bock machining gmbh

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    • CONTACT
    • HISTORY
    • PHILOSOPHY
    • QUALITY AND CERTIFICATIONS
  • PRODUCTS
    • Shaft seal
      • Solid Radial Shaft Seals with Single or Multiple Sealing Lips
      • Radial Shaft Seal with Stainless Steel Housing
      • Radial Shaft Seal Elements with Flushing or Leakage Port
      • Radial Shaft Seal Elements with Pressure-Relieved Sealing Lips
      • Shaft Seal made of UHMW-PE
      • Shaft Seal, porous
      • Radial Shaft Seal with Shaft Sleeve
    • BELLOWS
      • PFAS-Free Bellows Made of UHMW-PE
      • Replacement for Bellows Made of PTFE Compounds
      • Bellows with Metal Insert
      • Rubber belows
    • DIAPHRAGMS
      • Machined Diaphragm
      • Die-Cut Diaphragm Made of UHMW-PE
      • Molded Diaphragms
      • Stamped Diaphragm
    • Plastic Lines
    • PISTON AND ROD SEALS
      • Spring-Energized U-Cup Seal
      • O-Ring-Energized U-Cup Seal
      • Memory Seals
      • Dry-Running Wiper Seals
      • Piston Ring
      • Complete Piston Assembly
    • SPECIAL SEALS FOR PAINTING TECHNOLOGY
      • Needle seal
      • Hose Pig
      • Control Piston
      • Needle Caps
      • Gate Valve Seals
    • VALVE SEAT, VALVE PLUG
    • PLAIN BEARINGS AND GUIDE ELEMENTS
      • Plain bearings and guide elements made from high-performance plastic.
      • Plain Bearing with Integrated Seal
      • Shift Gates
      • Trapezoidal Lead Screw Nuts
      • Plastic Coating
    • PLASTIC TURNED AND MILLED PARTS
    • ASSEMBLIES
      • Kolbenstangen-Führung
      • Gas Control Valve
      • Wiper Assembly
    • METALLIC SOFT SEAL
  • MATERIALS
    • Organor® – PFAS-Free High-Performance Plastics
      • UHMW-PE Ultra-High-Molecular-Weight Polyethylene
    • Enduflon® – Fluoropolymers
      • Enduflon V: PTFE – Polytetrafluorethylene
      • Enduflon M: Modified types of PTFE
      • Enduflon C: Compounds (mixtures) containing PTFE
      • Enduflon E: Paste-extruded PTFE grades
      • Enduflon T: Thermoplastic fluoropolymers
    • Naturon® – Bio-based Plastics
    • Oecomach® – Recycling of Plastic Waste Chips
    • Important Engineering Plastics and High-Performance Plastics
      • PE – Polyethylene
      • PEEK – Polyetheretherketone
      • PEI – Polyetherimide
      • PET – Polyethylene terephthalat
      • PPS – Polyphenylensulfide
      • PSU – Polysulfone
      • UHMW-PE Ultra-High-Molecular-Weight Polyethylene
    • MOCA Declaration of Conformity
  • INDUSTRIES
    • Food Industry
    • Beverage Industry
    • Painting and Adhesive Technology
    • Medical Technology and Pharmaceuticals
    • Rotary Joints
    • Pumps and Compressors
    • Valves and Fittings
    • Laboratory Technology and Analytics
    • Bulk Material Handling
  • SERVICES
    • Development and Design of Seals
    • Design and operation of test rigs
    • Failure analysis of seals
    • Conversion to PFAS-Free Seals

    • CNC manufacturing of plastic components according to drawing
  • BLOG
    • Permeation of UHMW-PE: Requirements in the Beverage Filling Industry
    • PFAS – the next Asbestos?
    • 3M’s Exit from PFAS
    • Hydrogen seals
    • PFAS: The restrictions could go even further.
    • “Elastic” Bellows and Diaphragms Made of PTFE
    • Plastic plain bearings with minimal play?
    • What can a product line made of pure PTFE do?
    • Does a scraper really remove “everything”?
  • WEBINARS
    • Live Recording » Webinar 1: The Use of PTFE in Specialized Sealing Technology
    • Live Recording » Webinar 2: UHMW-PE—The Underestimated Material
    • Live Recording » Webinar 3: Design of PTFE Bellows
    • Live Recording » Webinar 4: How to Design Membranes Made of PTFE and UHMW-PE?
    • Live Recording » Webinar 5: The Mantle Ring – “The Sealing of Horror”
    • Live Recording » Webinar 6: Sealing Hydrogen. How Does It Work?
    • Recording of Webinar 7 » PFAS-Free Alternative Materials to PTFE
    • Live Recording » Webinar 8: PFAS—What Action Is Needed in Sealing Technology?
    • Live Recording » Webinar 9: Design of Bellows and Diaphragms Made from UHMW-PE, a PFAS-Free Alternative Material
  • PFAS
  • CAREERS
    • EDUCATION
    • FINAL THESES
  • English
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    • Italian
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Plastic Lines

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Stefan Bock
Friday, 21 August 2026 / Published in Products
Formed PFAS-Free Plastic Lines Made of UHMW-PE
We develop and manufacture custom lines made of modified polyethylene. To flexibly connect process connections for liquid media in beverage processing, the food industry in general, the pharmaceutical industry, and the chemical industry, prefabricated PTFE-lined hose assemblies have traditionally been used. A one-piece, thick-walled hose made of ultra-high-molecular-weight polyethylene eliminates the disadvantage that leakage is
CablesPFASUHMW-PE

