Knowledge base
NH O-RING Academy
Decades of experience in clear, easy-to-understand technical articles: from materials through design to causes of damage. Free O-ring knowledge, first-hand.
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In our Academy, Norbert gives you helpful tips and pointers.
Technical articles
Dimensions and standards
O-ring tables
ISO 3601, AS568, DIN 3771 and more: read sizes correctly and find the right standard table.
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Dimensions and standards
O-ring ISO 3601
The five parts of the standard: dimensions, tolerance classes A and B, housings, quality, back-up rings and materials.
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Design and installation
O-ring design
Matching cord thickness, groove and material correctly.
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Resistance and approvals
O-ring resistance list
Read ratings A to D correctly, understand media attack and know the limits of a list.
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Materials
O-ring materials compared
NBR, EPDM, FKM, FFKM, FEP and PTFE: temperature, media and approvals at a glance.
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Materials
FFKM O-rings
What makes FFKM so resistant, FFKM vs. FKM and which ECOLAST compound suits your application.
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Materials
FKM O-rings
Where FKM excels, where its limits lie and which FKM compound suits your application.
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Materials
NBR O-RINGS
Here you will learn everything you should know about NBR O-rings: applications, resistance…
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Resistance and approvals
Heat-resistant O-rings
Temperature ranges from NBR to FFKM, low-temperature limits, steam and choosing by temperature.
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Dimensions and standards
O-ring designations
Here you will learn everything you should know about O-ring designations: applications…
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Materials
EPDM O-RINGS
Here you will learn everything you should know about EPDM O-rings: applications, resistance…
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Dimensions and standards
O-ring DIN 3771
Here you will learn everything you need to know about the O-ring standard DIN 3771…
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Materials
HNBR O-RINGS
Here you will learn everything you should know about HNBR O-rings: applications, resistance…
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Materials
SILICONE O-rings
Here you will learn everything you should know about silicone O-rings: applications…
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Materials
EPDM (elastomer)
Here you will learn 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: rectangular, trapezoidal and triangular grooves.
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Design and installation
O-ring applications
Here you will learn everything you need to know about O-ring applications…
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Materials
FEP O-RINGS
Here you will learn everything you should know about FEP-encapsulated O-rings: applications…
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Materials
PTFE O-RINGS
Here you will learn everything you should know about PTFE O-rings: applications…
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Materials
FEPM O-RINGS
Here you will learn everything you should know about FEPM O-rings: applications, resistance…
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Materials
FVMQ O-RINGS
Here you will learn everything you should know about FVMQ O-rings: applications, resistance…
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Basics and purchasing
Buying O-rings
Here you will learn everything you should know about buying O-rings: applications…
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Basics and purchasing
O-ring supplier
Here you will learn what makes a good O-ring supplier: selection, quality, delivery time…
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Design and installation
O-ring pressure application
Here you will learn how to design O-rings for pressure: material selection, Shore hardness…
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Materials
PU (polyurethane)
Here you will learn everything you need to know about PU (polyurethane): manufacturing…
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Design and installation
O-ring installation
Here you will learn everything you need to know about O-ring installation: installation aids, max.…
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Dimensions and standards
Measuring O-rings
Here you will 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 answer the 10 most important questions about O-ring grooves: questions and answers…
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Design and installation
Piston seal
Here you will learn everything you need to know about the piston seal: definition, types…
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Design and installation
O-ring coatings
Here you will learn which types of O-ring coatings exist: PTFE coating…
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Design and installation
O-rings for hot water
Here you will learn which O-ring material to use for hot water or steam…
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Materials
ACM O-RINGS
Here you will learn everything you should know about ACM O-rings: applications, resistance…
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Materials
CR O-RINGS
Here you will learn everything you should know about CR O-rings: applications, resistance…
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Resistance and approvals
FDA approval
Discover our article on FDA approval: origin, guidelines, test procedures…
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Basics and purchasing
O-ring guide
Here you will learn everything you should know about O-rings: applications, resistance…
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Materials
Thermoplastic elastomer
Here you will find everything you need to know about thermoplastic elastomers: properties…
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Damage and quality
O-ring gap extrusion
Learn how to avoid gap extrusion in O-rings: causes…
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Materials
Elastomer
Here you will find everything you should know about elastomers: definition, properties…
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Materials
FEP (fluorinated ethylene propylene)
Here you will learn everything you need to know about FEP as a material: manufacturing…
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Damage and quality
O-ring heat damage
Learn how to avoid heat damage to O-rings: causes, damage pattern…
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Basics and purchasing
O-ring storage
Here you will learn what optimal storage for O-rings looks like: shelf life, DIN 7716…
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Resistance and approvals
10 questions: O-ring resistance
We answer the 10 most important questions about O-ring resistance: questions and answers…
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Basics and purchasing
10 questions: O-ring storage
We answer the 10 most important questions about O-ring storage: questions and answers…
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Basics and purchasing
10 questions: O-ring data sheets
We answer the 10 most important questions about O-ring data sheets: questions and answers…
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Design and installation
Elongation at break
Here you will find all the important information on elongation at break: definition, measurement…
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Design and installation
Shore hardness
Here you will find everything you need to know about Shore hardness: definition…
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Design and installation
O-ring Shore hardness
Here you will learn everything you should know about the Shore hardness of O-rings…
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Basics and purchasing
O-ring manufacturing
Here you will learn which processes are used to manufacture O-rings: compression moulding…
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Basics and purchasing
O-ring general knowledge
Here you will learn everything you should know about O-rings: materials, dimensions…
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Materials
CR (neoprene)
Here you will learn everything you need to know about CR (neoprene): manufacturing, advantages and…
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Design and installation
Tensile strength
Discover the basics of tensile strength in our comprehensive article…
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Resistance and approvals
PFAS in focus
What are PFAS? Where are they found? Where is exposure highest? How are PFAS…
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Damage and quality
O-ring abrasion
Learn how to minimise abrasion on O-rings: causes, damage pattern…
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Damage and quality
O-ring deformation
Learn how to reduce permanent deformation of O-rings…
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Damage and quality
O-ring swelling
Here you will learn how to protect your O-rings from media: material selection…
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Damage and quality
O-ring causes of damage
Which causes of damage occur in O-rings and how can they be avoided: heat, chemicals…
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Damage and quality
O-ring quality control
Here you will learn what optimal quality control of O-rings looks like: dimensions…
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Basics and purchasing
10 questions: O-ring manufacturing
We answer the 10 most important questions about O-ring manufacturing: questions and answers…
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Resistance and approvals
REACH Regulation
Here you will find everything you need to know about the REACH Regulation: background, contents…
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Resistance and approvals
RoHS Directive
Everything you need to know about the RoHS Directive: definition, contents, chemicals, latest…
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Tools & Reference
Free O-ring tools
Look up terms
O-ring glossary
Over 100 technical terms about O-rings, materials and design, compactly and clearly explained.
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Disclaimer
The content of the NH O-RING Academy serves as general technical information and does not replace application-specific advice. All information provided is for guidance only; the respective data sheet is authoritative. We accept no guarantee for accuracy and completeness. Liability for damages arising from the use of the content is excluded to the extent permitted by law.