Primasil Silicones Limited of Weobley, Herefordshire at COMPAMED 2017 in Düsseldorf -- MEDICA Trade Fair

Primasil Silicones Limited

Kington Road, HR4 8QU Weobley, Herefordshire
United Kingdom of Great Britain and Northern Ireland

Telephone +44 1544 312660
Fax +44 1544 312669

Hall map

COMPAMED 2017 hall map (Hall 8a): stand R19

Fairground map

COMPAMED 2017 fairground map: Hall 8a

Our range of products

Product categories

  • 01  Components, parts, modules, Original Equipment Manufacturers
  • 01.39  Silicone components
  • 11  Manufacturing Services
  • 11.15  Extrusion
  • 11.15.04  Rubber moulding

Rubber moulding

  • 11  Manufacturing Services
  • 11.15  Extrusion
  • 11.15.10  Clean-room moulding

Clean-room moulding

  • 11  Manufacturing Services
  • 11.15  Extrusion
  • 11.15.11  Injection moulding

Injection moulding

Our products

Product category: Silicone components, Silicone tubings, Silicone

Medical Silicone Rubber | UK Manufactured by Primasil

Silicone rubber is an extraordinary material
With subtle alterations to its chemistry the changes in properties can produce material safe enough for baby bottle teats, and parts tough enough to withstand the demands of jet engines.

Primasil are the UK leaders in the formulation and mixing of HCR and Platinum-Cure silicone rubber, with each formulation customised to exactly meet our customers’ requirements. LSR is bought “off the shelf” from global suppliers, and our experts work closely with the customer to ensure the best fit possible.

The popularity of Liquid Silicone Rubber (LSR) in medical device manufacturing owes much to its biocompatibility and the excellent quality of production components. The reduced human contact during processing reduces the risk of contamination, especially when manufactured in a clean room environment.

It is typically supplied in two parts, one of which contains a curing catalyst. These are automatically mixed, along with colours and any other ingredients, as the material is pumped to a press.

High Consistency Rubber (HCR), or Heat Cured Rubber, also plays a big part in our silicone rubber manufacturing operations. Again a choice is available between platinum and peroxide curing.

The dangers of harmful bacteria and MRSA are now widely recognised. The food and healthare industries now demand materials thats can eliminate these dangers to provide a safe environment.

Primasil have developed "biosil", an independently tested anti microbial silicone rubber that actively breaks down the bacteria, killing the strain.

Being odour free, non toxic, and non leaching, biosil is ideal for all food and healthcare applications.

Silicone Rubber has the following advantages:
  • Biocompatible and non toxic
  • Withstands common sterilization methods
  • Operating temperature range of -50ºc to +250
  • Hardness ranging from 10 to 90 Shore A
  • Can be pigmented to virtually any colour
  • Inherently flame retardant
  • Weather and ozone resistant
  • Electrically conductive or insulating
For medical applications, we often recommend platinum as the catalyst. Ideally suited for applications where strength, durability, long-life and non-reactivity with bodily fluids and skin are important. Platinum-cured products meet or exceed these global standards:

  • ISO 10993
  • US Pharmacopoeia Class VI
  • European Pharmacopoeia 3.1.9
  • FDA CFR177.2600
  • BfR and FDA Food Contact Regulations
Compared to peroxide-cured materials they have the following advantages:

  • Superior clarity
  • Smoother inner wall which results in less protein binding
  • No contamination from peroxide residues
  • Fewer extractables
Primasil can also provide medical peroxide-cured materials where required.
 Our Anti-micobial material BIOSIL datasheet here

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Product category: Silicone components, Silicone tubings, Silicone


Silicone medical tube has two main advantages over other materials: it is highly flexible and tear-resistant, and hence ideal for transporting fluids. Plus it contains no plasticisers or other additives that could leach into a drug product and cause toxicological issues.
We can manufacture medical tubing to your preferred bore size, wall thickness and tube length. We also extrude thin-walled medical tubing.

Primasil medical tube is manufactured in line with our ISO 13485 certification and the platinum-cured products are made in our ISO Class 7 (10,000) cleanroom.

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Product category: Silicone components, Silicone tubings, Silicone


The SAINT – the ultimate Single-use Anti-Infection Tourniquet – has been developed to help prevent the spread of hospital-acquired infections.

While other tourniquets tend to be uncomfortable and difficult to use, the SAINT offers a special high-comfort silicone rubber formulation and an easy-secure, easy-release functionality. Its other key benefits are:

  • 100% latex free
  • FDA compliant
  • Conforms to USP Class VI
  • Conforms to 93/42/EEC Class I Medical Device Single-use only
  • ISO 10993

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Product category: Silicone components, Silicone tubings, Silicone


For many cancer patients, the worry and discomfort from their diagnosis and chemotherapy treatment is compounded by the confidence-sapping side effect of hair loss.

In collaboration with a university partner, Primasil helped Paxman to develop its initial, innovative cooling cap in the 1990s. Essentially it consists of a compact refrigeration system connected to a lightweight silicone rubber cap made from HCR.
By lowering the head and scalp temperature immediately before, after and during treatment, it reduces blood flow to the follicles and so prevents or minimises damage.

To make the device even more effective and satisfy growing demand, the collaboration improved the cap’s fit and introduced greater levels of automation to its production process.

Our first challenge was to create a new formulation which would give the cap sufficient flexibility to adapt to varying head shapes and sizes across the world.

Our second task was to review the manufacturing process and automate it wherever possible, allowing more efficient and higher volume supply in response to market needs and opportunities.

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About us

Company details

Our 'can-do' attitude has been key to our growth
Primasil was founded in 1978 to meet industry’s growing requirement for silicone rubber.

Originally a moulding company, Primasil soon expanded to offer extrusion and develop their own custom formulations, quickly becoming the leading independent UK supplier of silicone rubber compounds.

Today, Primasil continues to supply silicone products and materials all over the world to many different industries, including the quality led medical industryusing the brand name "Medisil".

Based on a ‘can do’ attitude, Primasil has succeeded with challenging products where other companies have failed. This had led to many successful long-term partnerships with a diverse range of customers – from small local manufacturers to the largest multinationals.

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