YS/T 1195-2017 in English

Analysis of the core content of the standard

Technical indicators	Grade I	Grade II	Grade III
Silicon tetrachloride content (mass fraction)	≥99.50%	≥98.00%	≥95.00%
High boiling matter content	≤0.10%	≤0.20%	≤0.50%
Boron content (μg/g)	≤0.02	≤2.00	≤10.00

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Key Technical Requirements

The standard classifies silicon tetrachloride products into three grades. The key technical indicators for Grade I products include: silicon tetrachloride purity ≥99.5%, high-boiling substances ≤0.1%, and boron content ≤0.02μg/g. The standard also specifies control indicators for the total amount of metallic impurities, such as iron, aluminum, and titanium. Grade I products are required to have a value of ≤0.10μg/g, which is crucial for high-end applications such as optical fiber preforms.

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Test Method Specifications

The standard appendix specifies in detail:

• Determination of main component content by gas chromatography (Appendix A)
• Determination of trace elements by ICP-OES (Appendix B)

The detection limit for boron is 0.01μg/g, using hydrofluoric acid digestion-inductively coupled plasma optical emission spectrometry to ensure data accuracy.

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Safety Operation Specifications

Chapter 7 of the standard emphasizes:

1. An explosion-proof ventilation system must be used
2. Operators must wear gas masks and rubber gloves
3. In case of leaks, dry sand should be used for fire extinguishing; direct use of water for fire extinguishing is prohibited

This is because silicon tetrachloride, when in contact with water, will produce corrosive hydrogen chloride fumes, which may cause respiratory burns.

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Recommendations for the implementation of the standard

1. Manufacturers should establish:

• Raw material traceability system
• Graded storage management system
• Emergency response plan

2. Users should note:

• Different grades of products correspond to different downstream uses
• Nitrogen protection must be maintained during transportation
• Storage temperature should be ≤30℃

The implementation of this standard will promote the standardized development of the polysilicon industry chain and enhance the comprehensive utilization value of by-products.