2026-11-09
Vinyl acetate is quoted in several forms, and the form changes the commercial content of the offer as much as the product does. Bulk in an ISO tank, bulk in a road tanker and packed in drums carry different quantity bases, different handling obligations and different costs that sit outside the material itself. Comparing them requires reading past the first line.
Bulk quantities are usually stated net of the container tare and reconciled against a weighbridge or a tank gauge; packed quantities are stated as a count of drums with a nominal net weight each. Those two bases are not interchangeable, and a small difference in the assumed net weight per drum becomes a material difference across a full container load. Ask which basis is used before comparing totals.
Two offers can both read vinyl acetate monomer and still specify different inhibitor bands, which correspond to different intended transit and storage conditions. The band is part of the product definition, not a detail to be settled later. An offer that does not state the band is incomplete, because the receiving plant cannot write a storage instruction without it.
Where the seller arranges transport, the offer usually carries an assumption about how long the vehicle may stand at the gate. Free time and waiting charges are commercial terms that can exceed the value of a small quantity difference, particularly where a receiving site has limited discharge capacity. A site that can unload a tanker in one shift and a site that needs two are not buying the same service.
Some offers include an arrival analysis and some leave it to the buyer. Since the useful life of inhibited monomer depends on storage conditions after delivery, the testing arrangement is a substantive term. An offer that specifies what is tested, by whom, and what happens if the result sits at the edge of the band is easier to compare than one that says nothing at all.
The practical method is to write the four items side by side before any figure is discussed: quantity basis, inhibitor band, delivery obligation and testing arrangement. Once those four align, the commercial comparison becomes meaningful. Done the other way round, a lower figure often turns out to describe a smaller quantity, a wider band or a delivery obligation that has quietly moved to the buyer.
The grades this note was written against.
Reference this note and your grade; we reply with the batch-side detail for Standard VAM.
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sales2@liwei-chem.com
+8615380400285
Fred Wang
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