Buying poly(ethyl vinyl ether) (PVE, CAS 25104-37-4) base oil is mostly about specifying the right viscosity grade and checking the COA – and, when your application needs it, ordering a custom viscosity. This guide covers the specification sheet, the key parameters and the custom-grade process.
1. The Specification Sheet (PVE 68 Example)
| Parameter | Value | Why it matters |
|---|---|---|
| Appearance | Colorless to light yellow transparent liquid | Visual QC |
| Kinematic viscosity (40 °C), mm2/s | 65-71 | Core grade property |
| Residual solvent | ≤0.01 | Process cleanliness |
| Water, wt% | ≤0.05 | Stability and storage |
| Density (15 °C), g/cm3 | 0.980-1.000 | Dosing and transport |
| Acid value, mg KOH/g | ≤0.03 | Purity, additive compatibility |
| Saybolt color | ≥15 | Lightness/purity |
| Dimer (GC), % | <0.1 | Low oligomer content |
2. What a Complete COA Should Show
- Product name, CAS (25104-37-4), batch and date.
- Measured kinematic viscosity at 40 °C.
- Density (15 °C), water, acid value, Saybolt color, residual solvent, dimer.
- Test methods used.
3. Ordering a Custom Viscosity
Because PVE viscosity is set by molecular weight during polymerization, custom grades are made to order:
- State your target kinematic viscosity at 40 °C (e.g. VG 32, 46, 68, or a custom value).
- Describe the application (compressor, refrigeration, vacuum, hydraulic).
- Confirm packaging and trial quantity.
- Receive a sample/COA for evaluation before bulk order.
4. Verification on Arrival
- Check appearance and viscosity at 40 °C first.
- Confirm water and acid value if the oil goes into sensitive systems.
- Verify Saybolt color and dimer content against COA.
5. Packaging and Storage
- 200 kg steel drums or 1000 kg IBC tote; smaller trial packs available.
- Store sealed, cool and dry, away from ignition sources.
- Keep containers closed after sampling; the material is a flammable liquid.
6. FAQ
What is the minimum order for a custom viscosity?
Custom grades are made to order; trial quantities are available – contact us for details.
Can you supply PVE 32 and 46 as well?
Yes – ISO VG 32, 46 and 68 are standard grades, and other viscosities can be customised.
7. References and Further Reading
- ISO 3448 viscosity classification.
- Supplier COA and MSDS for the specific grade quoted.
This article is published for industrial and technical reference by PolyblueChem. Verify against the supplier’s COA and applicable standards.
See our PVE synthetic base oil guide and the viscosity grade guide. PolyblueChem supplies poly(ethyl vinyl ether) (PVE, CAS 25104-37-4) in custom viscosity grades – contact us for specifications and quotations.