Silicone and Specialist Mixing

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The Elastomeric Compounding Specialists

Providing unparalleled quality and technical advice since 1979.
Clwyd Compounders have over 40 years experience supplying quality compounds to a wide ranges of industries.

We Understand rubber in-depth – from formulation to application – and can supply compounds to meet the most demanding of end-user specifications in industries ranging from oil & gas to food processing. We also understand the needs of downstream processors, working closely with our customers to ensure the compounds we supply process efficiently thus minimising waste.

Our laboratory has continuously improved and expanded over our 40 years of business and we now have extensive testing facilities available on site.

Lab Facilities

We have established a good relationship with our numerous test equipment suppliers, and we plan to continue to expand our testing capabilities in the future. We hope to introduce additional test equipment that will further improve our ability to evaluate the performance and processing characteristics of our compounds, as well as supporting our customers in the test results that they require.
Quality control is always our number one priority and our approach is to assess the compounds as they are being mixed and feedback any relevant information to our processing operators in real time. This allows us to identify any batches that deviate from the mean and investigate the cause so that we can take relevant preventative measures to ensure the batches sent to dispatch are of the highest quality and meet our internal QC limits. Testing gates and limits are continuously maintained by a dedicated process controller we have operating on site.

Moving die rheometers (MDRs), Mooney viscometers, Dispergraders and Colour Spectrophotometers are among the test equipment utilised at this stage.

Provided they meet our stringent quality control requirements, batches that require additional testing are then sent to our specification testing area. We regularly test compounds to AMS, DTD, MIL, BS, ASTM D2000 and Def Stan specifications. If you require testing to industry specific specifications or prefer to use your own internal specifications, we can add them to our system.

The test equipment used in this area includes: Tensometers, Compression set jigs, Ozone cabinet, Gehman torsional stiffness (Low Temperature), Non-brittle (Low Temperature) and ovens for accelerated ageing and fluid immersion tests.

Compound development, raw material evaluation and product validation are other very important aspects of our business. This is another area where our testing facilities are regularly utilised to improve and validate compounds to ensure we are using the highest quality raw materials and polymers. We are able to use our TGA and FTIR to help with our validation process.

If you have a compound development opportunity that you require assistance with then please don’t hesitate to contact us. A dedicated member of our technical team will take ownership of your project, first working with you to define the scope of the project and then providing updates and feedback throughout the process. We have the capability to mix small scale (1-2kg) Banbury and mill mixes in house that can then be scaled up to full production quantities with a very fast turnaround.
Hardness BS ISO 48 ASTM D2240 ASTM D1415
Dispersion BS ISO 11345 ASTM D7723
Density BS ISO 2781 A1 ASTM D297 pt16
Tensile BS ISO 37 ASTM D412
Tear Strength BS ISO 34-1 ASTM D624
Compression Set BS ISO 815-1 ASTM D395
Heat Resistance BS ISO 188 ASTM D573
Effect of Liquids BS ISO 1817 ASTM D471
Ozone Resistance BS ISO 1431-1 ASTM D1149
Low Temperature BS903-A13 BS ISO 1432 ASTM D2137
Corrosion Resistance BS ISO 6505

Silicone and Specialist Mixing

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We offer a full compounding service, from formulation to application, and customers usually approach us from one of the following start points:

Supplying High Quality Elastomeric
and Technical Expertise
to meet rigorous customer requirements
and new industry standards


Mixing Capabilities

Laboratory Quality Control