印度采购需求：纤维素醚生产商、供应商、羟丙基甲基纤维素、HPMC、纤维素醚、甲基纤维素

I'm looking to source RDP and HPMC powder for our upcoming projects. We need these materials in bulk and are particularly interested in understanding the available grades, specifications, and pricing options. Quality is a priority, so any information on your quality assurance processes or certifications would be appreciated as well. Additionally, could you provide details on lead times, shipping options, and payment terms? We're aiming to have a reliable supplier that can meet our demands on a regular basis, so information on your capacity to fulfill larger orders would also be helpful. Looking forward to your prompt response with the necessary details to move forward.