Engineering Plastics

Devlon® V-API (known as JW DV-API in China)

Devlon® V-API is a high molecular weight polyamide that is specifically tailored for high temperature/pressure applications in the offshore oil and gas sector. It is yellow in colour.

Typical applications
The particularly low moisture absorption of this grade provides high dimensional stability. This feature combines with excellent impact wear characteristics to make this material invaluable for offshore applications where weight saving and non-corrosion are imperative. It is widely used for valve seats and inserts, clamps, bundle spacers, rollers and bearings.

Positive material identificationTo help protect customers from being misled by inferior 'look'alike' products, James Walker has perfected a method of positive material identification for its range of Devlon® polymers. PMI Technology is a microscopic additive incorporated within the Devlon polymer that can be identified from the smallest sample of material – including fine swarf shavings. The additive can also be detected in parts that may have been melted or burnt during use.

The properties of Devlon are not in any way altered or compromised by PMI Technology, though its inclusion now means that genuine Devlon polymer can be identified quickly and easily.

Click on the fingerprint for more details of James Walker PMI technology.

Typical properties of Devlon® V-API (JW DV-API in China)
Tensile strength @ +23°C (+73°F):
79.92MPa (11592psi) - ASTM D638
Tensile strength @ -40°C (-40°F): 109.52MPa (15885psi) - ASTM D638
Elongation at break @ +23°C (+73°F): 5.37% - ASTM D638

Hardness to Shore D (Rockwell R):
82/85 (112) - ASTM D785
Flexural strength: 121.55MPa (17630psi) - ASTM D790
Deformation under load for 24 hours - 140kgf/cm² @ +23°C (1991lb/in² @ +73°C): 1.0/2.0% - ASTM D621
Charpy impact strength @ +23°C (+73°C): 54.8J/m (1.03-ft-lb/inch) - ASTM D256
Charpy impact strength @ -40°C (-40°F): 19.8J/m (0.37ft-lb/inch) - ASTM D256
Modulus of elasticity: 4138MPa (600175psi) - ASTM 638
Compressive strength: 140MPa (20305psi) - ASTM 695
Compressive yield strength: 91.2MPa (13227psi) - ASTM 695

Linear thermal expansion coefficient @ +30-100°C (+86-212°F):
1.11 x 10-4 mm/mm/°C (0.62 x 10-4 in/in/°F) - ASTM E831
Melt point: +216°C (+421°F) - ASTM D3418
Deflection temperature under load @ 1.82MPa (264psi): +93°C (+199°F) - ASTM D648
Deflection temperature under load @ 0.445MPa (66psi): +209°C (+408°F) - ASTM D648
Service temperature (short term): +190°C (+374°F) - ASTM D570
Service temperature (long term): +125°C (+257°F) - ASTM D570

Dielectric strength: >15kV/mm (>380kV/inch) - ASTM D149
Specific gravity: 1.14 - ASTM D792
Water absorption @ 24 hours: 0.105% - ASTM D570
Water absorption @ saturation: 3% - ASTM D570
Flammability: V2 Burn Rate - ASTM UL94

How supplied
Custom-designed and precision-manufactured components to meet customers' precise specifications.  

For additional information please visit the Devol website

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