BIW Isolierstoffe GmbH

Postfach 1115, 58240 Ennepetal
Pregelstr. 5, 58256 Ennepetal
Telephone +49 2333 8308-0
Fax +49 2333 8308-10


Hall map

K 2016 hall map (Hall 6): stand A15, stand A33

Fairground map

K 2016 fairground map: Hall 6


Anja Langner

Marketing, Vertrieb, Werbung, PR

Pregelstr. 5
58256 Ennepetal, Germany



Our range of products

Product categories

  • 01  Raw materials, auxiliaries
  • 01.05  Rubbers
  • 01.05.022  Silicone rubber (SI)
  • 01  Raw materials, auxiliaries
  • 01.12  Reinforcing fibres, -materials
  • 01.12.026  Textile glass fabric

Textile glass fabric

  • 02  Semi-finished products,parts and reinforced plastics
  • 02.01  Processing technologies
  • 02.01.002  Products made by extrusion

Products made by extrusion

  • 02  Semi-finished products,parts and reinforced plastics
  • 02.01  Processing technologies
  • 02.01.009  Parts made by foaming

Parts made by foaming

  • 02  Semi-finished products,parts and reinforced plastics
  • 02.01  Processing technologies
  • 02.01.010  Parts made by injection moulding

Parts made by injection moulding

  • 02  Semi-finished products,parts and reinforced plastics
  • 02.04  Product groups
  • 02.04.001  Semi finished products
  •  Semi finished products of rubber

Semi finished products of rubber

  • 02  Semi-finished products,parts and reinforced plastics
  • 02.05  Products
  • 02.05.007  Coatings


  • 02  Semi-finished products,parts and reinforced plastics
  • 02.05  Products
  • 02.05.010  Sealing profiles

Sealing profiles

  • 02  Semi-finished products,parts and reinforced plastics
  • 02.05  Products
  • 02.05.011  Sealings/Sealrings


  • 02  Semi-finished products,parts and reinforced plastics
  • 02.05  Products
  • 02.05.058  Hoses


  • 02  Semi-finished products,parts and reinforced plastics
  • 02.05  Products
  • 02.05.060  Cords


Our products

Product category: Silicone rubber (SI)


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Product category: Silicone rubber (SI)


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Product category: Silicone rubber (SI)


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Product category: Silicone rubber (SI)


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Product category: Parts made by foaming


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Product category: Parts made by injection moulding

Cable Protection Systems

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Product category: Semi finished products of rubber

Cable Protection Systems

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Product category: Hoses


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Company news




Jul 29, 2016


BIW has been the key producer of (cable) protective sleeves for probe applications for decades. The performance of our manufacturing facilities is currently at around 1,500,000 metres per week.

In this way, BIW proves its competence and is thus recognised as worldwide market leader in the silicone-coated glass silk hose product group. At the headquarters in Ennepetal, the full range of specialist hoses is developed and manufactured. Depending on customer requirements and uses, the hoses are characterised by the following features, for example:



Cost-optimisation by way of scalable textiles Basic constructions
As further development of braiding technolog BIW offers increasingly more cost-effective knitted and fine-knit solutions
Very good compression in installation
Excellent fulfilment of friction requirements
Adjustable fire behaviour in accordance with customer requirements
Very good high temperature resistance
Maximum reduction of volatile silicone components thanks to subsequent thermal treatment
Implementation of special requirements with regard to probe contamination and fogging by way of multiple coordinated temperature cycles, i.e. minimum residual migration
Optimised talcum coating with high process security in accordance with the customer requirement and in line with the "as little as possible, as much as necessary" motto
Based on the decades of experience with our customers, we recommend the use of high temperature vulcanised silicone rubber. Hoses with high temperature vulcanised silicone rubber have excellent diameter consistency, an even distribution of wall thickness across the circumference, no particle adhesion and a smooth and spot-free surface. Based on the multiple stage manufacturing procedure in combination with internal compounding, the typical silicone "stickiness" can be avoided and a consistent high puncture strength can be ensured without the limitation of material or manufacturing related holes. In addition, these high temperature vulcanised hoses are easy for the producer to handle and effectively processed.

