Engineering plastics
PVC-U
Unplasticised polyvinyl chloride
The most common and most economical thermoplastic valve material in water treatment, chemical dosing and irrigation lines. Resistant to acids and bases, not resistant to heat.
- HARDNESS
- Shore D 80
- Rm · MPa (typical)
- 41–71
- TEMPERATURE
- 0 … +60 °C
- COST
Design
Polymer; defined by its structure and filler type rather than chemical composition.
Mechanical properties
| TYPE · CONDITION | Rm MPa | Elongation at break % | Hardness | Coefficient of friction | Water absorption % |
|---|---|---|---|---|---|
| Unfilled, typical | 41–71 | — | Shore D 80 | — | 0.05–0.2 |
Typical values (the standard gives no minimum values); they vary with grade and filler. Converted from US units.
Service temperature
0 °C+60 °C−200−1000100200300400500600700800
0 … 60 °C. The allowable pressure drops above 20 °C.
Physical properties and heat treatment
- DENSITY
- ≈ 1.4 g/cm³
Media suitability GENERAL TREND
Water
Steam
Mineral oil
Fuel, aliphatic HC
Ozone, outdoor
Dilute acid
Caustic
Ketones, esters
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- The most economical thermoplastic
- Good resistance to acids and bases
- Easy installation by solvent cementing
Weaknesses
- Not used above 60 °C
- Brittle in the cold
- Dissolves in ketones and aromatic solvents
Manufacturing and use
- ECONOMY
- Very low.
- MANUFACTURING METHODS
- Injection moulding · Extrusion
- TYPICAL VALVE PARTS
- Body (thermoplastic valve) · Ball · Union
Used in 3 Emsal products
- 078Threaded 2-piece ball valveLever grip
- 079Threaded 3-piece ball valvePlastic coating · Lever grip
- 081Monoblock ball valvePlastic coating
Source: EN ISO 1452 (system). Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.