What to gather before the request leaves your desk
Write thickness in inches or millimetres, solid versus multiwall, width and sheet size, color/finish, and whether a named ASTM method is an acceptance condition. Quantity sits against each configuration. Destination is a US state or postal code plus the requested delivery window.
If light transmission matters, say so as a question on the quoted grade. Do not treat a brochure percentage as this desk's published value. Documents (material declaration, dimensional page, UV-side marking) belong to the quoted line, not to a trading-company certificate.