plastics - Sampling method

GB/T 47391.1 Plastics - Unsaturated-polyester powder moulding compounds (UP-

PMCs) - Part 1.Designation system and basis for specifications (GB/T 47391.1-

2026, ISO 14530-1.1999, MOD)

GB/T 47391.2-2026 Plastics - Unsaturated-polyester powder moulding compounds

(UP-PMCs) - Part 2.Preparation of test specimens and determination of properties

(ISO 14530-2.1999, MOD)

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in GB/T 2035, GB/T

47391.1, and GB/T 47391.2-2026 apply.

4 Requirements

5 Test methods

10 %; for properties listed as items 3.1 and 3.2, the deviation between an individual

determined value and the average value shall be less than 5 °C.

6 Inspection rules