Manufactures rubber molded parts and rubber-to-metal bonds to customer specifications, from one-off pieces to large-scale series.

Grahneis GmbH

MelleNew on Amplifa

Over 100 yearsCompany tradition in rubber processing

1997First certified to ISO 9001

1,000 × 1,000 mmLargest tool clamping areas

down to 50 µmTolerances

up to over 100 kgComponent weight

Rubber Technology from Melle

Grahneis GmbH, based in Melle, is a specialist in rubber molded parts and rubber-to-material bonds with a tradition of more than a hundred years in rubber processing. The company produces custom elastomer precision parts with tolerances down to 50 micrometers as well as composite articles in which rubber is durably vulcanized onto cast iron, aluminum, stainless steel or plastics. Production takes place on injection molding machines and compression presses with tool clamping areas up to 1,000 × 1,000 mm; the product range spans from pump membranes weighing only a few tenths of a gram to bonded assemblies weighing more than 100 kg. Proprietary material formulations and elastomer compounds are adjusted as required to hardness levels between approximately 15° Shore A and 95° Shore D. Customers come from the pharmaceutical and food industries, aerospace (including MT Aerospace AG), agricultural machinery, metrology and control instrument technology, and plant engineering.

Site: Melle
Processes: Production of rubber molded parts (vulcanization), Production of rubber-to-metal bonds (vulcanization), Production of rubber-to-plastic bonds (vulcanization), Development of custom elastomer products and material formulations, First-article inspection and final inspection, Development of custom products, Consulting on material selection and formulation development, First-article inspection with test reports
Materials: Natural rubber, Nitrile butadiene rubber, Styrene butadiene rubber, Ethylene propylene diene rubber, Chloroprene, Fluoro rubber, Silicone rubber, Butyl rubber
Certificates: DIN EN ISO 9001:2015, ISO 9001
Industries: Pharmaceutical industry, Food industry, Aerospace industry, Agricultural machinery, Metrology and control instruments, Plant engineering

01
Consulting and development of custom products
02
Material selection and creation of proprietary formulations
03
Toolmaking
04
Production of rubber molded parts and composite articles (injection/compression)
05
First-article inspection with test reports
06
Series production
07
Final inspection

Locations

Melle

Manufacturing and administration

Part weight / size: from a few tenths of a gram to over 100 kg
Lot size: One-off pieces to millions of units
Materials: Elastomers (NR, NBR, SBR, EPDM, CR, FKM, MVQ, IIR, AU, CSM), rubber-to-metal bonds with cast iron, aluminum

Injection molding machine
Compression press (tool clamping areas up to 1,000 × 1,000 mm)
Photovoltaic system (1,000 m²)

Components

**Bellows**Rubber molded part · Industry

**Miniature seals**Rubber molded part · Precision engineering

**Blue rings**Rubber molded part · Series production

**Rubber-to-metal bond**Vulcanization · Plant engineering

**Threaded seal**Rubber molded part · Water supply

Inside the production

Industries

Pharmaceutical industryFood industryAerospace industryAgricultural machineryMetrology and control instrumentsPlant engineeringDrinking water fittingsAutomotive supplyWater/gas supply (drinking water fittings)Promotional items

Processes & technical limits

Processes	Tolerance	Max. part	Weight	Lot size	Materials
Production of rubber molded parts (vulcanization)Plastics	down to 50 micrometers (a few hundredths of a millimeter)	–	a few tenths of a gram	One-off piece – Millions of units	Natural rubber (NR), NBR, SBR, EPDM, CR, FKM, MVQ, IIR, AU, CSM
Production of rubber-to-metal bonds (vulcanization)Joining	–	–	more than 100 kg	One-off piece – Series	Cast iron, Aluminum, Stainless steel, Rubber/elastomers
Production of rubber-to-plastic bonds (vulcanization)Joining	–	–	–	–	Plastics, Rubber/elastomers
Development of custom elastomer products and material formulationsEngineering	–	–	–	–	Elastomers
First-article inspection and final inspectionTesting	–	–	–	–	–

2 Anlagen & Maschinen

Machine	Manufacturer / model	Quantity	Working area	Year built	Site
Injection molding machine	–	–	Tool clamping areas of the largest machines: 1,000 x 1,000 mm	–	Melle
Compression press	–	–	Tool clamping areas of the largest machines: 1,000 x 1,000 mm	–	Melle

Additional services

Development of custom productsConsulting on material selection and formulation developmentFirst-article inspection with test reportsFinal inspectionVulcanization of rubber-to-metal and rubber-to-plastic bonds

Reference customers

MT Aerospace AG

Quality

Quality management has been continuously certified to DIN EN ISO 9001:2015 since 1997 (TÜV NORD CERT, No. 44 100 210896). First articles are produced with detailed test reports before every series production; final inspection ensures tolerances down to 50 micrometers.

Evidence	Melle
ISO 9001

History

Tradition of over one hundred years in rubber processing
1997
Quality management first certified to ISO 9001, continuously certified ever since
2024
Re-certification to DIN EN ISO 9001:2015 by TÜV NORD CERT, valid until 2027-08-24