Co-Extrusion – No Other Topic Has So Many Layers

Multilayer tubing offers a modern, effective and practical solution for various applications in medicine.

Especially for standards and production technologies of medical systems which require the use of several materials.

The benefits at a glance:

  • Multilayer extrusion of up to four materials
  • Very good compatibility in the body as well as with the flow-through medium
  • Distribution of layer thicknesses according to application
  • Embedding of several color and x-ray contrast stripes
  • Integration of functional layers, e.g. for light protection properties or gas barriers
  • Use of bonding agents for incompatible polymers against delamination

Examples of relevant materials are:

  • Polyethylene (PE)
  • Polypropylene (PP)
  • Polyvinyl chloride (PVC)
  • Ethylene vinyl acetate (EVA)
  • Polyamide (PA)
  • Polyurethane (TPU)
  • More thermoplastic elastomers (TPE)

Examples for typical combinations (inner/middle/outer) are:

  • PE / EVA / PVC – Your all-rounder in oncology and pain management: inert & light-absorbing
  • TPE / Soft-PP / TPE – Connector tubes for infusion and dialysis bags: flexible & cost-efficient
  • PE / PUR – Your reliable companion for insulin treatment: minimal loss of active ingredients

Light Protection and Drug Compatibility

RAUMEDIC RAUSORB – for light-sensitive solutions

  • Physiologically harmless inner layer
  • Filter effect created by dyeing the outer layer
  • Transparent coloration allows particles and air bubbles to be detected in the tube

RAUMEDIC RAUINERT – for a dosage of sensitive drugs without loss

  • Practically no migration from the tube material into the solution
  • No loss of active ingredients through adsorption

RAUMEDIC RAUSONERT – dosage of light-sensitive solutions without loss

  • Advantages of RAUSORB and RAUINERT united in one tube

The definition of dimensions, color, formulation, as well as hardness according to your specific requirements.

Tubes in the Smallest Dimensions - Micro Co-Extrusion

The so-called minimally invasive surgery is asking for increasingly complicated catheters in order to treat patients with care. Even in diagnostics, miniature tubes are used more and more due to sample quantities becoming continually smaller.

We manufacture custom-made multilayer tubing with up to four different materials. The smallest internal diameter for micro tubes that we have realized so far is around 0.1 mm [0.004 in], with an exterior diameter of 0.6 mm [0.02 in].

We would be glad to develop other dimensions together with you.

2 Materials

Application: Insulin treatment

  • Outstanding insulin compatibility (PE)
  • Transparent, flexible, solvent bondable (TPU)

3 Materials

Application: Percutaneous transluminal coronary angioplasty (PTCA)

  • Good weldability (PA)
  • Lubricity and abrasion-resistance (PE)
  • Connection of both materials with bonding agents (layer thickness ca. 0.005 mm [0.0002 in] / 5 µm)

4 Materials

Application: Regional anesthesia

  • Stability for insertion and kink-resistance due to good rigidity (PA)
  • Local anesthetics are adsorbed only to a small degree (PA)
  • Good printability (TPU)
  • Higher flexibility after application (PUR)

Connector Tubes for Infusion and Dialysis Bags

We will combine up to three individually formulated polymeric compounds. The benefits at a glance:

  • Tight, secure fit of the connectors made of diverse materials such as PC and PP after autoclave treatment/ steam sterilization
  • No delamination of individual layers
  • Adhesives for bonding of connectors are not required
  • Processability on all current types of assembly machines
  • High degree of dimensional stability ensures the stability during your production process
  • Optimally weldable with all common market types of foil
  • Dimensions and material formulations according to customer requirements


Learn more about lay flat tubing

Do you work under high pressure?

Are you looking for high-pressure tubes that stand up to the highest demands?


More about high pressure tubing