The primary objectives of red phosphorus testing include determining the precise content of red phosphorus in a material, assessing its chemical purity and impurity composition, and verifying its stability under specific environmental conditions. Testing technologies for red phosphorus are widely applied in sectors such as electronics and electrical appliances, construction materials and fire-retardant products, chemical manufacturing, and environmental protection and occupational health.

Testing typically encompasses key parameters such as red phosphorus content determination, purity assessment, thermal stability testing, and analysis of residues and toxicity. Procedures must adhere to authoritative domestic and international standards, including China's GB/T 20972-2007, ISO 17234-1:2020, ASTM D5485-2016 (USA), and EN 71-3:2019 (EU).

Commonly used testing techniques include X-ray fluorescence (XRF) spectroscopy, high-performance liquid chromatography (HPLC), thermogravimetric analysis (TGA), inductively coupled plasma mass spectrometry (ICP-MS), and hyphenated TG-IR-GC/MS (thermogravimetry-infrared spectroscopy-gas chromatography/mass spectrometry) technology. Hyphenated TG-IR-GC/MS technology enables rapid qualitative and quantitative analysis of red phosphorus flame retardants in polymers; for instance, the average red phosphorus content in PA6 samples was determined to be 35,695 mg/kg, with a relative error of 2.0%.