Do not approve a PVC resin substitute from an SG label or a K-value alone. Ask how the supplier’s designation maps to the actual specification and which test methods support the comparison.
Compare data rather than translating names informally
SCGC’s SG500 technical sheet reports K-value with ISO 1628-2 and also lists other physical properties. It identifies its figures as typical, not a purchase specification. The grade name is specific to that producer and should not be treated as a universal naming rule.
Request the offered resin’s polymerisation type, full grade code, K-value or other molecular-characterisation field with method, and relevant physical attributes. If an offer supplies a value under a different method, retain the difference rather than entering the numbers into one unqualified column.
| Cross-reference field | What to retain |
|---|---|
| Designation | Producer, grade code and naming system |
| Characterisation | Property, method and reporting basis |
| Physical properties | Relevant density, particle and other agreed tests |
| End use | Buyer’s processing and product qualification |
Write “not established” where needed
A missing method or unsupported conversion should remain an open qualification item. A buyer may choose to test a candidate despite the gap, but should not call the materials equivalent before the required evidence exists.
Send ENVO the current producer grade, application, specification and processing constraints. Request an actual candidate data sheet and sample. This article concerns identity and specification matching; the separate question of die pressure during a resin switch still needs its own process investigation.
Related decisions
- PVC apparent bulk density: calculate hopper capacity without confusing solid density
- PVC plasticizer absorption: distinguish a resin test from the dry-blend endpoint
Review Polyvinyl Chloride (PVC) Resin product identity and purchasing requirements. For the decision above, send ENVO your application, acceptance criteria, quantity and destination. Confirm the offered grade and available documents before ordering.
Technical references support the stated material or test method. Confirm the offered grade and current acceptance criteria for your application. Quality and document guidance
Share your application, target properties and test conditions to discuss the next step.
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