Compound comparison chart

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COD Sogimi
Basic Elastomer
Softness degree
Density lb/ft3.
Heat resistance °F
In-house fire resistance tests
Regulations, Certificates, and Standards
NR + SBR
Hard
510 +/- 50
- 30 / + 80
Tested according to UL94HBF standards ≥ 4 mm
Tested according to Ul94 FDA-compliant: CFR 21 Cap.I Sub. B: Part 177, 182, 184
NR + SBR
Hard
350 +/- 50
- 30 / + 80
FDA-compliant: CFR 21 Cap.I Sub. B: Part 177, 182, 184
EPDM
Soft
95 +/- 25
30
Tested according to UL94HBF standards ≥ 9 mm
EPDM
Soft
80+/- 15
- 40 / + 100
VW TL52065 - watertight seal: 40% compression : ≥ 96 h ISO 846:2019 fungi and bacteria growth resistance test
EPDM
Soft
110
- 40 / + 135
EPDM
Soft
90
- 40 / + 135
VOC: 10 µg C/g according to VDA 277 Formaldehyde emissions: 0.0453 mg/lb. according to VDA 275 standards
EPDM
Soft
85
- 40 / + 135
UL94-certified HF-1 ≥ 10 mm
Yellow card n. E52859
EPDM
Soft
130
- 40 / + 135
EPDM
Soft
95
- 40 / + 135
EPDM + SBR
Hard
125 +/- 25
- 40 / + 70
EPDM + SBR
Media
145 +/- 25
- 40 / + 80
ISO 846:2019 fungi and bacteria growth resistance test
EPDM + CR
Media
175 +/- 25
- 50 / + 110
Tested according to UL94HBF standards ≥ 5 mm
EPDM + SBR
Media
140 +/- 25
- 40 / + 90
AfPS GS 2019:01 - cat. 1, 2 (PAH content index)
EPDM + SBR
Media
140 +/- 25
- 40 / + 90
AfPS GS 2019:01 - cat. 1, 2 (PAH content index)
EPDM
Soft
120 +/- 20
- 40 / + 110
Tested according to UL94HBF standards ≥ 3 mm
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COMPOUNDS

The selection of the most suitable gasket must consider many parameters, including:

Compression set

Measures the permanent deformation in compression that occurs with use. It’s connected to all factors that can affect the gasket’s elasticity. The lower the compression set, the greater the gasket’s ability to guarantee its sealing properties over time, as well as the dimensions (thickness and width) suitable for ensuring optimal sealing, and the mechanical, physical and chemical resistance characteristics required by the operating conditions.

Compound hardness

While elasticity is the fundamental property that makes a compound suitable for sealing applications, its hardness value defines the specific stress conditions for optimal performance. It is closely related to the pressure values exerted on the sealed element.

Aging

The aging process of an elastomer bears great influence on its sealing capacity, causing a loss of its physical and chemical features. The primary causes of this include weathering in contact with the elastomer, mechanical action, and temperature.

Operating temperature

Temperature directly affects elasticity levels. At low temperatures, compounds tend to lose elasticity, resulting in a reduction of their sealing capabilities, while at high temperatures the material becomes softer, ensuring increased surface adherence, yet resulting in more susceptibility to deformation under pressure or movement, particularly in dynamic sealing applications.

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