What can happen with Compounds ?
Rubber Compounds are considered a complex material that can fail for a number of reasons . Namely , they can Wear Rapidly , Deteriorate under Excessive Heat , gradually Fatigue , go Brittle , form Cracks , easily Tear , Chip and Chunk , suffer Weather Checking and they can Separate from other compounds to which they are bonded. In most Instances there may be combinations of these problems .
If compounds exhibit any of these conditions tyre life will be shortened and will cost you money . Users may not pick these problems up , as some cases require laboratory analysis to be able to assess the problem .
Shaw Tyre Services Pty Ltd can provide the appropriate Compound Testing through a recognized and reputable Laboratory Facility .
Video : Example of how Brittle a Compound can get . It loses its Elasticity .
What can we ask of Tyre Manufacturers
Get involved with OTR Tyre Suppliers to assist in Product Improvement Plans . OTR OEMs need to be committed to the Mining Industry cost reduction program.
Different Compounds in a Tyre ?
There can be as many as 20 different Compounds used in an OTR Tyre for all the various Components . Note each compound type is specifically designed with its own unique Physical Properties . So in an OTR Tyre factory there could be as many as 50-60 different ingredients being used in all these different compound formulations .
Some of these ingredients have a very short shelf life , while others require specific storage conditions , and some need well controlled processing temperatures to achieve optimum performance . This means that Quality Control is extremely important , and so an ISO Accreditation is the absolute minimum requirement to ensure all raw materials are handled properly .
This means , apart from an inadequate compound design , there are also Material and Process Problems that can arise during Manufacturing .
Compound Design for an Application.
Rubber Compounds are designed with Specific Physical properties in mind . Considerations are Good Wear , Low Heat Generation , High Tear Resistance , High Elongation at Break , Low Modulus during Extension , High Extension before Tearing , Consistent Hardness during service , Good Fatigue Resistance , Low Rolling Resistance and Resistance to Cuts , Chipping and Chunking .
It is impossible to design all these features into one single compound and hence the need for a range of Tread Compounds for various Operating Conditions . See the Compound Classifications .
Potential problems from a Survey .
Most OTR Tyres are removed prematurely since as only about 25% of all removals reach the Worn Out state . This means 75% of premature removals are either Operational or Manufacture related . Breaking early removals down further , failures can generally be split into Primary and Secondary failure modes .
Most Tyre Management companies simplify failures by quoting Primary Failure causes , so Secondary Failure reasons becomes lost information. Rock Damage can be as much as 45% of all tyre removals , so imagine if sites fixed the Rock Damage issue , and Tyre Manufacturers fixed these unrecorded Product problems . Huge Savings in tyre loss and downtime.