For any B2B procurement manager or R&D scientist, understanding the precise specifications of a chemical product is crucial for ensuring optimal performance and compliance. Sodium Metabisulphite (SMBS), a widely used chemical auxiliary, has specific grades and parameters that buyers must consider. As a leading manufacturer and supplier of Sodium Metabisulphite in China, we aim to provide clarity on these critical specifications.

Sodium Metabisulphite is primarily available in two main grades: Industrial Grade and Food Grade. The key differentiating factor is the purity level and the permissible limits for impurities. For instance, Industrial Grade typically requires a purity of 97% min (as Na2S2O5), while Food Grade often demands a higher purity, such as 98% min. Both grades share common specifications like Sulfur Dioxide (SO2) content, typically 65.0% min, which dictates its efficacy as a reducing or bleaching agent.

Critical parameters that buyers should scrutinize include Arsenic (As), Heavy Metals (as Pb), Selenium (as Se), and Iron (as Fe) content. For Food Grade Sodium Metabisulphite, these impurity levels are strictly controlled to ensure safety for consumption. For example, Arsenic content might be limited to 0.0002% max, and Heavy Metals to 0.0005% max. Industrial Grade might have slightly higher tolerances, but still adheres to relevant industry standards. Water Insoluble content, typically below 0.02% for Food Grade and 0.05% for Industrial Grade, also indicates product quality and processing efficiency.

The pH Value, usually between 4.0-4.8 for both grades, is another important factor influencing its application in various chemical processes. When you are looking to buy Sodium Metabisulphite, especially from a supplier in China, always request a detailed Certificate of Analysis (CoA) that outlines these specific parameters. This document serves as a guarantee of the product's quality and suitability for your intended use, whether it's for water treatment, textile dyeing, or food preservation.

As a dedicated manufacturer, we ensure that all our Sodium Metabisulphite products, both industrial and food grades, are produced under strict quality control measures. We understand that consistent specifications are vital for our clients' manufacturing processes. We encourage you to purchase Sodium Metabisulphite from us by reaching out for detailed product specifications and samples. Partnering with a reliable Chinese supplier means securing chemicals that meet your exact needs.