This is a sources sought notice for market research, not a solicitation, to identify vendors capable of blending and spin-riffling approximately 120 kg of bituminous coal into 2,000 to 2,500 bottles for a NIST Standard Reference Material. The work must be completed within 17 weeks of award, with optional line items for processing up to 180 kg or 90 kg of coal/coke into up to 3,000 or 1,500 bottles, respectively, each also due within 17 weeks of material receipt. No budget amounts are specified. Performance location is not stated. Responses are voluntary and must include a capability statement addressing company details, business size, relevant experience, and whether the product is U.S.-manufactured.