Construction with plastic guides

Chain, belt, and sliding guides by Murtfeldt

Construction using thermoplastics requires careful consideration beforehand. The conditions of use have a direct influence on the material selection and design of the plastic guides. You should answer the following questions in advance:

  • To what static and dynamic loads will the guide be exposed?
  • To what environmental factors, such as chemicals, hot or cold water, steam, or contaminants will the material be exposed?
  • Will there be direct contact with foods?
  • How high is the working temperature?
  • How is the guide to be attached to the C profile (screwed on or inserted)?

In comparison with metallic materials, thermoplastics have a higher coefficient of linear thermal expansion.


When calculating the expansion, the anticipated difference between the assembly and minimum and maximum working temperatures is to be taken into account. The coefficient of linear thermal expansion of the material is used to precisely calculate the maximum elongation when the temperature rises and the reduction when the temperature drops (see formula below). The required movement space for the material can thus be taken into account before installation takes place. There are different fastening options depending on the application.

Formula for calculating elongation:

ΔL = L x α x ΔT


ΔL = Elongation
L = Initial length
α  = Coefficient of linear thermal expansion
ΔT = Temperature difference in °C

The Murtfeldt Plastic Guide

The Plastic Guide is the first application to offer users in the form of an app free and interactive support when selecting technical plastics for use in industry.

Learn more ...

Resistance to chemicals

Learn more about the chemical resistance of our plastics.

Resistance to chemicals