Manufacture, process and supply plastic, insulation and rubber products to industry

Plastic, insulation and rubber products

Manufacture, process and supply plastic, insulation and rubber products to industry

www.par-group.co.uk
Preston (Head office): +44 (0) 1257 248369:
Manchester: +44 (0) 1706 363790

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Rubber & Polyurethane Machining

With our CNC machining capabilities, such as vertical milling, turning and routing, we have the capacity to convert a wide range of polyurethane and rubber compounds into custom components and OEM consumable parts. Our CNC and CAD have the expertise to manufacture and replicate anything from simple 2D shapes to complex 3D components, both in low quantities and high volumes as required.

Rubber and polyurethane machining is a good alternative to moulded rubber or cast polyurethane components, as these manufacturing methods often require the commission of tooling. Machining parts removes the requirement for tooling, therefore can provide a cost effective manufacturing method for small scale projects and applications. Furthermore, CNC machining typically enables manufacturing to tighter tolerances than those produced by a moulding process.

We also offer a comprehensive plastic machining service from a wide range of stocked sheet, rod and tube materials.

Applications

Profiled seals and gaskets, wipers, bushes and spacers, damping elements, rollers, moulded rubber replacement components.

In order for us to be able to provide a quotation and manufacture your part, we need a dimensional drawing or pre-existing unworn sample to work from, along with the grade of rubber or polyurethane required.

Availability

Polyurethane Grades (Turned) - Hydrolysis Resistant

Polyurethane materials posess excellent properties in load bearing capacity, abrasion and impact resistance, tear strength, and resistance to oils, water and grease. All grades below are hydrolysis resistant, allowing them to maintain properties and perform well in steam and hot water applications. These particular grades can be turned on a lathe, but cannot be routed or milled.

Grade	Colour	Temperature (°C)	Shore Hardness
FDA Approved*	Red	-30 to +115	94°A (±3)
Standard	Green	-30 to +115	94°A (±3)
Low Temperature	Dark Blue	-50 to +115	94°A (±3)
Hard	Dark Red	-30 to +110	58°D (±3)
Lubricated	Black	-30 to +110	94°A (±3)
Lubricated, Hard	Black	-30 to +110	58°D (±3)
FDA, EU1935/2004 & EU10/2011 Approved	White	-30 to +110	93°A (±3)
Soft	Light Green	-30 to +95	86°A (±3)

*FDA approved red is our standard grade; others available upon request.

Nitrile Rubber Grades (Turned)

Nitrile rubber displays excellent resistance to petrol based fluids, oils and greases. It also offers good mechanical properties such as abrasion resistance and tensile strength, and is often used in the automotive sector. These particular grades can be turned on a lathe, but cannot be routed or milled.

Grade	Colour	Temperature (°C)	Shore Hardness
Standard	Black	-35 to +110	85°A (±5)
Hard	Black	-30 to +110	90°A (±5)
FDA & EU1935/2004 Approved	White	-30 to +105	88°A (±5)
Soft	Black	-35 to +110	73°A (±5)
Low Temperature	Black	-50 to +105	82°A (±5)
Carboxylated (Abrasion Resistant)	Black	-30 to +110	89°D (±5)
Hydrogenated, FDA & EU1935/2004 Approved	Green	-30 to +150	82°A (±5)
Hydrogenated, Hard	Black	-20 to +150	95°A (±5)
Hydrogenated, Soft	Black	-35 to +150	75°A (±5)

EPDM Rubber Grades (Turned)

EPDM is frequently used for seals and gaskets in external applications due to its excellent water, ozone and ageing resistance. EPDM is a durable material and performs well in contact with alkalines, diluted acids and ketones. These particular grades can be turned on a lathe, but cannot be routed or milled.

Grade	Colour	Temperature (°C)	Shore Hardness
Standard	Black	-45 to +135	87°A (±5)
WRAS Approved	Black	-50 to +135	97°A (±5)
FDA & EU1935/2004 Approved	White	-55 to +135	88°A (±5)
Soft	Black	-53 to +135	76°A (±5)
Soft, FDA & EU1935/2004 Approved	White	-50 to +135	77°A (±5)

Silicone Rubber Grades (Turned)

Silicone rubber grades perform well across a much wider temperature range than other rubber materials. They also provide excellent release properties and resistance to ozone, weathering, UV light and moisture. All options provide FDA approval for use in food contact applications. These particular grades can be turned on a lathe, but cannot be routed or milled.

Grade	Colour	Temperature (°C)	Shore Hardness
FDA & EU1935/2004 Approved	White	-60 to +210	84°A (±5)
FDA & EU1935/2004 Approved	Blue	-60 to +210	84°A (±5)
FDA & EU1935/2004 Approved	Red	-60 to +210	83°A (±5)
FDA & EU1935/2004 Approved	Translucent	-60 to +210	79°A (±5)

FKM Rubber Grades (Turned)

FKM is a high specification rubber which displays excellent resistance to elevated temperatures, acids, petrols and oils. It will resist brittleness when exposed to ozone, flame, or high temperatures. FKM is sometimes referred to as FPM and the brand name Viton®. These particular grades can be turned on a lathe, but cannot be routed or milled.

Grade	Colour	Temperature (°C)	Shore Hardness
FDA, EU1935/2004 & EU10/2011 Approved	Brown	-25 to +220	85°A (±5)
FDA & EU1935/2004 Approved	White	-25 to +210	84°A (±5)
Standard	Black	-20 to +220	80°A (±5)
Soft	Black	-25 to +220	74°A (±5)

Neoprene Rubber Grades (Turned)

A popular choice for external sealing applications due to its excellent weathing, ageing and ozone resistant properties. It is suitable for use with most oils and greases and provides moderate resistance to abrasion and tear. These particular grades can be turned on a lathe, but cannot be routed or milled.

Grade	Colour	Temperature (°C)	Shore Hardness
Standard	Black	-40 to +100	81°A (±5)

Technical Specification

Technical Data Sheet - Polyurethane Grades

Technical Data Sheet - Rubber Grades

Polyurethane & Rubber Grades (CNC Milled or Routed)

All of the polyurethane and rubber grades listed above are available for turning only, making them particularly suitable for bespoke flat circular seals with an outside and inside diameter. More complex machined rubber and polyurethane components would be manufactured from standard sheet materials using our milling and routing capabilities.

Please see our polyurethane sheet and rubber sheeting pages for available grades. Please note, to be suitable for machining, the chosen grade must have a shore hardness of at least 70°A.