Vinyl Acetate Monomer HQ 3-5 · inhibitor 3-5 ppm
The lowest inhibitor band in the series, supplied as a clear colourless liquid with a characteristic ester odour. Because the hydroquinone window is narrow, the grade suits plants that charge monomer within days of delivery rather than weeks: captive PVAc emulsion lines, regional adhesive works and coating plants with small, fast-moving tank stock. Deliveries are scheduled against the charging plan rather than against a tank level.
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) | 3-5 ppm |
| Storage stability | Depends on temperature, oxygen availability and inhibitor consumption; periodic HQ and polymer re-test recommended |
The lowest inhibitor band in the range rewards speed. This section sets out how to size the working tank, time the arrival test and keep stock moving instead of parked.
Draw a sample from the tanker before discharge and confirm the hydroquinone band and polymer content against the lot data. A narrow window leaves little margin for a slow intake, so the check happens before anything enters the storage tank.
Set tank capacity around two weeks of consumption. Oversized storage is the usual reason a short-window grade ages on site, and a smaller tank keeps the material turning over while leaving room for a delivered lot plus a safety margin.
Route the tank straight to the reactor and avoid holding it behind other grades. Once the batch is charged, record the lot number, the test result and the charge time so that any later drift in induction behaviour can be traced to a specific delivery.
Stainless steel or aluminium only. Confirm the headspace practice against documented supplier guidance instead of assuming a nitrogen blanket is protective.
Use stainless steel or aluminium. Copper, zinc, galvanised surfaces and rusted iron can seed decomposition, so keep them out of the wetted path including hoses, sight glasses and pump internals.
Confirm the blanketing arrangement with the supplier rather than assuming an inert blanket is protective. Hydroquinone works together with dissolved oxygen, and a fully inerted tank is not automatically the safer choice.
Keep the tank shaded, ventilated and away from heat sources. Vapour is heavier than air and remains uninhibited, so vents and low points need attention as much as the liquid itself.
Bond and earth the tanker, the hose and the receiving tank before transfer begins. The flash point sits below ambient temperature, so vapour in the line is the practical ignition risk during unloading.
Each route below links to the application map for the full grade set.
PVAc emulsion plants charging several times a week
Regional binder lines with short tank residence
Saturation resin batches charged to order
Small-volume binder runs with fast turnover
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 3-5; 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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