Sodium Formaldehyde Sulfoxylate, abbreviated as SFS, is widely used in industries where consistent chemical performance is critical. To ensure reliability, manufacturers implement strict quality control procedures during production. These checks help maintain product uniformity, effectiveness, and compliance with industry standards.
SFS is typically a white crystalline powder or granule with high purity levels. A premium-grade product usually contains more than 85 percent active content. Any discoloration or moisture absorption may indicate degradation. Consistent visual appearance is a basic indicator of proper formulation and handling.
The most essential technical parameter for SFS is its assay value, which represents the percentage of the active sulfoxylate compound. Standard industrial specifications require a minimum active content of 85 percent. Higher-purity grades, up to 90 percent, are available for specialized applications. Regular titration tests are performed to verify assay levels.
When dissolved in water at a concentration of 10 percent, SFS typically displays a pH value between 6.0 and 8.0. This near-neutral pH makes the product easy to use in various formulations without altering the system's chemical balance. Maintaining pH consistency is part of standard quality checks.
Low moisture content is crucial to maintaining SFS stability. Most manufacturers control moisture levels below 2 percent. High humidity can lead to hydrolysis, reducing the product’s reducing power and causing clumping or caking. Moisture is routinely tested using drying or Karl Fischer methods.
The presence of insoluble particles in SFS can affect its performance in sensitive processes such as printing or dyeing. Quality control involves filtration or residue testing to ensure insoluble matter is within acceptable limits, typically less than 0.05 percent.
High-purity SFS is expected to be free of heavy metals such as lead, arsenic, or cadmium. Trace elements are monitored using atomic absorption or spectroscopic methods. This ensures the product meets safety standards for industries like textiles and electronics.
Each production batch is tested and recorded with a batch number and technical certificate. Standard documentation includes assay value, moisture content, pH, and other key parameters. This allows traceability and consistent product performance across applications.
SFS is produced in accordance with local and international chemical regulations. It often meets specifications outlined in textile auxiliaries standards or chemical quality indexes. Compliance ensures compatibility with global supply chains and technical applications.
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