Physical properties

Abrasion resistance
Baypren^® vulcanizates are highly wear-resistant. Their abrasion resistance is similar to that of nitrile rubber.

Resilience
Suitably formulated Baypren^® vulcanizates possess very good resilience although they do not attain the level of natural rubber. Very good resilience values are achieved in vulcanizates with a relatively high hardness.

Dynamic fatigue resistance
Baypren^® vulcanizates are highly resistant to dynamic fatigue. Special grades are available to meet extremely stringent specifications, such as those applied to drive belts. The loss factor and hence the heat build-up under dynamic load are low.

Deformation properties
Baypren^® vulcanizates have a low compression set over a temperature range of -10 to +145 °C. The low-temperature compression set is a key value employed in the assessment of vulcanizates for use in seals. At higher temperatures, where aging also plays a role, the compression set curves are lower than those of a large number of other elastomers.

Combustion behavior
Baypren^® vulcanizates can be compounded for improved combustion behavior. The good combustion behavior of the polymer itself means that even stringent end user specifications can be met. Limiting oxygen index (LOI) values in excess of 50 % can be attained with Baypren^®. The requirements placed on the flame retardance of conveyor belts for underground mining applications can be met with properly compounded Baypren^®.

Gas permeability
Baypren^® vulcanizates have a very low gas permeability, which is roughly equivalent to that of nitrile rubber.

Low-temperature flexibility
The glass transition temperature of unfilled Baypren^® polymers remains fairly constant at around -34 °C, almost irrespective of the polymers’ tendency to crystallize. The brittleness temperature and the glass transition temperature of Baypren^® vulcanizates can be reduced to below -50 °C by appropriate compound formulation. Where rubber parts made of Baypren^® are required to remain flexible at low temperatures over long periods, grades with a low crystallization tendency are recommended.

Electrical properties
Baypren^® is highly suitable for cable sheathing and, in many cases, for low-voltage insulation. It is recommended for use in cables that must have resistance to weathering, ozone, oil and aging as well as good combustion resistance.