Hose Pig

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Stefan Bock
Friday, 21 August 2026 / Published in Special Seals
Pig for Paint, Solvents, Adhesives, Hardeners, UV Coatings, Control Air, Oil-Free Air, Cleaning Agents, Acetone, MEK, and Thinners
Flushing pistons that are propelled through hose lines are called “pigs.” They provide clean separation between the preceding paint and the solvent, air, or subsequent paint. This results in extremely short paint changeover times in automated systems, minimal paint waste, minimal solvent consumption, and excellent process quality. Rubber pigs often reach their limits at high
PTFESealsUHMW-PE

Control Piston

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Stefan Bock
Friday, 21 August 2026 / Published in Special Seals
Control Pistons Made of PTFE, TFM, or Polytetrafluoroethylene, UHMW-PE, or Ultra-High-Molecular-Weight Polyethylene
In paint spray guns, a distinction is made between horn air and atomizing air. The needle, on the other hand, is actuated by control air. This acts on a piston against a preloaded spring. Control pistons are also required in paint valves. These are often complex assemblies with numerous seals and channels that separate the
PTFESealsUHMW-PE

Needle Caps

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Stefan Bock
Friday, 21 August 2026 / Published in Special Seals
Needle Cap with Diaphragm or Bellows for Needle Valves
Paint valves often seal using valve seats with conical sealing surfaces. A hard/soft combination with a stainless steel valve seat has proven advantageous. The correct selection of the plastic’s strength (PVDF, PEEK, UHMW-PE) is critical and depends on the closing force of the piston. With the aid of a metal carrier onto which a plastic
PTFESealsUHMW-PE

Gate Valve Seals

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Stefan Bock
Friday, 21 August 2026 / Published in Special Seals
Gate valve seal for paint, solvents, adhesives, hardeners, UV coatings, control air, oil-free air, cleaning agents, acetone, MEK, and thinners
To seal lateral movement between flat surfaces, we have developed various types of gate valve seals that meet all the requirements for lubrication-free sealing. This enables tolerance compensation, low friction, minimal dead space, LABS-free performance, and reliable continuous operation. Machining also makes it possible to accommodate virtually any installation space and develop a backward-compatible sealing
PTFESealsUHMW-PE

O-Ring-Energized U-Cup Seal

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Stefan Bock
Friday, 21 August 2026 / Published in Piston and Rod Seals
Sealing Ring with O-Ring Made of FKM, FPM, Viton®, EPDM, Silicone, VMQ, or HNBR
Comparable to spring-energized U-cup seals, but without dead space. If the groove of the U-cup seal is to be avoided in applications involving paint or food products, an O-ring can be used as the energizing element instead of a spring. Particular attention must be paid to preload, elastomer quality, and Shore hardness. Due to the
SealsU-Cup SealsUHMW-PE

Spring-Energized U-Cup Seal

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Stefan Bock
Friday, 21 August 2026 / Published in Piston and Rod Seals
Spring-Energized U-Cup Seals for Radial or Axial Sealing, or as an Alternative to EFN, URS, URI, URA, CRS, and Gaspring
This is a proven design principle in which the chemically resistant, low-friction jacket made of polytetrafluoroethylene or ultra-high-molecular-weight polyethylene is energized by a stainless steel spring. This gives the U-cup seal elasticity, provides a low initial contact force, and allows the sealing force to increase with system pressure. Low-friction designs are possible, as are applications
PTFESealsU-Cup SealsUHMW-PE

Piston Ring

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Stefan Bock
Friday, 21 August 2026 / Published in Piston and Rod Seals
Piston Rings – PFAS-Free Alternative Made of Modified Polyethylene
For use in a dry-running compressor or gas compressor, piston rings made of PTFE compounds are essential. They operate without oil, thereby preventing contamination of the gas being compressed. During the manufacturing process, they are precisely formed to match the cylinder diameter, ensuring proper contact with the cylinder wall from the outset. Due to the
SealsUHMW-PE

Replacement for Bellows Made of PTFE Compounds

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Stefan Bock
Friday, 21 August 2026 / Published in Bellows
PFAS-Free Bellows Made of Polyethylene
With PTFE bellows, it was previously possible to reinforce highly stressed areas with PEEK. It also made sense to use compounds for wrench flats, threads, and guide surfaces. When using PFAS-free bellows made of polyethylene, this is no longer necessary. Due to the strength of the alternative materials Endulfon P1 and P16, one-piece bellows can
Alternative MaterialsCustom-made bellowsPFASSealsUHMW-PE

Solid Radial Shaft Seals with Single or Multiple Sealing Lips

  • 0
Stefan Bock
Thursday, 20 August 2026 / Published in Shaft seals
Radial Shaft Seals Made of PFAS-Free Materials
A so-called solid radial shaft seal is machined from tube or solid stock and formed to the nominal shaft diameter so that it can also be optimized for low friction. The sealing lips can be designed to face either the same or opposite directions, allowing two media to be separated (e.g., food products from gear
PFASSealsUHMW-PEWDR
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Alternative Materials Baugruppen Beverage Filling Industry Blog Cables Custom-made bellows Development and design engineering Diaphragm Diffusion Failure analysis of seals Guide elements High-performance plastic Hydrogen Konformitätserklärung Live Material Analyses Materials MOCA Operation of test rigs PE PEEK PEI Permeation PET PFAS Plain bearing Plastics Polyester PPS PSU PTFE Seals Services Shift Gates Technical Plastics the food Thermoplaste U-Cup Seals UHMW-PE WDR Webinars Wiper Seals
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