Knowledge Base
NH O-RING Academy
Decades of experience in clear, easy-to-understand technical articles: from materials and design to causes of failure. Free, first-hand knowledge about O-rings.
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Technical Articles
Dimensions and Standards
O-ring tables
ISO 3601, AS568, DIN 3771, and others: How to read sizes correctly and find the right standard chart.
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Dimensions and Standards
O-ring ISO 3601
Here you'll find everything you need to know about the ISO 3601 standard: Tolerances…
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Design and Installation
O-Ring Design
Make sure the wire gauge, groove, and material are properly matched.
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Durability and Approvals
O-Ring Compatibility List
Here you'll find everything you need to know about O-ring compatibility charts…
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Materials
Comparison of O-Ring Materials
NBR, EPDM, FKM, FFKM, FEP, and PTFE: An Overview of Temperature, Media, and Approvals.
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Materials
FFKM O-RINGS
Here you'll find everything you need to know about FFKM (ECOLAST®) O-rings. Applications…
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Materials
FKM O-RINGS
Here you'll find everything you need to know about FKM (VITON) O-rings. Applications…
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Materials
NBR O-RINGS
Here you'll find everything you need to know about NBR O-rings: Applications, Resistance…
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Durability and Approvals
Heat-Resistant O-Rings
Temperature ranges from NBR to FFKM, low-temperature limits, steam, and selection based on temperature.
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Dimensions and Standards
O-Ring Designations
Here you'll find everything you need to know about O-ring designations and applications…
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Materials
EPDM O-RINGS
Here you'll find everything you need to know about EPDM O-rings: Applications, Resistance…
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Dimensions and Standards
O-ring DIN 3771
Here you'll find everything you need to know about the DIN 3771 O-ring standard. O-ring…
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Materials
HNBR O-RINGS
Here you'll find everything you need to know about HNBR O-rings: Applications, Resistance…
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Materials
SILICONE O-RINGS
Here you'll find everything you need to know about silicone O-rings: Applications…
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Materials
EPDM (elastomer)
Here you'll find everything you need to know about EPDM: manufacturing, applications, advantages, and…
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Design and Installation
O-ring grooves
Basics of O-Ring Groove Design: Rectangle, Trapezoid, and Triangle.
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Design and Installation
O-Ring Applications
Here you'll find everything you need to know about O-ring applications…
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Materials
FEP O-RINGS
Here you'll find everything you need to know about FEP-coated O-rings. Applications…
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Materials
PTFE O-RINGS
Here you'll find everything you need to know about PTFE (Teflon) O-rings: Applications…
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Materials
FEPM O-RINGS
Here you'll find everything you need to know about FEPM O-rings: Applications, Resistance…
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Materials
FVMQ O-RINGS
Here you'll find everything you need to know about FVMQ O-rings: Applications, Resistance…
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Basics and Purchasing
Buy O-Rings
Here you'll find everything you need to know about buying O-rings. Applications…
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Basics and Purchasing
O-Ring Supplier
Here you'll learn what makes a good O-ring supplier: selection, quality, delivery time…
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Design and Installation
O-Ring Pressure Applications
Here you'll learn how to optimally design O-rings for use under pressure: material selection, Shore hardness…
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Materials
PU (polyurethane)
Here you'll find everything you need to know about PU (polyurethane) manufacturing…
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Design and Installation
O-Ring Installation
Here you'll find everything you need to know about O-ring installation. Installation tools Max.…
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Dimensions and Standards
Measuring O-Rings
Here you'll find everything you need to know about measuring O-rings: material, Shore hardness…
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Design and Installation
10 questions: O-ring grooves
We'll answer your 10 most important questions about O-ring grooves—Questions + Answers…
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Design and Installation
Piston seal
Here you'll find everything you need to know about piston seals: definition, types…
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Design and Installation
O-Ring Coatings
Here you can find out what types of O-ring coatings are available: PTFE coating…
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Design and Installation
O-rings hot water
Here you can find out which O-ring material you should use with hot water or steam…
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Materials
ACM O-RINGS
Here you'll find everything you need to know about ACM O-rings: Applications, Resistance…
