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Standards and Specifications Governing Carbon Fiber Prepreg Materials

2026-07-18 16:58:15

25561

Carbon fiber prepreg materials rely on systematic industry standards and specifications to regulate material classification, technical indicators, testing methods, production quality, and application adaptability. These authoritative norms cover international universal standards, Chinese national standards, aerospace industry specifications, and mechanical performance testing standards, guiding the production, inspection, and engineering application of carbon fiber prepreg.

1. Chinese National Standards (GB/T Series)

National standards form the basic specification system for civilian and industrial-grade carbon fiber prepreg in China, defining core technical parameters and universal testing rules.

GB/T 28461-2012: The core national standard for carbon fiber prepreg, specifying classification, technical requirements, test methods, inspection rules, packaging, storage and transportation requirements for conventional carbon fiber prepreg materials. It covers key indicators including resin content, volatile content, gel time, and surface quality.
GB/T 3362-2017: Standard test method for tensile properties of carbon fiber multifilament, providing basic mechanical performance testing support for prepreg raw materials.
GB/T 3354-2014: Test method for tensile properties of oriented fiber-reinforced polymer matrix composites, applicable to mechanical performance verification of prepreg laminated panels.

2. Aviation Industry Standards (HB Series)

Aviation industry specifications are tailored for high-end, high-precision carbon fiber prepreg used in aerospace, military equipment, and high-reliability industrial fields, with stricter performance thresholds.

HB 7772-2005: Specification for epoxy resin/carbon fiber prepreg, standardizing material formula, curing process, and mechanical property requirements for aerospace-grade epoxy-based carbon fiber prepreg.
HB 5392 & HB 6701 Series: Specialized industry standards for medium-temperature curing epoxy carbon fiber prepreg, clarifying process parameters and quality evaluation criteria for aviation-specific prepreg materials.

3. International Universal Standards (ISO / ASTM Series)

Widely adopted in global trade, cross-border engineering, and international high-end manufacturing, these standards unify global prepreg testing and evaluation benchmarks.

ISO 527-5: Specifies test conditions for tensile properties of unidirectional fiber-reinforced plastics, defining standard test temperature, humidity and test speed for prepreg mechanical testing.
ISO 14126: International standard for compressive property determination of fiber-reinforced plastics, regulating compressive performance testing of carbon fiber prepreg composites.
ISO 22821:2021: Specifies thermogravimetric analysis methods for fiber mass content of carbon fiber-reinforced plastics, for accurate detection of prepreg fiber and resin ratio.
ASTM D3039: Classic standard test method for tensile properties of polymer matrix composites, universally used for prepreg tensile strength and modulus detection.
ASTM D5379: Standard for Iosipescu shear test of composite materials, guiding shear performance testing of carbon fiber prepreg laminates.

4. Core Regulated Technical Specifications

All authoritative standards uniformly constrain the key technical indicators of carbon fiber prepreg, which are the core basis for material quality evaluation:

Component indicators: Fiber content, resin content, volatile matter content, and residual gel rate, ensuring material component uniformity.
Mechanical performance indicators: Tensile strength, tensile modulus, compressive performance, shear strength, and bending performance, matching different load-bearing working conditions.
Process performance indicators: Gel time, curing temperature range, storage stability, and laying forming adaptability, guaranteeing construction and molding quality.
Appearance & dimensional indicators: Uniform thickness, flat surface, no impurities, no delamination, and stable areal density.

5. Application Classification Specifications

Standards divide carbon fiber prepreg into different grades based on application scenarios:

Civil industrial grade: Complies with GB/T national standards, suitable for ordinary machinery, 3C products, and civilian composite parts.
Aerospace high-grade: Implements HB aviation industry standards, requiring high precision, high stability, and fatigue resistance for high-end equipment manufacturing.

In summary, carbon fiber prepreg materials are governed by a complete set of hierarchical standards from national civil norms, high-end industry specifications to international universal test standards, covering full-process quality control from raw material performance, process parameters to finished product inspection.

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