GB/T 23936-2018 in English

Background and significance of standard revision

GB/T 23936—2018 National Standard for Industrial Sodium Fluorosilicate is a comprehensive revision of the original standard GB/T 23936—2009. This revision is mainly based on the following considerations:

• Classification standardization: The product is divided into Type I (dry product) and Type II (semi-dry product) to facilitate selection in different application scenarios.
• Indicator optimization: Key indicators such as sulfate and phosphorus pentoxide have been adjusted to improve product quality requirements.
• Heavy metal control: New requirements for heavy metal detection have been added to ensure product safety and environmental protection.

Technical requirements and test methods

The standard specifies the technical indicators of industrial sodium fluorosilicate, including sodium fluorosilicate content, free acid, loss on drying, etc., and provides detailed test methods:

• Determination of sodium fluorosilicate content: Titration method is used, calculated by the consumption of sodium hydroxide standard solution.
• Determination of free acid: Titration with sodium hydroxide in potassium chloride ethanol solution.
• Determination of loss on drying: Dry at a constant temperature until the mass is constant, and calculate the water loss.

Implementation suggestions and precautions

To ensure the effective implementation of the standard, it is recommended that:

1. Enterprises should establish an internal quality control system and be equipped with professional testing equipment.
2. Strictly carry out product quality inspections in accordance with the sampling methods and frequencies specified in the standard.
3. Strengthen employee training to ensure that the standard requirements are correctly understood and implemented.