Vinyl Acetate Monomer HQ 12-20 · inhibitor 12-20 ppm
A wide band chosen by buyers who need two sourcing options and can accept a slightly wider spread in the arrival figure. It is the practical answer for a plant that must keep running when one route is disrupted, because the specification leaves room for a second lot to be blended in without rewriting the storage instruction.
Typical values, not for specification. Batch certificate governs delivery.
| Chemical name | Vinyl Acetate Monomer (VAM) |
|---|---|
| CAS / EINECS | 108-05-4 / 203-545-4 |
| Formula / MW | C4H6O2 / 86.09 |
| Appearance | Clear, colourless liquid, free of suspended matter |
| VA purity | ≥ 99.9 wt% (typical) |
| Water | ≤ 200 ppm (0.02 wt%, typical) |
| Acidity as acetic acid | ≤ 50 ppm (typical) |
| Acetaldehyde | ≤ 50 ppm (typical) |
| Methyl acetate | ≤ 50 ppm (typical) |
| Ethyl acetate | ≤ 250 ppm (typical) |
| Colour | ≤ 5 Pt-Co (typical) |
| Distillation range @760 mmHg | 72.3 – 73.1 °C |
| Density @20/20 °C | 0.9320 – 0.9345 g/cm³ |
|---|---|
| Boiling point | 72.7 °C |
| Melting point | − 93.2 °C |
| Flash point (closed cup) | − 8 °C |
| Autoignition temperature | 385 – 427 °C (source dependent) |
| Explosive limits in air | 2.6 – 13.4 vol% |
| Vapour pressure @20 °C | 11.7 kPa |
| Vapour density (air = 1) | 3.0 |
| Solubility in water @20 °C | ≈ 2 g/100 mL |
| Refractive index n20/D | 1.395 |
| Inhibitor (hydroquinone, HQ) | 12-20 ppm |
| Storage stability | Depends on temperature, oxygen availability and inhibitor consumption; periodic HQ and polymer re-test recommended |
A second source is only useful if the plant can absorb it. This section sets out how a wide band supports two routes, and what has to be verified before the first blended batch.
Hold allocations with two suppliers or two shipping routes and keep the tank instruction written around the wide band rather than around one supplier habit. The instruction then survives a switch without being rewritten under time pressure.
Take contract volumes in several parcels rather than one large lot. Smaller parcels turn over faster, and a wide band makes the smaller parcel economical because the specification does not change between them.
Agree in advance how much variation in the arrival figure is acceptable and what happens at the edge of that range. A written tolerance turns a borderline result into a decision instead of a dispute.
When two lots are combined, run the first batch as a check batch at standard recipe and compare the conversion curve with the reference. Blending changes the average inhibitor figure, and only the reactor confirms the effect.
Confirm what induction time the recipe can absorb before a higher inhibitor average is charged. This is a plant-specific question and the answer belongs in the batch record, not in a general rule.
Stainless steel or aluminium only. Confirm the headspace practice against documented supplier guidance instead of assuming a nitrogen blanket is protective.
Review both routes on a fixed cycle and keep a minimum cover for the slower one, so that a single missed sailing does not force an emergency purchase at the worst moment.
Record the lot numbers, volumes and arrival figures for every component of a blended tank. A blended tank without a component record cannot be investigated later.
Stainless steel or aluminium, with no copper or zinc in the wetted path and no rusted fittings anywhere in the transfer system.
Shade the tank and keep the headspace arrangement unchanged between lots, otherwise the comparison between two sources becomes a comparison between two storage regimes.
Each route below links to the application map for the full grade set.
Plants with contracted multi-port supply
Binder lines needing continuous cover
Coating plants running through disruption
Binder producers with seasonal peaks
Every export lot ships with a batch certificate of analysis.
Compare the inhibitor band, storage window and delivery form side by side.
Technical, knowledge and commercial notes written for this product line.
Send your required volume, delivery form and site for Celanese VAM HQ 12-20; we reply with the matching grade, the batch documentation and the shipping window.
+8615380400285
sales2@liwei-chem.com
+8615380400285
Fred Wang
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