ASTM D2000 rubber material callouts
ASTM D2000 is a classification system for vulcanized rubber. Its full title is "Standard Classification System for Rubber Products in Automotive Applications", but drawings in many industries use it.
Instead of naming a brand or a compound, the drawing gives a line callout: a short code for the heat resistance, oil resistance, hardness and tensile strength the rubber must have, plus any extra tests. A compound that meets the callout is generally acceptable, unless your drawing or approved-source list says otherwise.
How to read a callout
M2BG714 B14 EO14 EO34
- M: values are in SI units (MPa). Callouts without the M use the older inch-pound form (psi).
- 2: the grade. Grade 1 is the basic requirements only; grade 2 and higher permit suffix requirements.
- B: the type, set by the heat-aging test temperature (100 °C for type B).
- G: the class, set by the maximum volume swell in IRM 903 oil (40% for class G).
- 7: the hardness, 70 ±5 Shore A.
- 14: the minimum tensile strength, 14 MPa.
- B14: compression set, 22 hours at 100 °C, ASTM D395 Method B.
- EO14: oil resistance, 70 hours at 100 °C in IRM 901 oil.
- EO34: oil resistance, 70 hours at 100 °C in IRM 903 oil.
- In each suffix the letters name the property and the digits pick the test method and temperature from the standard’s tables.
Type: heat resistance
| Type | Test temperature |
|---|---|
| A | 70 °C (158 °F) |
| B | 100 °C (212 °F) |
| C | 125 °C (257 °F) |
| D | 150 °C (302 °F) |
| E | 175 °C (347 °F) |
| F | 200 °C (392 °F) |
| G | 225 °C (437 °F) |
| H | 250 °C (482 °F) |
| J | 275 °C (527 °F) |
| K | 300 °C (572 °F) |
Class: oil resistance
| Class | Maximum volume swell |
|---|---|
| A | No requirement |
| B | 140% |
| C | 120% |
| D | 100% |
| E | 80% |
| F | 60% |
| G | 40% |
| H | 30% |
| J | 20% |
| K | 10% |
Which polymers usually meet which type and class
The callout does not name a polymer, but each type and class is usually met by a few. These are the common pairings for the materials we work with. The final choice depends on the suffix tests and the part.
| Material | Common type and class |
|---|---|
| EPDM | AA, BA, CA, DA |
| Silicone | FC, FE, GE |
| Nitrile (NBR) | BF, BG, BK, CH |
| Viton™ / FKM | HK |
| Neoprene (CR) | BC, BE |
| Fluorosilicone | FK |
| Butyl (IIR) | AA, BA |
| SBR | AA, BA |
| Natural Rubber (NR) | AA |
Common suffix letters
- A: heat resistance
- B: compression set
- C: ozone or weather resistance
- EA: resistance to water and water-based fluids
- EF: fuel resistance
- EO: oil and lubricant resistance
- F: low-temperature resistance
- Z: a special requirement written out on the drawing
Sending us a D2000 callout
Put the full callout on your drawing or in your quote request, including every suffix and any Z note. Send it with a drawing, a sample part or a rough sketch. We will review it and recommend the right material and process with your quote.
Questions we hear
- Is ASTM D2000 a material?
- No. It describes the properties a rubber must have. Several compounds, sometimes from different polymers, can meet the same callout.
- What does the M at the start of a callout mean?
- It means the values are in SI units (MPa). Callouts without the M use the older inch-pound form (psi).
- What should I send with a D2000 callout?
- The full callout with every suffix, plus a drawing, a sample part or a sketch, the quantity, and anything the part touches in service. We will recommend a compound and process with the quote.
Request a quote
Send us a drawing, a sample part or a rough sketch. We will review it, recommend the right material and process, and give you a firm ship date with your quote.
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