... 0-5mm 2,CIQ ,SGS,IS High Quality silicon metal #421 factory Specifications: 1.CIQ ,SGS,ISO quality certificate.2. ... energy to produce domestic and industrial electricity. Used in electronic parts.3. Used in producing monocrystalline and polycrystalline silicon ... high purity for electronic parts. such as semi conductors, etc.4. Used in Automobbile wheel alloy. High Quality silicon metal #421 factory