Plan a trial for your application
Rigid PVC extrusion
Use the same stabilizer and screw conditions. Record fusion time, torque and profile surface finish.
Flexible PVC compounding
At the same plasticizer ratio, compare uptake rate, dry-blend flow and fish-eyes in pressed sheets.
| Form or grade | Suitability and verification |
|---|---|
| Suspension resin | For extrusion or calendering, evaluate fusion, particle porosity and plasticizer absorption. |
| Emulsion or microsuspension paste resin | For coating or dipping, compare paste viscosity, changes during storage and gelation. |
Purchase specifications and incoming inspection
Include the intended grade or current specification in the enquiry. Use the table to compare selection criteria and inspection conditions. The specification agreed by both parties defines the contractual limits. ENVO · Polyvinyl Chloride (PVC) Resin catalogue and specifications ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| K value | Dimensionless | ENVO SG3: 71–72; SG5: 66–68. | Use the same solution-viscosity method. Different SG grades are not interchangeable on price alone. |
| Viscosity number | mL/g | ENVO SG5: 107–118. | Identify solvent, concentration and test temperature. |
| Volatiles (including water) | % by mass | ENVO SG5 ≤0.40 | Check drying conditions. Total volatiles are not necessarily water. |
When approving a sample, record the grade, methods, limits and specification revision. On receipt, match the packing lot number to the lot-specific COA and record the measured values and release decision.
From samples to commercial delivery
Packaging and receiving
The public listing specifies 25 kg bags. Match the SG grade to the label and store each grade separately.
Storage and handling
Keep dry blends from both lots at changeover. Include loose powder bulk density and conveying method in the enquiry.
Sample and order lead times
State processing equipment, trial batch size and monthly demand. Confirm same-grade samples, first-order MOQ, staged deliveries and arrival date.
The reference shows an SG-5 resin bag with separate grade and net weight markings. Verify the actual bag label and lot for your order.
Questions from the plant
What if the resin fusion rate does not suit our extrusion line?
Specify extrusion, calendering or paste processing. Compare fusion and defects in the finished part.
Why did die pressure change when moving from SG5 to SG3?
Check K value and viscosity number. Keep external lubricant and processing conditions constant, then compare torque and state of fusion.
Report a delivery or batch issue
Include the order number, lot number from the package, label photos and inspection records for the affected lot. When retesting, check degree of polymerization or K value, Apparent density, plasticizer uptake.
Request documents for your application
TDS · Technical data sheet
For grade selection and sample approval, specify the grade and revision required.
SDS · Safety data sheet
Specify the country or region of use and the required language.
COA · Certificate of analysis
Request a sample COA during supplier review. For incoming inspection, provide the actual lot number.