Material Compatibility
Rubber Material Compatibility: What to Specify
Prepare a compatibility review using the exact fluid, concentration, temperature and exposure cycle. Generic family comparisons help narrow a discussion but do not replace compound testing.
01 / Material Compatibility
Identify the fluid and the compound
A compatibility review starts with the actual chemical product and candidate grade. Include mixtures, concentration, additives, contamination and cleaning. A polymer family, solvent polarity label or trade name can help identify a starting point; the comparison needs the complete exposure and compound records.
02 / Material Compatibility
Build an exposure brief
List each medium and each stage of service so the test request represents the component’s duty.
| Input | Information to provide |
|---|---|
| Medium | Product name, composition or available specification, concentration and additives |
| Sequence | Contact side, continuous or intermittent exposure, rinses, cleaning and alternating media |
| Temperature and time | Normal and peak conditions, duration, cycles and recovery |
| Pressure | Liquid or gas duty, pressure history and decompression where relevant |
| Material and specimen | Exact compound, sample lot, geometry, processing and initial condition |
| Changes to measure | Agreed mass, volume, hardness, strength, recovery or fluid measurements |
| Assembly acceptance | Dimensions, leakage or required function, conditions and decision criteria |
03 / Material Compatibility
Compare candidates on a common basis
For EPDM/FKM, HNBR/FKM, NBR/FKM or AEM/ACM comparisons, identify the grades and compare reports with matched fluids, conditions and methods. Keep initial and exposed results together. A liquid-immersion result informs a material comparison; the installed seal still needs its own functional evaluation.
04 / Material Compatibility
Include the complete cleaning and pressure history
A cleaning cycle can involve several chemicals, rinses and temperature stages. Describe each stage and any steam by its actual temperature, pressure and duration. For gas service, include composition, pressure changes and the required decompression evaluation. Where H2S is involved, keep the customer’s metal-standard requirement separate from the elastomer test protocol.
05 / Material Compatibility
Define what a replacement must preserve
For a reference part in polyurethane or PTFE, identify its grade, drawing and reason for the proposed change before comparing a rubber candidate. Agree the properties, dimensions, process and function that require evaluation. Send the available specification and mark unknown inputs for review; sample approval and supply scope can then be defined for the project. For a humid or hot-water environment, include humidity or liquid-contact state, temperature and duration with the exact polymer grade. For a fuel, send the full fuel specification and blend information.
From your requirements to a component review
Discuss the Specification
Send your drawing or describe the application. Include service conditions, material requirements and quantity.