GB/T 4721-2021General rules for rigid copper clad laminates for printed circuits (English PDF)

Foreword

This document was drafted in accordance with GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents".

This document replaces GB/T 4721-1992 "General Rules for Copper Clad Laminates for Printed Circuits", compared with GB/T 4721-1992, In addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The scope of the regulations has been changed (see Chapter 1, Chapter 1 of the 1992 edition);

b) The normative references have been changed (see Chapter 2, Chapter 2 of the 1992 edition);

c) The terms "copper-clad surface", "adhesive surface" and "laminated surface" have been deleted (see 3.1, 3.2, 3.3 of the 1992 edition);

d) The definition of the terms "cellulose paper", "whole board" and "cutting board" has been added (see 3.1, 3.4, 3.5);

e) The content of the model representation method has been added. The representation methods of three resins such as cyanate ester, polyphenylene ether and polyester are CE, PO, PE (see 4.1.2);

f) Added the representation method of QC quartz fiber cloth and PC polyester fiber fabric (see 4.1.3);

g) Added product identification system (see 4.3.1);

h) The requirements for reinforcing fiber and resin system have been added (see 5.2, 5.3);

i) The appearance requirements and thickness and tolerances have been changed (see 6.2, 6.3.4, Chapter 6 and 7.2 of the 1992 edition);

j) The recommended size of the copper clad laminate has been changed (see 6.3.1, 7.1 of the 1992 edition);

k) The requirements for the length and width deviation of the shear plate have been added (see 6.3.2);

l) Inapplicable test items such as "surface corrosion", "edge corrosion", "peel strength after simulated electroplating" and "peel strength after dry heat" have been deleted Items (see Table 8 of the 1992 edition);

m) Added regulations for the classification of combustibility (see 6.4);

n) The machinability is changed, and it is now specified in the applicable copper clad laminate sub-specification (see 6.5, Chapter 9 of the 1992 edition);

o) Changed the name of "Inspection Rules" to "Quality Assurance" and adjusted the position (see Chapter 8, Chapter 10 of the 1992 edition);

p) Added "dimensional stability", "glass transition temperature", "Z-axis expansion coefficient", "thermal decomposition temperature", "thermal stratification time", "heat resistance" and "phase Test items such as specific tracking index, "halogen content", and "thermal conductivity" (see Table 10);

q) The storage conditions of copper clad laminates have been changed (see Chapter 9.2, Chapter 11 of the 1992 edition);

r) Added the requirements for order information (see Chapter 10);

s) Modified the model correspondence table in Appendix A, deleted 7 inapplicable models, and added 14 models according to market demand (see table A.1, Table A1) of the 1992 edition.

1 Scope

This document specifies the terms and definitions, classification and model, naming and marking of rigid copper clad laminates, as well as materials, appearance, dimensions, and quality.

Common requirements such as quantity assurance, packaging, marking, transportation and storage.

This document applies to rigid copper clad laminates for printed circuits (hereinafter referred to as copper clad laminates).

This document does not apply to special copper clad laminates such as metal base and ceramic base.

2 Normative references

The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 1913.2 Bleached wood pulp paper for printed boards

GB/T 2036 Terminology for Printed Circuits

GB/T 4722-2017 Test method for rigid copper clad laminates for printed circuits

GB/T 5230 Electrolytic copper foil for printed boards

GB/T 18373 E glass fiber cloth for printed boards

SJ/T 11282 Specification for "E" Fiberglass Paper for Printed Boards

3 Terms and definitions

The following terms and definitions defined in GB/T 2036 apply to this document.