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Materials
CR O-RINGS
Here you'll find everything you need to know about CR O-rings: Applications, Resistance…
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Durability and Approvals
FDA Approval
Check out our article on FDA approval, country of origin, guidelines, and testing procedures…
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Basics and Purchasing
O-Ring Guide
Here you'll find everything you need to know about O-rings: Applications, Resistance…
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Materials
Thermoplastic elastomer
Here you'll find everything you need to know about thermoplastic elastomers: Properties…
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Damage and Quality
O-Ring Slot Extrusion
Find out here how you can prevent gap extrusion in O-rings. Causes…
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Materials
elastomer
Here you'll find everything you need to know about elastomers: definition, properties…
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Materials
FEP (fluoroethylene propylene)
Here you'll find everything you need to know about FEP as a material—manufacturing…
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Damage and Quality
Heat Damage to O-Rings
Find out here how to prevent heat damage to O-rings: Causes, signs of damage…
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Basics and Purchasing
O-Ring Bearing
Here you can learn about the best way to store O-rings and their shelf life according to DIN 7715…
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Durability and Approvals
10 questions: O-ring resistance
We'll answer your 10 most important questions about O-ring resistance and more…
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Basics and Purchasing
10 questions: O-ring bearing
We'll answer your 10 most important questions about O-ring storage—Questions + Answers…
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Basics and Purchasing
10 questions: O-ring data sheets
We'll answer your 10 most important questions about O-ring data sheets, FAQs, and more…
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Design and Installation
Elongation at break
Here you'll find all the important information on the topic of elongation at break—definition, measurement…
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Design and Installation
Shore Hardness
Here you'll find everything you need to know about the Shore hardness scale. Definition…
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Design and Installation
O-Ring Shore Hardness
Here you'll find everything you need to know about the Shore hardness of O-rings…
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Basics and Purchasing
O-Ring Manufacturing
Here you can learn about the various methods used to manufacture O-rings: compression molding…
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Basics and Purchasing
General Information About O-Rings
Here you'll find everything you need to know about O-rings: materials, dimensions…
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Materials
CR (Neoprene)
Here you'll find everything you need to know about CR (neoprene)—manufacturing, pros, and…
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Design and Installation
Tensile strength
Discover the basics of tensile strength in our comprehensive article, "Basics..."
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Durability and Approvals
PFAS in the Spotlight
What are PFAS? Where are they found? Where are exposure levels highest? How are PFAS…
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Damage and Quality
O-Ring Wear
Find out here how you can minimize wear on O-rings: Causes, signs of damage…
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Damage and Quality
O-ring deformation
Find out here how you can reduce permanent deformation in O-rings…
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Damage and Quality
O-Ring Swelling
Here you'll learn how to protect your O-rings from the effects of process media. Material selection…
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Damage and Quality
Causes of O-Ring Damage
What are the causes of damage to O-rings, and how can they be prevented? Heat, chemicals…
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Damage and Quality
O-Ring Quality Control
Here you'll learn what optimal quality control for O-rings looks like—dimensions…
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Basics and Purchasing
10 questions: O-ring production
We'll answer your 10 most important questions about O-ring manufacturing +…
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Durability and Approvals
REACH Regulation
Here you'll find everything you need to know about the REACH Regulation. Background, Contents…
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Durability and Approvals
RoHS Directive
Everything You Need to Know About the RoHS Directive: Definition, Contents, Chemicals, Latest…
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Tools & Reference
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Look up terms
O-ring lexicon
Over 100 technical terms related to O-rings, materials, and design, explained in a concise and easy-to-understand way.
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Disclaimer
The content provided by the NH O-RING Academy is intended for general technical information and does not replace application-specific advice. All information is provided for general guidance only; the respective data sheet is authoritative. We make no warranty as to the accuracy or completeness of this information. Liability for damages resulting from the use of this content is excluded to the extent permitted by law.