PVC Ningbo Formosa Plastics S‑85
PVC Ningbo Formosa Plastics S‑85
Material Introduction: PVC Ningbo Formosa Plastics S‑85 is a high‑polymerization‑degree polyvinyl chloride resin produced by suspension‑polymerization, normally supplied as white powder. It is classified as paste resin, well‑known for high elasticity and excellent plasticizer‑absorbing capacity.
Main Applications
High‑elasticity products: special sealing strips, elastomer components, etc.
PVC film materials for household swimming pools: used for manufacturing deformation‑resistant and aging‑resistant swimming‑pool liners.
Other high‑end soft‑grade products: premium artificial leather, soft toys, high‑performance hoses and other fields requiring extremely high flexibility and resilience.
Physical Properties
| Test Item | Test Method / Condition | Unit | Reference Value / Range | Remarks |
|---|---|---|---|---|
| Average Degree of Polymerization | ‑ | P | 2300‑2700 | High polymerization degree is its prominent feature |
| Bulk Density | GB/T 3402‑1994 | g/ml | 0.43‑0.51 | |
| Volatile Matter Content | GB/T 2914‑1999 | % | ≤0.3 (refer to superior grade of S‑80) | Including water content |
| Sieve Residue (0.25 mm sieve) | GB/T 2916‑1997 | % | ≤1.0 | |
| Sieve Residue (0.063 mm sieve) | GB/T 2916‑1997 | % | ≥93 | |
| Fish‑eye Count | GB/T 4611‑1993 | pcs/400cm² | ≤20 | |
| Whiteness | 160℃, 10 min, GB/T 15595‑1995 | % | ≥76 | |
| Plasticizer Absorption | GB/T 3400‑2002 | g/100g resin | ≥28 | High plasticizer absorption capacity |
| Residual Vinyl Chloride Content | GB/T 4615‑1984 | ppm | ≤3 | |
| Impurity Particle Count | GB/T 9348‑1988 | pcs | ≤16 |
Processing Parameters
| Process Step / Parameter | Unit / Condition | Reference Value / Range | Remarks & Description |
|---|---|---|---|
| Material Handling | ‑ | Normally no drying required | If damp: dry 3 h in hot‑air oven at 60‑70℃, or 1‑1.5 h in dryer at 80℃ (general suggestion for S‑80) |
| Melting Temperature | ‑ | Strictly controlled | PVC is heat‑sensitive. S‑85 features high polymerization degree and higher melt viscosity; processing temperature shall be properly adjusted, meanwhile decomposition must be strictly prevented. Processing temperature for paste resin is generally lower than ordinary rigid‑grade PVC. |
| Injection Speed (if injection molding) | ‑ | Low‑speed | Excessive shear will degrade material |
| Injection Pressure (if injection molding) | ‑ | High pressure | High‑pressure & low‑speed injection is commonly adopted |
| Screw Rotational Speed (extrusion / injection) | Surface velocity m/s | ≤0.15‑0.2 | Avoid excessive shear and frictional heat |
| Back Pressure (if injection molding) | bar | As low as possible, typically around 5 | Max up to 150 bar; lower value preferred |
| Mold Temperature | ℃ | Approx. 40 (general suggestion for S‑80) | |
| Barrel Residence Time | Above 200℃ | ≤3‑5 min | Prevent thermal degradation |
| Thermal Stability Reminder | ‑ | Stabilizer addition is mandatory | PVC tends to decompose under over‑heating or long‑time heat exposure. Suitable thermal stabilizers, lubricants and other additives shall be incorporated into formulation. |
Disclaimer: All above data is for reference only.
