Tumedei employs a number of well experienced rubber technologists who optimise the performance of materials to suit individual customer requirements.

By fine tuning the physical properties to specific end use applications we can achieve significant improvements in performance.

Examples of areas where material properties can be engineered include:

  • Heat Ageing resistance.
  • Fluid Ageing resistance.
  • UV and weathering resistance.
  • Low temperature flexibility and sealing performance.
  • Coefficient of Friction.
  • Built in Compound Lubrication.
  • Drinking Water approved materials.
  • Long Term sealing performance.
  • Thermal and Electrical Conductivity.
  • Toxicity and biocompatibility.

Tumedei has a well equipped laboratory facility for testing elastomers, TPR’s and engineering thermoplastic. Testing capabilities include:

Dynamic and thermal testing

De Mattia Fatigue (ASTM D813)

  • Adjustable strain rates and ability to test fatigue from ambient to +200 deg. C
  • Used to fingerprint compounds for quality control.

DMTA – Dynamic Mechanical Thermal Analyser (e.g. ASTM D4065)

  • Subjects the polymer to a mechanical stress at different frequencies, strains and temperatures.
  • Can provide data on the effects of ageing and the amount of cure.
  • Can provide values for Tg, Tm and stress relaxation and these properties are important when choosing the correct plastic for hot water applications.

Thermal Analysis – TGA (ASTM E1131)

  • A sample is taken through a temperature sweep and the weight of the sample is monitored. As different elements of the compound volatilize, the weight is recorded.
  • Used to fingerprint compounds for quality control.

Thermal analysis – DSC (e.g. ASTM D3417)

  • Fingerprints polymers by a temperature map of their transitions: Tg, Tm, etc.
  • For determining the correct processing temperatures:- where does it melt, over how broad a range.
  • For determining the correct operating temperatures:- Where is the glass transition? Above Tg the materials are softer, below it they are more rigid. Effects end use.

Inferred Spectrometer FTIR (e.g. ISO4650)

  • Measures the absorption of IR light to determine the elements and compounds present in a material which is very useful for QC and for material identification.
  • Useful for understanding the reasons behind a product failure. For instance, when a polymer has been incorrectly exposed to a material that degrades it.

Fluid resistance (effects of liquids) as per ASTM D471

  • Customized immersion test rig with automatic temperature control and dosing of chemicals.
  • Stagnant and flowing water conditions, important for materials that develop a skin during degradation. Able to detect subtle differences in polymer types.

Mechanical Static Testing

  • Tensile Strength as per ASTM 412.
  • Tear Strength as per ASTM 624.
  • Flexural Modulus as per ASTM 412.
  • % Elongation as per ASTM 412.
  • Hardness Micro IRHD ISO48 and Shore A as per ASTM 2240.
  • Specific Gravity as per ASTM 792.
  • Compression and Tension Set as per ASTM 395.
  • Stress Relaxation as per ASTM 1646.
  • High and low temperature ageing as per ASTM 573.
  • Fluid Immersion Ageing as per ASTM 471.
  • Compound Rheology as per ASTM D2084.
  • Resilience rebound test Measure as per DIN 53512.
  • Mullen stress burst pressure test.

Product Validation Non Contact Measuring

The Tesa Visio optical measuring device for rubber parts fitted with a Rhenishaw TTP for plastic / metal parts.

Accurate to 3 microns.

Measuring process can be programmed for the best repeatability.  Can exchange files with Solidworks, allowing us to digitize parts.