Rotomolded Type 4 Tank Inner Liner

  • Wide range of different dimensions possible for rotomolded type 4 tank inner liners
  • Maximum size with length of 3200mm 
  • The liners boss connector is customizable according to the customers’ specifications 
  • Length of the mold can be arranged in a modular system
  • Various successful projects realized for global OEMs, both in the hydrogen and in CNG industry
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Rotomolded Type 4 Tank Inner Liner

  • Elkamet manufactures thermoplastic liners of various sizes using rotational and extrusion blow molding processes
  • These are used, among other things, as the inner shell of pressure vessels for storing gases and liquids
  • Typical applications include hydrogen and CNG tanks
  • The thermoplastic liner serves as the inner shell
  • Mechanical strength is achieved with the aid of fiber and resin wrapping
  • One or more Boss parts are used as valve connections


  • Manufactured in rotational molding process 
  • Liner can be made out of various materials:
    • PE / XPE 
    • PA11 / 12
    • PA6
    • Materials can be chosen according to customers needs and specifications
  • Various sizes are possible
    • Maximum size with length of 3200mm
  • The liners boss connector is customizable according to the customers’ specifications
  • Length of the mold can be arranged in a modular system
  • Weight reduction compared to aluminium liner
  • Good permeation barrier

Which process is suitable for your application?

Rotationalmolding-vs-Blowmolding-type 4 tank inner liner


  • Hydrogen (H2) 
  •  Compressed Natural Gas (CNG) 
  •  Nitrogen (N2) 
  •  Gases and liquids in general

Use Cases

  • CNG liner for cars / automobile 
  • H2 liner for busses, trucks and trains 
  • Liner for aeronautics  
  • Stationary and mobile H2 storage systems 



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Technology Readiness (TRL)

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Certificate ISO 50001-2018

Certificate ISO 14001-2015

Certificate IATF 16949-2016

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    Elkamet Kunststofftechnik GmbH

    Identifying challenges, finding solutions: with our know-how and experience, we are experts in the field of tank development and manufacturing. Over the past years, we have applied our development skills into developing inner plastic liners for a variety of applications and have evolved as specialists in this area. For many years Elkamet is supplier for the inner liner of CNG tanks and in the recent years also deeply involved in many projects for H2 liners.

    From our manufacturing facilities in Wilhelmshütte (GER), Myslinka (CZ) and East Flat Rock (US) we each year supply more than 700.000 parts produced in roto- and blowmolding to our customers. All sites are certified according to IATF 16949.

    Together with you, we develop products, which offer added value and thereby positively boost your business in the long-term.

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