Product Info

Vulclast® Guide

45° Vulcanised O-rings

Making a scarf jointed O-ring may seem simple, but it is a precise and specific process to achieve a high-performance bond compatible with the extruded cord.

Virtually any ID 1.78–30 mm cord ISO 3302-1 Class E1
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The concept

Scarf jointed O-rings have become an industry standard for static sealing applications, especially where non-standard diameters are required. The major benefit is that these rings can be made in almost any size without the need for expensive mould tooling.

Making a jointed O-ring may seem simple, but it is a precise and specific process. A high-performance bond must be compatible with the extruded cord. The conventional method involves bringing the cut ends of the extruded cord together and using a solvent-based adhesive to create the bond.

Our manufacturing process

At Eastern Seals, we manufacture our own range of high-quality hot vulcanised scarf jointed O-rings for this diverse and demanding market. We have completed the development process and launched our Vulclast® range.

Our bonding process provides a strong bond that matches the extruded cord, ensuring compatibility with the generic compound used and imparting similar physical properties and chemical resistance.

The critical aspects of our process include measuring the extruded cord, bonding, ensuring bond strength, finishing, and conducting final visual and dimensional inspections.

Inspection

We carry out 100% visual inspection on all produced rings, examining them for abnormalities by slightly pulling and twisting the joint. Extreme bending of the joint is not recommended as it does not undergo such bending during use.

We also sample check bond integrity using a computer-controlled tensile tester to assess the strength of the base cord. Results are documented and reports can be provided to customers upon agreement.

Quality

Achieving the highest quality of product is paramount to us. We have implemented a unique method to achieve dimensionally accurate finishes and tolerances around the bonded join area while adhering to ISO 3302-1 Class E1 standards.

Sample checks are conducted on inside diameter measurements, dependent on ring size, using modern camera technology to ensure compliance with current BS and ISO tolerances. For rings larger than standard sizes, we apply an in-house tolerance based on the nominal diameter.

Vulclast® quality packs

Tensile strength testing

Measures how much force a material can take before it snaps. It gives customers a clear picture of durability and helps compare compounds when performance is critical.

Olypsys® dimensional measurements

High accuracy optical measurements used to check the physical dimensions of parts. This is useful when tolerances are tight and customers want confirmation that their parts match the drawing.

3.1 material certificate

A document issued with batch traceability and raw material test data, normally aligned to EN 10204. It provides measured results for properties such as hardness, tensile, elongation and specific gravity.

Main attributes of our Vulclast® range

  • Rapid manufacturing process.
  • Can be made to virtually any inside diameter without expensive tooling.
  • Cords available in a wide range of compounds, with cross sections from 1.78 mm up to 30 mm and Shore hardnesses from 60 to 90.
  • Extruded cord tolerances meet or exceed ISO 3302-1 Class E1.
  • High bond strength compared to the cord itself.
  • Joint interface compatible with the extruded cord.
  • In-house bond strength testing as part of our quality control.

Delivery and certification services

In addition to our quality standards, we offer services that align with our commitment to being the premium supplier in the industry.

  • Emergency service, shipped within 24 hours of order receipt, conditions apply.
  • Bond strength test reports available with certification upon agreement.

Need help?

Talk with our Vulclast® specialists

Share the inside diameter, cord cross section, compound and quantity you need and we will confirm the best manufacturing route.

Phone: +44 (0) 1670 840529
Email: sales@easternseals.co.uk

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Prefer to talk first? Call +44 (0) 1670 840529.