Material Properties

Elastomer compression springs are standardized in DIN ISO 10069-1. Our qualities EFFBE 295 and EFFBE Urelast exceed these standards in many cases.

For the production of EFFBE spring elements, three different elastomer types are offered, in accordance with the application criteria:

EFFBE 295 CR - spring quality on the basis of chloroprene-rubber (CR), 70 Shore A, in accordance with the specifications of DIN ISO 10069-1.
EFFBE Urelast UN 80 - Tempered polyurethane rubber 80 Shore A.
EFFBE Urelast U 90 - Tempered polyurethane rubber, highly resistant to dynamic load, 92 Shore A, in accordance with the specifications of DIN ISO 10069-1.

The Essential Material Properties:

	Unit	EFFBE 295 Chloroprene rubber CR 70 / DIN ISO 10069-1	EFFBE Urelast Polyurethane rubber UN80	EFFBE Urelast Polyurethane rubber U90 / DIN ISO 10069-1
Colour		Black	Natural	Red
Hardness in accordance with DIN ISO7619	Shore A	70	80	92
Tensile Strength in accordance with DIN 53 504	N / mm²	≥12	≤50	≤40
Elongation at break in accordance with DIN 53 504	%	≥250	≥640	≥550
Tear propagation resistance in acc. with DIN ISO 34-1	N / mm	4	≤50	≤50
Rebound resilience in accordance with DIN 53 512	%	30	48	43
Abrasion in accordance with DIN ISO 4649	mm³	≤150	≥40	≤40
Compression set in accordance with DIN ISO 815-1	%	≤20	≤30	≤30
Bulk density in accordance with DIN EN ISO 1183	g / cm³	1,37	1,24	1,27
Temperature application area	°C	-20°Cto + 80°C Briefly from -40°C TO + 120°C	-20°Cto + 80°C Briefly from -40°C TO + 120°C	-20^°Cto + 80°C Briefly from -40°C TO + 120°C
Resistant to
Oil (Lubricating oil)		Adequate	Good	Good
Grease		Adequate	Good	Good
Alcohol		Good	Good	Good
Brenzene		Adequate	Good	Good
Water		Good	Adequate ^-1)	^{Adequate -1)}
Humidity		Good	Adequate ^-1)	Adequate ^-1)
Ozone		Good	Good	Adequate
Alkaline Solutions		Adequate	Adequate	Adequate
Acids		Adequate/Condtionally	Adequate	Adequate

use must be checked relative to duration, temperature and/or concentration.

* Shore hardness measured on the test sheet in accordance with DIN ISO 7619.

¹⁾Hydrolysis-resistant material on request.

Service Life

If the design criteria are complied with more than 2x10⁶load changes are possible.

Other Advantages:

Progressive characteristics curve and high load absorption, no danger of "bottoming out" as is the case with steel springs.
Excellent operational reliability through emergency running characteristics, consequently there is no tool damage at overload.
Complete freedom from maintenance offers profitability in continuous operation.
Favorable price-performance ratio compared to other spring systems.

Temperature Resistance

The operating temperature range is between -20^oC and +80^oC;

Short-term temperatures -40^oC and +120^oC are possible. The determining factors are self-warming and ambient temperature.

Diagram 2 shows the elastic behavior depending on temperature. The spring characteristic is determined by the temperature-dependant modules of elasticity, by the geometric shape and the type and size of deformation

Diagram 1