- Typical service window
- Approx. −34 to +121 °C
- Typical hardness
- Common quote band: 60–90 Shore A
- Where it performs
- Mineral oils, many fuels, good wear and broad industrial availability.
- Watch-outs
- Usually not the first choice for ozone, weathering, ketones or strong oxidising media.
- Common applications
- Hydraulic and pneumatic equipment, oil-contact seals, general machinery.
O-RING ENGINEERING GUIDE
Material, size and evidence—made easier to compare.
Start with the media, temperature, pressure, motion and groove. Maibos then reviews the compound, dimensions and inspection evidence as one specification.
Engineering guide only · Final suitability is confirmed for the selected compound and application.MATERIAL SELECTOR
Four established elastomer families.
Filter by the dominant operating condition. The table is a screening tool, not a substitute for application testing.
- Typical service window
- Approx. −26 to +205 °C
- Typical hardness
- Common quote band: 70–90 Shore A
- Where it performs
- Heat, oils, fuels and many chemical environments.
- Watch-outs
- Hot water, steam, ketones and low-temperature duty require grade-specific review.
- Common applications
- Automotive, process equipment, high-temperature oil and fuel systems.
- Typical service window
- Typical project window: −60 to +200 °C
- Typical hardness
- Common quote band: 40–80 Shore A
- Where it performs
- Wide temperature flexibility, ozone and weather resistance; colour options.
- Watch-outs
- Abrasion, tear strength and gas permeability can limit dynamic or high-pressure use.
- Common applications
- Thermal cycling, electrical equipment and selected clean or special-purpose assemblies.
- Typical service window
- Approx. −57 to +121 °C
- Typical hardness
- Common quote band: 50–90 Shore A
- Where it performs
- Water, steam, ozone, weathering and many polar fluids.
- Watch-outs
- Generally unsuitable for petroleum oils, hydrocarbon fuels and many non-polar solvents.
- Common applications
- Water systems, outdoor equipment, braking fluids and selected chemical service.
SIZE REFERENCE
Turn a size name into a usable conversation.
Search the common metric cross-sections or review the five nominal AS568 cross-section families. Full copyrighted standard tables are not reproduced; final size and tolerance are confirmed from the governing standard and drawing.
| Family / section | Nominal cross-section | How to use it |
|---|---|---|
| 1.00 mm | Metric | d1 + 2 × d2 = OD |
| 1.50 mm | Metric | d1 + 2 × d2 = OD |
| 1.78 mm | Metric / AS568-000 | d1 + 2 × d2 = OD |
| 2.00 mm | Metric | d1 + 2 × d2 = OD |
| 2.50 mm | Metric | d1 + 2 × d2 = OD |
| 2.62 mm | Metric / AS568-100 | d1 + 2 × d2 = OD |
| 3.00 mm | Metric | d1 + 2 × d2 = OD |
| 3.53 mm | Metric / AS568-200 | d1 + 2 × d2 = OD |
| 4.00 mm | Metric | d1 + 2 × d2 = OD |
| 5.00 mm | Metric | d1 + 2 × d2 = OD |
| 5.33 mm | Metric / AS568-300 | d1 + 2 × d2 = OD |
| 5.70 mm | Metric | d1 + 2 × d2 = OD |
| 6.99 mm | Metric / AS568-400 | d1 + 2 × d2 = OD |
| 7.00 mm | Metric | d1 + 2 × d2 = OD |
| 8.00 mm | Metric | d1 + 2 × d2 = OD |
STANDARDS & COMPLIANCE
Click through the evidence chain.
Standards define dimensions, test methods or acceptance rules. They do not by themselves prove that every Maibos part is certified. We confirm the applicable revision, compound and required evidence before order.
| Reference | What it controls | How Maibos uses it | Evidence to confirm |
|---|---|---|---|
| ISO 3601-1:2012O-ring dimensions and codes | Inside diameter, cross-section, tolerances and designation. | Used when the drawing or purchase specification names ISO sizes. | Approved drawing and dimensional inspection record. |
| ISO 3601-2:2025Housing dimensions | General industrial gland geometry for hydraulic and pneumatic applications. | A design reference; final groove geometry remains an application decision. | Customer drawing, DFM review and agreed inspection points. |
| ISO 3601-3:2005Quality acceptance | Classification and limits for surface imperfections. | Acceptance grade must be stated before quotation and production. | Inspection plan, sampling rule and outgoing record. |
| ISO 3601-5:2015Industrial elastomer materials | Selected material specifications and agreed physical properties. | Compound requirements are agreed between user and supplier. | Compound sheet and specified test results. |
| SAE AS568FAerospace size reference | Inch-series IDs, cross-sections, tolerances and dash numbers. | Used as a dimensional reference when an AS568 size is requested. | Dash number confirmation and dimensional inspection. |
| ASTM D1414 / D2240 / D2000Rubber testing and classification | O-ring tests, durometer hardness and rubber material classification. | Only the methods called out in the order are applied. | Named test report or certificate from the agreed source. |
| REACH / RoHSEU chemical restrictions | REACH concerns chemical risks; RoHS applies to covered electrical/electronic equipment. | Documentation is checked for the selected compound and destination, not assumed for every product. | Current supplier declaration and, where required, test evidence. |
RFQ CHECKLIST
Seven inputs produce a better seal review.
Even partial information is useful. Unknown values can be resolved during technical review.
- 01Medium and concentration
- 02Minimum / maximum temperature
- 03Pressure and pressure cycling
- 04Static, rotary or reciprocating motion
- 05Groove dimensions or equipment drawing
- 06Target hardness and colour
- 07Required standard, inspection and compliance evidence
ENGINEERING INQUIRY
Send the conditions—not just an O-ring colour.
Share a drawing, sample or the operating data above. We will structure the next conversation around a material, size and verification plan.