What to include in your compound request.
Print this list or save it as a PDF. Answer each line and you will get quotations you can compare.
- What the part is and how it seals (static or dynamic, gas or liquid)
- Fluids with concentrations: oil, fuel, amines, H2S, CO2, steam, brine, additives
- Lowest and highest service temperature, and the time held at the highest
- Maximum pressure, and whether it drops quickly (gas decompression)
- Hardness with tolerance and method (ASTM D2240 or ISO 48-4)
- Tensile strength and elongation at break (ASTM D412)
- Compression set with temperature and time (ASTM D395 Method B or ISO 815-1)
- Fluid immersion: fluid, temperature, time and allowed volume and hardness change (ASTM D471)
- Low-temperature requirement, such as TR10 (ASTM D1329) or low-temperature compression set
- Gas decompression standard and acceptance criteria, if relevant (ISO 23936-2 or NORSOK M-710)
- Form (sheet, strip, pellets), quantity per order and per year, delivery date
- Certificate of analysis per lot, and traceability to raw-material lots if you audit that far
- Any third-party approval you require, with the certificate asked for
- How you will accept the first lots (your tests, ours, or both)
Prepared by Pascalor. Write limits, not adjectives. See the buyer note How to write a compound specification.