In part, the probe department has been furthered by some OEM protective sleeves with LSR coatings (LSR = Liquid Silicone Rubber). Of course, BIW also offers products on the basis of this liquid silicone treatment in order to meet the market requirements of all customers. A range of LSR probe hoses is currently
available with nominal widths of 3 to 16 millimetres. The currently specification requirements are thus easily met.

Probe hoses are experiencing a consistent increase in demand at BIW. And in order to meet both the increased quantities and the higher quality requirements, BIW is constantly investing in capacity and development. Alongside the current expansion of our knitting department with a capacity adaptation to include an additional ten production lines (see photograph), we also implement a range of measures to increase process performance and performance.  With the KAIZEN and LEAN production tools at our disposal, we are also able to meet the economic requirements of the market successfully. Our development department is also working on new qualities and products for future probe applications.

The BIW team is happy to support you in new tasks with test samples, data sheets or additional  measurements from our internal certified laboratory.

Why not speak to us and challenge our competences.

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Jul 29, 2016


Processing of optical Liquid Silicone Rubber (LSR) – an alternative to highly transparent thermoplastic and glass

The economic production of complex geometries in the silicone moulding process is well known. Optical liquid silicone types vulcanised to highly transparent elastomers represent new process challenges and alternatives. Optical silicone is an excellent alternative for the industry to glass and highly transparent thermoplastics such as PC or PMMI.

As well as the extremely positive mechanical properties, such as ageing and permanent temperature resistance up to 200 °C, particularly the transmission values and light refraction index are highly significant in the crystal clear application. Optical silicone is furthermore electrically insulated, water repellent and flexible at low temperatures.

LSR crystal clear – a new market potential for various industries.

The scope of application particularly comprises fibre optics for the automotive industry, LED components, Xenon  headlights, mobile phone cameras, street lighting and products for sensor technology. Moreover, the production of  lenses and other optical elements will be realised with silicone components in the future.

Transparent standard  thermoplastic and silicone materials generally tend to become yellow. Chemical processes are the reason for the discoloration. It is the nature of things. During the past years, some silicone manufacturers have addressed this topic in depth and have developed special formulas for these applications.

Advantage: crystal clear material for life, good transmission and light refraction values for optical fields of application.

The LSR components available in the market are generally produced in the LSR injection moulding process and are available in A and B component quantities of 20 and 200 kg. The difference from optical silicone is viscosity so that the optical LSR materials are low-viscous at room temperature when delivered - i.e. liquid, like water. This complicates processing and creates particular challenges for the injection moulding process.

Due to the high optical quality  requirements for the components, the handling of the article is an important step in the process chain. Automatic  extraction devices at the machine facilitate the handling.

The requirements for the optical surfaces demand enormous precision and purity with respect to tools as well as during production. BIW moulding has access to a clean room according to ISO 14644-1 Class 7 for this application.

Please contact us directly if you have questions regarding optical silicone. We are happy to develop the optimal solution also for your project – THAT‘S CRYSTAL CLEAR!

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Jul 29, 2016

HOT WATER AND KTW A sure thing with silicone piping of quality type SANIBIW WB

In November 2015, BIW finalised a successful own development with a certificate from the Hygieneinstitut in Gelsenkirchen. With the designation, SANIBIW WB, BIW is now able to offer silicone piping which meets all of the categories of the current KTW (Kunststoffe und Trinkwasser / Plastic and drinking water) guideline of the German Federal Environmental Agency  (Umweltbundesamt) for cold water (23 °C) and hot water (65 °C). This includes the first and most critical category "Pipes < 80 mm". For this category, the relationship between volume and surface is most unfavourable for migrative constituents from silicone into the drinking water.

