testing standards for D4, D5, and D6 in silicone

Related Chinese standards for D4, D5, and D6 in silicone
GB 4806.2: The control standard for the content of volatile compounds in silicone pacifiers is GB 4806.2. The inspection method is based on Article 8.9 of GB 28482, "Safety Requirements for Infant and Young Child Pacifiers", which stipulates that the content of volatile compounds shall not exceed 0.5% (m/m). This standard restricts volatile organic compounds that may be contained in silicone, including D4 and D5.
GB 29204-2012: Food Safety Standard Food Additive Silicone, which stipulates the technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of food additive silicone.
HG/T 2354-2010: Chromatographic silica gel standard, which specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of chromatography silica gel. It is applicable to white amorphous particles with a certain specific surface area and pore volume generated by the reaction of sodium silicate and sulfuric acid. It is mainly used in the chemical industry as an adsorbent, desiccant and catalyst carrier for chromatography silica gel.
Industry-related standards
ZDHC: ZDHC (Zero Discharge of Hazardous Chemicals) provides brands and suppliers with a priority list of restricted substances in production (MRSL), including control requirements for D4, D5, and D6, to ensure the safety and compliance of chemical preparations and chemical raw materials used in production, promote transparency in the supply chain, eliminate hazardous substances from the source, and reduce the risk of product non-compliance in the finished product stage.
ISO: Although there is no specific standard for D4, D5, and D6 in silica gel, some general material testing method standards, such as ISO 17234-1:2010 The detection methods and principles specified in ASTM D5508-94a (2018) can also be used as a reference for the detection and analysis of harmful substances that may be contained in silica gel.
ASTM: There is also no single standard specifically for D4, D5, and D6 in silica gel, but there are some related general test method standards, such as ASTM D5508-94a (2018), which can provide methodological references when detecting harmful substances in silica gel.
Test method standards
Gas chromatography-mass spectrometry (GC-MS): This is one of the commonly used methods for detecting the content of D4, D5, and D6 in silica gel. The principle is to first separate the organic components in the silica gel sample by gas chromatography, and then use a mass spectrometer to perform qualitative and quantitative analysis on the separated components, so as to accurately determine the content of D4, D5, and D6. This method has the advantages of high sensitivity, high selectivity, and high accuracy, and can detect extremely low levels of target substances.
Headspace injection technology: often combined with headspace injection technology, that is, placing the silica gel sample in a sealed headspace bottle, under certain temperature and time conditions, the volatile organic compounds such as D4, D5, and D6 in the sample are volatilized to the gas phase space in the bottle, and then the upper gas is taken for GC-MS analysis. This method can avoid the interference of the sample matrix on the analysis results, improve the accuracy and reliability of the detection, and is especially suitable for the detection of volatile organic compounds in high molecular polymer materials such as silica gel.