Elongation at break

#1 What is elongation at break?

The elongation at break reflects the ability of materials to deform.

In the case of O-rings, the elongation at break is determined by means of the world-famous tensile test using a material sample. The sample is clamped in a machine and stretched until it tears. The extent to which the sample could be stretched is then tested.

The elongation at break is given as a percentage on each data sheet.

Example: If an O-ring material has an elongation at break of 100%, then the material could be stretched to twice its length.

#2 Which O-ring material has which elongation at break?

Material

Hardness

Elongation at break

Tear resistance

FFKM

75 Shore A

145%

18.0 MPa

FKM (Viton)

75 Shore A

183%

14.9 MPa

FEP/FKM

90 Shore A

250%

21.4 MPa

PTFE

60 Shore D

250%

24.5 MPa

Silicone

70 Shore A

261%

6.1 MPa

HNBR

70 Shore A

274%

18.0 MPa

EPDM

70 Shore A

282%

10.9 MPa

FVMQ

70 Shore A

285%

7.6 MPa

NBR

70 Shore A

389%

14.4 MPa

The mechanical load capacity of the O-ring material can be easily read from the table.

Analysis of the table
In general, it can be said that a high elongation at break results in a low tensile strength (e.g. VMQ (silicone) or FVMQ). Against this background, NBR and HNBR stand out in particular.

HNBR and NBR O-rings have both a very high elongation at break and excellent tear resistance. This is also the reason why NBR or HNBR O-rings are used when there is a high mechanical load. 

Note: The FEP/FKM and PTFE O-rings must be considered separately in this table, as they are not elastomers like the other materials. FEP encapsulated O-rings are a combination product made of thermoplastic (FEP encapsulation) and elastomer (FKM core). PTFE is a duromere.


DO YOU HAVE ANY QUESTIONS?
THEN PLEASE WRITE TO US!

Kai Becker Mitglied des Teams NH O-RING

Please send me your request and I will take care of your offer as soon as possible.

AVAILABLE O-RINGS
0
MINUTES OFFER TIME
0
NH O-RING hat 4,75 von 5 Sternen 457 Bewertungen auf ProvenExpert.com