BIW has succeeded in developing a mixture which meets the strict requirements of the KTW in this category. The Hygieneinstitut has, to this end, issued an appropriate certificate in accordance with the analysis and test report. What is special about the SANIBIW WB is the fact that the price-performance ratio is convincing since the own development uses a platinum-catalysed integration system which enables an economic advantage over the current benchmark.

Silicone piping of quality type SANIBIW WB may now  be used, with KTW approval, for many drinking water applications. These include, for example, connection pipes in large kitchens, shower pipes in sanitary areas plus special feed pipes in the food industry. The specifications in this application also increasingly demand the fulfilment of the KTW guideline for pipes < 80 mm in the hot water sector. Materials such as EPDM or PVC are not longer able to meet these requirements. Silicone piping of quality  type SANIBIW WB offers a clean solution.

Colours and reinforced pipe systems are no problem for BIW, since the materials used by BIW are qualified accordingly. FDA and BfR conformity is one of the basic requirements for KTW applications and this has naturally been taken into account. The recommended polyester to be used as armouring material is designed specifically for KTW applications. For any additional questions with regard to potential versions, please get in touch with your contact person.

With silicone pipes of quality type SANIBIW WB you are always making a good decision when it comes to KTW applications for the hot water sector.

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About us

Company details

Founded: 1971

Silicone rubber extrusions, silicone mouldings, silicone sealing frames, glass fibre braided and knitted sleevings with coating, cable protection systems

Silicone tubes and profiles, tailored seals, fabric-reinforced silicone pressure tubes, silicone foam seals, LSR injection
moulded parts, silicone coated glass fibre protection and insulating sleevings, protective hoses made from PA6.6, PES,
aramid and special fibres, PU/Acrylic impregnated/coated insulating sleevings

Employees: 450 (status in 2016), 16 trainees

Turnover: 64.0 million euros (status in 2015)
Worldwide sales, approximately 20% export quota outside the EU

Production space: 34,000 m2

Machine park:
40 Extrusion lines                                  
  8 Die cutters                                          
24 Injection moulding machines               
  4 Compounders/rolling mills                  
20 Impregnation lines                             
  4 Conical twin silicone mixer                 
  4 Compression moulding systems         
12 Tempering/vulcanisation ovens         
  6 Film-splicing vulcanisation systems       
60 Braiding systems                              
20 Cutting systems                               
60 Knitting and weaving systems           

Special features:

Technology centre with development, laboratory and technology rooms
own sampling department with 4 extusion lines (vertical & horizontal), own tool design
own jig manufacturing, own plant engineering
Own silicone mixing technology (compounding)
Own tailoring

Management system:
Quality, environmental, energy and personnel management system
certified in accordance with ISO 9001, ISO/TS 16949, ISO 13485
ISO 14001 (environment) and ISO 50001 (energy)
IIP (Investors in People – certified personnel development)
secure forwarder, LBA certified (Federal Office of Civil Aviation - FOCA)

Flexible, customer article specific individual, small and large scale series production,
Consistent implementation of continuous improvement processesin accordance with the “KAIZEN” philosophy

BIW provides individual consultation for in excess of 2,500 current customers. They are recognised problem solvers,
producing more than 146,000 environmentally-friendly, customer-specific, quality products at a high level in conjunction
with a team of trained and motivated specialists operating in Germany on the basis of certified, slim line processes.
They offer market-tailored prices with great flexibility, excellent service and attractive delivery times worldwide.
When it comes to competence.

DUNS: 317 145 852

VAT ID: DE 126 45 11 84

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Company data

Sales volume

20 - 100 Mill. US $

Export content

max. 25%

Number of employees

101 - 500



Area of business

Semi-finished products, technical parts and reinforced plastics

Target groups
  • Chemical industry
  • Rubber manufacturing / processing
  • Machinery construction
  • Vehicle construction / aerospace
  • Electronics / electro technology
  • Medical technology / precision engineering / optics
  • Energy technology / photovoltaics

Company information as a PDF file