Elastocon Accredited Testing Services

Elastocon performs contract testing and consultancy assignments in rubber and plastic. Our specialities are ageing tests, estimation of lifetime and testing of low temperature properties on rubber materials.

Swedac 1678 accredited testingWe have been accredited for 15 rubber testing methods, see our Testing Overview. It is SWEDAC, the Swedish Board for Accreditation and Conformity Assessment, that performs the accreditation. SWEDAC’s website says the following about what it means:

“To be accredited, skills, procedures and methods are tested so that all quality requirements are met as a standard. Next, Swedac check regularly that the company continues to meet the requirements for their accreditation.

The purpose of accreditation is to ensure that certification, inspection and testing is done with high quality and safety for life, health and environment. Accreditation means that inspections are performed impartial, accurate and based on internationally recognized standards.”

See Elastocon's accreditation certificate from Swedac for our testing services here.

For polymer testing inquiries and quotations please contact Elastocon by email:

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Estimation of lifetime from relaxation tests

Stress relaxation tests are ideal for making lifetime estimations using an Arrhenius plot. How to do an estimation of lifetime of rubber materials using an Arrhenius plot is described in the standard ISO 11346.

When doing an Arrhenius plot, tests are made of a critical property at different times and at least at three test temperatures. The tests are normally run until the properties are reduced to 50 % of the original value, see figure.

Click images to enlarge.

The time to reach this level is determined for each temperature.

The test temperatures are chosen so the test time for the highest temperature is at least one week and the time for the lowest temperature is about 3–9 months.

The times to reach the ”end of life” time for each temperature are plotted in an Arrhenius plot, which is a graph with logarithmic time on the Y-axis and 1/T on the X-axis, where T is the temperature in Kelvin, see figure.

A straight line is drawn through the points and extrapolated to the temperature of use, to obtain an estimation of the life-time of the tested material.

Low temperature testing

elastocon low temp testing

Elastocon performs three important standardised low temperature test methods for rubber materials:

Hardness testing

The rubber’s hardness or stiffness (modulus) is determined by measuring how far a blunt measuring probe can be pressed into the rubber.

Originally there were several methods for hardness measuring, today however there are mainly two methods used, and a third for measuring hardness on big rubber covered rolls.

  • Shore ISO 48-4
  • IRHD ISO 48-2
  • Pusey & Jones ISO 48-8

Tensile, compression and tear testing

elastocon tensile testingTensile testing according to ISO 37 is normally used to determine the following properties of rubber materials:

  • Stress at a particular elongation, e.g. 100 % or 300 %, expressed in MPa, is sometimes called the “rubber modulus”.
  • Tensile strength in MPa, which is the strength at break.
  • Elongation at break in %.

Compression testing according to ISO 7743 measures the rubber’s stiffness, spring constant or modulus. It can be done in modern tensile testers, which can be used in both tension and compression. The normal method is to deform the rubber by 25 % and measure the force.

Tear testing according to ISO 34 determines the tear resistance of the material. Three methods are common, namely:

  • Trouser test piece (method A)
  • Angle test piece (method B)
  • Crescent test piece (method C)

Material analysis

Elastocon Material AnalysisElastocon have increased the number of test methods in our test lab with analysis of polymer materials.

TGA 4000 can be used for determination of the composition of vulcanizates and uncured compounds by thermogravimetry according to ISO 9924. The standard specifies a thermogravimetric method for determination of the total organic content, carbon black content and ash.

DSC 4000 is an instrument for differential scanning calorimetry (DSC). It can be used for determination of melt interval and phase transitions.

FTIR (Fourier Transform Infrared Spectroscopy). FTIR is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid or gas. A FTIR spectrometer simultaneously collects high-spectralresolution data over a wide spectral range. The method is ideal for qualitative analysis of polymeric raw materials and finished products.

TCi is a thermal conductivity meter from C-Therm. It can measure thermal conductivity and effusivity on all types of materials, such as solids, liquids, powders and pastes, according to ASTM D7984.

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