GB/T 21840-2025 in English

Background of Standard Revision and Technological Evolution

GB/T 21840-2025, as the core standard in the field of vulcanization accelerator TBBS, replaces the 2008 version of the standard, reflecting the continuous improvement of the technical level of my country's rubber additive industry. This revision not only responds to the development trend of international rubber standardization, but also optimizes the technology to address the pain points in actual production applications.

In-depth Analysis of Major Technical Changes

Compared with the 2008 version, the 2025 version of the standard has achieved a number of important breakthroughs in technical content:

Innovation in Initial Melting Point Determination Method

A new instrumental method has been added to determine initial melting point, complementing the visual (arbitration) method. This instrumental method utilizes a capillary melting point apparatus with standardized capillary tube specifications (70mm-100mm length, 1.2mm-1.4mm inner diameter), improving test repeatability and accuracy.

Comparative analysis of purity detection methods

Liquid chromatography uses A C18 column with acetonitrile-water (75:25) as the mobile phase ensured high accuracy and repeatability of the detection.

Implementation Recommendations and Key Quality Control Points

Implementation Recommendations for Manufacturers

1. Production Line Upgrade: To meet the demand for granular products, the granulation equipment and process parameters need to be modified accordingly
2. Testing Capacity Building: Equipped with testing equipment such as High Performance Liquid Chromatograph and Melting Point Apparatus
3. Quality Control System: Establish a full-process quality monitoring system from raw materials to finished products

Notes for Users

1. Product Selection: Select powder or granular products based on the production process
2. Testing and Verification: Regularly test key indicators of incoming products
3. Storage Conditions: Store in strict accordance with standard requirements to avoid product quality deterioration

Impact Analysis of Standard Implementation

GB/T The implementation of 21840-2025 will have a profound impact on the rubber additive industry: it will drive overall improvements in TBBS product quality, promote technological advancements in production processes, and enhance the competitiveness of Chinese rubber products in the international market. Furthermore, the detailed requirements of the standard will encourage manufacturers to strengthen technological innovation and quality control.