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Association
& Quality
UL-Listed O-Rings Overview
Underwriters Laboratories (UL) is an independent organization that evaluates and certifies products for safety and performance. For elastomeric seals like o-rings, UL 157 is the primary standard for assessing suitability under specific end-use conditions.
Achieving UL certification under UL 157 signifies that an o-ring has met rigorous safety and performance standards. This certification is crucial for industries where reliability is of the utmost importance, as it ensures the seals perform effectively in their designated applications.
UL 157 Testing Criteria
UL 157 outlines test procedures and performance criteria for o-rings. The standard evaluates elastomeric seals against several critical properties to ensure their suitability for demanding applications. Materials undergo thorough testing to ensure performance stability under accelerated aging and specific environmental conditions like chemical exposure, fuel compatibility, and ozone resistance. Key evaluated properties include:
● Compound Designation
● Maximum Service Temperature (°C)
● Minimum Service Temperature (°C)
● Hardness Range (durometer)
● As Received Tensile Strength (psi)
● As Received Elongation (%)
● Maximum Compression Set (%)
● Maximum Tensile Set (%)
● End-use Application
Material Compatibility
UL 157 certification covers various elastomeric compounds that each meet specific application criteria. Global O-Ring and Seal offers several UL-listed compounds recognized with specific end-use codes that align with UL’s stringent performance standards. The table below details Global O-Ring’s relevant compounds and their corresponding UL 157 code coverage:
|
|
|
|
|
|
|
|
|---|---|---|---|---|---|---|
| C70-B101 | Neoprene | 70 |
Black |
-40 to +212 |
 |
UL 157 |
| E70-B108 | EPDM | 70 |
Black |
-67 to +302 |
|
UL 157 |
| F70-B401 | Fluorosilicone | 70 |
Blue |
-76 to +350 |
|
FDA Compliant, UL 157 Certified |
| N50-B102 | NBR | 50 |
Black |
-40 to +212 |
|
UL 157 |
| N70-B103 | NBR | 70 |
Black |
-40 to +212 |
|
UL 157 |
| N80-B102 | NBR | 80 |
Black |
-40 to +212 |
|
UL 157 |
| S70-B602 | Silicone | 70 |
Red |
-67 to +437 |
|
UL 157 |
| V70-B101 | FKM | 70 |
Black |
-40 to +482 |
|
UL 157 |
| V75-B101 | FKM | 75 |
Black |
-13 to +482 |
|
Genuine Viton®, UL157 |
UL 157 End-Use Application Codes
A: Extinguishing agents*
B: Gasoline
C: Gasoline/Alcohol blends up to 15% alcohol*
D: Naptha or kerosene
E: MPS gas
F: Manufactured gas or natural gas
G: Diesel fuel, fuel oil or lubricating oil
H: Heated fuel oil
I: Anhydrous ammonia
J: Liquefied petroleum gas (LP-gas)
K: Dry-cleaning agents
L: Laundry detergents
M: Dishwashing detergents
N: Atmospheric ozone
O: Generated ozone
P: Propylene
R: Refrigerants*
* Refer to individual report for specific blends/agents
Certification and Inquiries
UL-certified o-rings are associated with specific file numbers or certification identifiers for transparency and verification. Global O-Ring can provide our specific UL file number upon request, and you can visit our listing on the UL Product iQ. For more information or to confirm your requirements are met, please call us at 832-448-5550 or submit the Product Inquiry form.
Product Inquiry
"*" indicates required fields
