Heat resistance

Of all the demands placed on conveyor belts, heat is usually the most unforgiving and damaging. High-temperature environments accelerate the aging process, which causes the rubber to harden and crack. The three classes of resistance against accelerated aging within ISO 4195 test methods are: Class 1 (100°C), Class 2 (125°C) and Class 3 (150°C). In order to handle even more extreme temperatures at Dunlop we also carry out routine testing at 175°C.


Dunlop Betahete is a high-performance heat and wear resistant rubber compound designed to handle materials at continuous temperatures up to 160°C and peak temperatures of up to 180°C.

Betahete consistently exceeds the requirements demanded by ISO 4195 Class 2 (T125) and has an outstanding level of abrasion resistance that exceeds the international standards applicable to purely abrasion resistant belts by more than 50%.


Dunlop Deltahete is recommended for more extreme temperatures in demanding heavy-duty service conditions to convey high-temperature loads of abrasive materials. It is specifically designed to withstand a maximum continuous temperature of the conveyed material as high as 200°C and extreme peak temperatures as high as 400°C.

Deltahete exceeds the highest requirements of Class 3 and is therefore effectively Class 4, although this category does not yet exist within the ISO 4195 classifications. ISO 4195 laboratory testing has shown that even when continually exposed to 150° heat for 7 days, Dunlop Deltahete still retains its original (pre-test) resistance to abrasion.


UP TO 180°C – Dunlop Betahete: to handle materials at continuous
temperatures up to 160°C and peak temperatures of up to 180°C.

UP TO 400°C – Dunlop Deltahete: designed to withstand a maximum continuous material temperature up to 200°C peak temperatures up to 400°C.

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In this document you can find information about heat resistance.

Belt cracking due to insufficient heat resistance

Cover Qualities


Trioflex has been designed in line with the modern MPC-trend (minimum ply concept) and can be used very successfully for medium up to the heaviest service conditions, adverse loading conditions and coarse materials.