越南采购需求：石英，二氧化硅石英，氧化硅石英，SiO2石英，氧化物

I'm reaching out to inquire about your high purity fused silica product, specifically the quartz powder with a purity range of 99%-99.999%. I'm particularly interested in understanding the smallest particle size of the fused silica that you can provide at a minimum purity of 99.9%. Additionally, could you share the pricing details, including your minimum order quantity and any bulk purchasing options? I'm keen to know the lead time for delivery post-contract signing. This information will greatly assist me in making a timely decision. Looking forward to your detailed response!