GB/T 46211-2025 Active National standards

GB/T 46211-2025 Plastics—Hardeners and accelerators for epoxide resins—Determination of free acid in acid anhydride

GB/T 46211-2025 Plastics—Hardeners and accelerators for epoxide resins—Determination of free acid in acid anhydride

Publish Date: 2025-08-29 Implement Date: 2026-03-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Price: $ 33.00

Basic Information

Standard Code: GB/T 46211-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods for synthetic resins and plastics

ICS Name: Thermosetting plastics

Publish Date: 2025-08-29

Implement Date: 2026-03-01

Pages: 12 pages

Scope

This document describes two methods for determining the free acid content in acid anhydride hardeners and accelerators used in epoxy resins: spectrophotometry and potentiometric titration.
The spectrophotometry method in this document is suitable for most acid anhydrides except polyester and oligomeric acid anhydrides (also known as "oligomeric acid anhydrides"). The potentiometric titration method is suitable for all acid anhydrides.
Note: The results of spectrophotometry tests for polyester and oligomeric acid anhydrides show significant variability.

Development Information

Word Count: 13 Thousand words Pages: 12 pages

Referenced Standards

GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions GB/T 601-2016 Chemical reagent—Preparations of reference titration solutions GB/T 6283-1986 Chemical products—Determination of water—Karl fischer method (general method) GB/T 6283-2008 Chemical products—Determination of water Karl·fischer method(general method) GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 12808-2015 Laboratory glassware—One mark pipettes

Adopt standards

ISO 7327:1994

Related Standards

GB/T 4616-1984 Replaced

GB/T 4616-1984 Phenolic moulding materials—Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state)

Publish Date: 1984-07-30

GB/T 4617-1984 Replaced

GB/T 4617-1984 Phenolic mouldings—Determination of acetone-soluble matter

Publish Date: 1984-07-30

GB/T 5471-1985 Replaced

GB/T 5471-1985 Preparation method for compression moulding of specimens of thermosetting moulding materials

Publish Date: 1985-10-17

GB/T 5472-1985 abolished_transferred

GB/T 5472-1985 Test method for rectangular flow cure properties of thermosetting moulding compounds

Publish Date: 1985-10-17

GB/T 5473-1985 Replaced

GB/T 5473-1985 Phenol-formaldehyde mouldings—Detection of free ammonia

Publish Date: 1985-10-17

GB/T 5474-1985 Replaced

GB/T 5474-1985 Phenol-formaldehyde mouldings—Determination of free ammonia and ammonium compounds—Colorimetric comparison method

Publish Date: 1985-10-17