Vinyl Acetate Monomer EVA Grade HQ 7-9 · inhibitor 7-9 ppm
The working band for EVA plants that must hold vinyl acetate content inside a tight window run after run. Feed purity and water matter as much as the inhibitor figure here, because the copolymer composition responds to every impurity that enters with the monomer and the specification is judged on the polymer rather than on the tank.
Typical values, not for specification. Batch certificate governs delivery.
| VA purity | 99.9 wt% min (typical) |
|---|---|
| Water | 200 ppm max (typical) |
| 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 |
| 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) | 7-9 ppm |
| Storage stability | Depends on temperature, oxygen availability and inhibitor consumption; periodic HQ and polymer re-test recommended |
Vinyl acetate content decides whether an EVA is a soft film resin or a stiff moulding compound. This section connects the feed specification to the property the customer actually buys.
Vinyl acetate content is the single strongest lever on EVA properties. As the acetate fraction rises, chain regularity falls, crystallinity drops and the melting range moves down, so a resin that was stiff and opaque becomes flexible and clearer. That is why a copolymer producer treats the feed specification as a property specification: a drift in monomer quality becomes a drift in melting behaviour that the customer notices before the plant does.
Control therefore sits at the feed, not only at the reactor. Purity, water and the small oxygenates that travel with the monomer all influence how the comonomer is incorporated, and each of them can move independently of the inhibitor figure. An online or rapid inlet analysis paired with a documented response to drift is more useful than a single certificate value, because it catches the change while the batch is still running.
Stainless steel or aluminium only. Confirm the headspace practice against documented supplier guidance instead of assuming a nitrogen blanket is protective.
Analyse each delivery for purity, water and acidity as well as inhibitor content. The three together describe the feed better than any single figure, and copolymer composition responds to all of them.
Correct the comonomer ratio from measured analysis rather than from the previous batch. Habitual correction slowly walks a line away from its target without any single step looking wrong.
Keep the tank shaded and the headspace arrangement constant, so that the feed arriving at the reactor is comparable from week to week.
Stainless steel or aluminium throughout, no copper alloys and no rusted fittings. Trace metals can disturb a copolymerisation in ways that are hard to diagnose afterwards.
Each route below links to the application map for the full grade set.
Film, foam and moulding grades on one line
Resins specified by melting behaviour
Copolymers with defined softening windows
Compounds needing consistent flexibility
Copolymers tuned for resilience
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 EVA Grade HQ 7-9; 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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