AI for custom plastics extruders, tested on quotes and resin changes you already handled.

A custom quote starts from a shape. A new RFQ brings a profile print, a resin callout and an annual number, and someone has to work out what that shape will take before it can be priced by the foot, the piece or the thousand. Your estimator has already done that on every RFQ in the file. Your reviewer, the person who knows that desk best, can lay each draft beside the quote that actually went back.

The standards separate the compound from the part. ASTM D4216 classifies rigid PVC compounds for exterior building products by resin type, impact resistance, tensile strength, tensile modulus, deflection temperature and coefficient of linear expansion, and says its requirements don't apply to finished goods. Those sit in other specifications: D3679 for siding, D4477 for soffit, D4726 for window and door profiles, F964 for fencing and railing. A callout on a customer's print can land at either level, which is why a first draft has to keep the two straight.

Some of what you ship carries a mark. The International Residential Code at R703.11 ties vinyl siding to ASTM D3679, with products certified and labeled to show it, according to the association that runs the certification program. That group became the Polymeric Exterior Products Association in April 2024, after decades as the Vinyl Siding Institute, and it now lists D3679, D7793, D7254 and D7445 under accredited third-party certification bodies. A change of compound on a line like that reaches well past purchasing.

Window and recycled-content rules keep moving. AAMA 303, the voluntary specification for rigid PVC exterior profiles in windows, doors and skylights, expanded its section on co-extruded profiles in its 2023 edition, and one trade magazine's summary says that edition keeps recycled PVC to the inner layer that isn't visible or exposed to sunlight. UL moved its requirements for mechanically recycled plastic compounds into a new standard, UL 746S, first published August 30, 2023, and treats regrind shipped to another molder as post-industrial recycled plastic because its traceability is lost. So a substitution has to say what is in the part, down to the layer and the source.

Resin supply can change in a week. The Texas ice storm of February 2021 took resin plants down along the Gulf, and trade press that spring described processors living on cut allotments. Any substitution your team wrote that year is a worked record of what had to be checked, in what order, and what the customer said.

One limit covers both jobs. Nothing in the proof of concept touches your quoting system, your ERP or a live quote, decides that one resin may replace another, or signs a compliance statement. An estimator checks every quote, and a qualified quality or engineering person decides every substitution. Standards are named here for context; this page is not engineering or legal advice.