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GB/T 46211-2025 Active
GB/T 46211-2025 Plastics—Hardeners and accelerators for epoxide resins—Determination of free acid in acid anhydride
Abstract
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.
General Product Information
| Document Type | National standards |
|---|---|
| Standard Status | Active |
| Standard Code | GB/T 46211-2025 |
| CCS | Basic standards and general methods for synthetic resins and plastics |
| ICS | Thermosetting plastics |
| Implement Date | 2026-03-01 |
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