Can ChatGPT check if a seal material is chemically compatible?
Summary
Only if used as a first screen: ChatGPT recalls general seal compatibility ratings but cannot confirm a seal at your temperature, concentration and exposure time. It holds for an elastomer family and a pure chemical near room temperature in static service. For a named compound, a mixture or real service conditions, confirm with the maker's chart and an immersion test.
Bal Seal's chemical compatibility guide rates static effects at an ambient 23 °C (73 °F), with some high-performance polymers also rated at 100 °C (212 °F) (Bal Seal Engineering, 2023).
Chart ratings are usually based on volume swell: below about 10 or 15% is typically rated excellent, and 10 to 25% may suit a static application (Marco Rubber, 2021).
Parker gives up to 30% volume swell as usually tolerable for static O-rings and 10 or 15% as a reasonable maximum for dynamic ones, as a rule of thumb (Parker Hannifin, 2021).
ISO 1817:2026, edition 9 published in August 2026, evaluates rubbers by measuring properties before and after immersion in test liquids (ISO, 2026).
When can you rely on ChatGPT for a seal chemical compatibility check, and when not?
You can rely on ChatGPT for a seal chemical compatibility check only to shortlist elastomer families against one pure chemical near room temperature. Any decision about a named compound, a mixture or real service conditions needs a cited chart or a test. Published charts rate a material against a single chemical in isolated tests at room temperature and pressure (Marco Rubber, 2021), and a chatbot answer is no better than the chart behind it. In practice, the chatbot can tell you which elastomer families to ask a seal maker about, not which seal to install. The table below decides when a ChatGPT compatibility answer works as a screen and what to check instead.
Seal compatibility situation | ChatGPT verdict | Why | What to check instead |
|---|---|---|---|
Elastomer family (FKM, EPDM, NBR) against one pure chemical, static seal near 23 °C | Usable as a first screen | Bal Seal's chart rates static effects at an ambient 23 °C (Bal Seal Engineering, 2023) | The maker's chart for the same pair |
Named compound or part number | No | Specific compound formulations can alter generalized ratings (Marco Rubber, 2021) | The maker's table for that compound |
Service temperature above the chart's test temperature | No | Acid resistance often changes dramatically with temperature (Parker Hannifin, 2021) | Maker data at temperature, or an immersion test at service temperature |
Diluted, concentrated or mixed fluid | No | Resistance changes with concentration, and multiple chemicals change performance (Parker Hannifin, 2021; Marco Rubber, 2021) | An immersion test in the actual fluid |
Dynamic seal | Only with a test | 10 or 15% swell is a reasonable maximum for dynamic seals, as a rule of thumb (Parker Hannifin, 2021) | Maker rating for dynamic service, then a functional test |
Rating of "2", "fair" or "good" | Static only, after a test | A "2" rating is usually acceptable for static seals but should be tested in all cases (Parker Hannifin, 2021) | A test under service conditions |
Answer that names no chart or edition | Treat as unverified | Generative AI can confidently present false content (NIST AI 600-1, 2024) | Ask for the chart and check it yourself |
The row that decides most cases is the third: a rating made at an ambient 23 °C (Bal Seal Engineering, 2023) says little about a seal running hot in the same chemical. Keep the chart you checked with the selection record.
Where does ChatGPT get seal compatibility ratings, and what do they leave out?
ChatGPT gets seal compatibility ratings from patterns in its training text, which most likely includes the charts seal makers publish, unless it searches the web or reads a file you attach. Language models learn by predicting the next word in large amounts of text, with no true or false labels on each statement (OpenAI, 2025), so a recalled rating is a likely answer, not a looked-up one.
The charts rest on immersion tests. ASTM D471-16a(2021) measures change in mass, volume, tensile strength, elongation and hardness after immersion, and states that it "may not give any direct correlation with actual part performance, since service conditions vary too widely" (ASTM International, 2021). ISO 1817:2026 likewise measures rubber properties before and after immersion in test liquids (ISO, 2026).
What a seal compatibility rating leaves out is everything outside that test: service temperature, pressure, gland design, motion, concentration, other chemicals in the stream and exposure longer than the test. Rating scales also differ by maker. Parker rates 1 to 4, with x for insufficient data (Parker Hannifin, 2021), while others use letters or colors, so a recalled rating can mix scales.
What goes wrong when ChatGPT copies a general chemical compatibility chart?
When ChatGPT copies a general chemical compatibility chart, a rating made for one polymer family, one pure chemical and room temperature gets applied to another compound, fluid or temperature without saying so. Four failures follow.
The compound changes: a chart row for FKM covers a family, and specific compound formulations can alter the generalized rating (Marco Rubber, 2021). The temperature and strength change: resistance of elastomers to acids "often changes dramatically with temperature and with concentration" (Parker Hannifin, 2021). The time changes: the usual 70-hour ASTM immersion test can show swelling where a long-term test shows shrinkage, so short-term swell may be only an interim condition (Parker Hannifin, 2021). The certainty is false: NIST describes confabulation as generative AI that confidently presents erroneous or false content (NIST AI 600-1, 2024), so a wrong seal rating reads exactly like a right one.
A seal can also fail for reasons no chart covers. Excessive swell softens the rubber and may permit extrusion under high pressure (Parker Hannifin, 2021), which is a gland and pressure question, separate from whether the chatbot recalled the chart correctly.
Which sources should confirm a ChatGPT seal compatibility answer?
Three sources should confirm a ChatGPT seal compatibility answer: the seal maker's chart for the named compound, the maker's application engineer for your conditions, and an immersion or functional test in the actual fluid. Parker says the compound recommended in its tables should normally be the one specified for initial testing and evaluation, and that a selection is proven by functional testing (Parker Hannifin, 2021). Bal Seal recommends that buyers run evaluation testing under actual service conditions (Bal Seal Engineering, 2023).
For the test, ASTM D471-16a(2021) and ISO 1817:2026 give the immersion methods; run them at service temperature in the plant fluid, handling the fluid under its SDS sections 7 and 8 and your site's hazardous chemical procedure. If the charts and data sheets are your own company files, whether ChatGPT can answer from company technical documents depends on how those files reach the chat. Lubinpla's main agent answers from the TDSs and records stored in your Dataroom, cites them as sources and keeps unsourced values separate from sourced ones. Record which chart, edition and test result each seal choice rests on.
Frequently asked questions
How do you ask an AI for a seal compatibility check so it shows its sources?
Give the full condition set: seal compound or part number, fluid with concentration, service temperature range, pressure, static or dynamic service and expected exposure time. Ask it to name the chart and edition behind each rating and to mark any rating it cannot source. Attach the maker's chart if you have it, then check each cited rating against that document.
Is an "acceptable" chart rating enough for a dynamic seal?
Not on its own. Bal Seal notes that pressure, temperature, speed, lubricating properties and surface tension affect results in dynamic situations even for materials rated acceptable (Bal Seal Engineering, 2023). Confirm a dynamic seal with the maker and a functional test.
Does a seal compatibility rating tell you how long the seal will last?
No. A chart rating summarizes a short immersion test, and the usual 70-hour ASTM test can show swelling where long-term immersion shows shrinkage (Parker Hannifin, 2021). Service life also depends on temperature, motion and gland design, which a chart does not cover.