GB/T 3855-2005 in English

《GB/T 3855-2005碳纤维增强塑料树脂含量试验方法》由TC39（全国纤维增强塑料标准化技术委员会）归口，主管部门为中国建筑材料联合会
本标准于1981年首次发布，1989年第一次修订，2005年第二次修订。本标准规定了碳纤维增强塑料树脂含量试验的试样、试验仪器与试剂、试验步骤、计算、试验结果及试验报告等。本标准适用于硫酸在一定条件下能使树脂基体完全分解又不过份地腐蚀纤维的碳纤维增强塑料。本标准代替GB/T 3855-1983《碳纤维增强塑料树脂含量试验方法》。本标准与GB/T 3855-1983相比主要变化如下：
――本标准增加了“方法原理”一章（见第3章）。

1 Scope

This standard specifies the specimens, test apparatus and reagents, test procedures, calculations, test results and test reports, etc. in the test of resin content of carbon fiber reinforced plastics.

This standard is applicable to carbon fiber reinforced plastics in which sulfuric acid may completely decompose the resin matrix under certain conditions without excessively corroding the fibers.

2 Normative reference

The following document contains provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendment to (excluding any corrigendum), or revision of, any of the publication does not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards indicated below. For undated reference, the latest edition of the normative document applies.

GB/T 1463 Test methods for density and relative density of fiber reinforced plastics

3 Principle of method

For specimens of known mass, the matrix part is digested by hot sulfuric acid medium. The residue containing the reinforced material is filtered, cleaned, dried, cooled and weighed after the matrix is dissolved in hot sulfuric acid. The mass fraction of reinforced material is calculated. The fiber volume fraction is calculated according to the densities of composite material and reinforced material.

The mass of reinforced material needs to be corrected if it changes during digestion.

4 Specimen

4.1 Specimen mass and thickness

The specimen mass is about 0.5g and the thickness of specimen is less than 3mm.

Foreword i
1 Scope
2 Normative reference
3 Principle of method
4 Specimen
5 Test apparatus and reagent
6 Test procedure
7 Calculation
8 Test result
9 Test report
Annex A (Normative) Conversion of fiber volume content of carbon fiber reinforced plastics