{"id":3123,"date":"2026-11-10T13:38:00","date_gmt":"2026-11-10T05:38:00","guid":{"rendered":"https:\/\/borrapumps.com\/blog\/pump-mechanical-seal-elastomer-compatibility\/"},"modified":"2026-11-10T13:38:00","modified_gmt":"2026-11-10T05:38:00","slug":"pump-mechanical-seal-elastomer-compatibility","status":"publish","type":"post","link":"https:\/\/borrapumps.com\/ru\/blog\/pump-mechanical-seal-elastomer-compatibility\/","title":{"rendered":"\u0421\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c \u044d\u043b\u0430\u0441\u0442\u043e\u043c\u0435\u0440\u043e\u0432 \u0442\u043e\u0440\u0446\u0435\u0432\u044b\u0445 \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0439 \u043d\u0430\u0441\u043e\u0441\u043e\u0432: \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u0439 \u0441\u043f\u0438\u0441\u043e\u043a \u0434\u043b\u044f \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430"},"content":{"rendered":"

Pump mechanical seal elastomer compatibility must be checked for the exact compound, every fluid it contacts, the temperature range and the installed seal duty. A polymer-family name such as NBR, EPDM or FKM is a starting point, not an approval for a particular chemical service. Prepare a complete exposure list, identify the supplied compound and obtain written confirmation before ordering replacements. This guide explains how buyers and maintenance teams can organize that review without confusing seal-face materials, rubber components and the overall pump specification.<\/p>\n

Identify the component before selecting a material<\/h2>\n

A mechanical seal can contain several secondary sealing elements. Establish which component is being replaced, where it sits and whether the approved parts list gives a specific compound designation. Do not order an unidentified ring from its color, approximate dimensions or a photograph of the assembled pump. Different compounds can look alike, while visually similar seals may have different service requirements.<\/p>\n

Keep the distinction between the rotating and stationary face materials and the secondary seals. A quotation describing a face pair does not necessarily identify the O-ring compound. Ask for the complete material description of the proposed assembly, with enough detail to match each item to the drawing and replacement part number.<\/p>\n

The CYZ-A oil-transfer pump product page<\/a> provides a relevant starting point for a pump inquiry. Its application name does not approve a particular elastomer for every oil, additive or cleaning chemical. Submit the actual liquid and operating conditions with the request. The product images accompanying this guide do not identify hidden seal materials.<\/p>\n

Build an exposure list that includes cleaning and standby<\/h2>\n

Start with the pumped liquid, including its concentration and known additives. Then list the other media that can reach the component: seal-support fluid, approved assembly lubricant, cleaning solution and preservation medium where applicable. Record the sequence of exposure rather than sending a list of chemical names without explaining how the pump is used.<\/p>\n

A seal may operate with one liquid and later encounter a different cleaning mixture. A replacement inquiry that includes only the production fluid leaves that second exposure unanswered. Ask operations to confirm the actual procedure and temperature, including any changes since the previous seal was selected. Do not assume that the last purchase order represents the current duty.<\/p>\n

For mixtures, provide the best available composition and identify uncertainty. A safety data sheet can support the review but may not disclose every ingredient needed for material selection. Where composition is proprietary, arrange an appropriate technical exchange between the fluid supplier and the seal supplier rather than substituting a broad description such as solvent or process oil.<\/p>\n

\"CYZ-A
CYZ-A Self-Priming Oil Transfer Pump. Illustrative setting derived from the original BORRAPUMP product image; not an actual customer installation, internal damage view, bearing arrangement or approved repair procedure.<\/figcaption><\/figure>\n

Read compatibility charts as screening tools<\/h2>\n

The Fluid Sealing Association’s secondary sealing elements resource<\/a> introduces O-ring design parameters, material options and failure modes. This is useful background for understanding which secondary component needs review. Where the supplier also provides a chemical-resistance chart, use it to identify questions for the exact compound; do not turn a general chart entry into a warranty for a complete mechanical seal.<\/p>\n

Record the chart edition, fluid entry, temperature basis and meaning of its rating. A favorable rating under one stated condition does not establish suitability under a different concentration, mixture or exposure sequence. If a rating is missing, that is an unresolved input. It is not evidence that the material is either suitable or unsuitable.<\/p>\n

Parker’s rubber-seal test-report explanation<\/a> describes why test conditions, sample geometry and methods matter when comparing materials. A useful purchasing question is therefore: which exact supplied compound was evaluated, and under which conditions? This avoids a purchase specification that permits any material carrying the same broad family abbreviation.<\/p>\n

Separate chemical resistance from mechanical suitability<\/h2>\n

Chemical compatibility is necessary, but the component also has to perform its intended sealing function. Record the pressure, temperature range, seal arrangement and any movement required at the secondary seal. Ask the seal supplier to review the complete application, including the gland geometry and approved assembly method. A chemically resistant sample alone does not prove correct operation in the equipment.<\/p>\n

Do not replace a compliant component with a different material simply because an online chart gives that material a higher chemical rating. Dimensions, hardness, installation behavior and the supplied seal design may also matter. Treat a material substitution as a technical change requiring documented review, rather than an interchangeable upgrade available through purchasing alone.<\/p>\n

Temperature information needs a clear location and operating context. The bulk process reading may be the only available initial input, but the supplier must decide whether more information about local seal conditions is needed. State what was measured and what remains unknown. Avoid presenting an estimated local temperature as a verified instrument reading.<\/p>\n

Use a review table before requesting a quotation<\/h2>\n

The table below organizes the inquiry. It is a practical information checklist, not a chemical-resistance chart or an approval for a particular polymer.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Review field<\/th>\nWhat the inquiry should contain<\/th>\nQuestion to resolve before purchase<\/th>\n<\/tr>\n<\/thead>\n
Component identity<\/td>\nSeal assembly, drawing location and part number<\/td>\nIs the proposed item the correct secondary seal?<\/td>\n<\/tr>\n
Compound identity<\/td>\nSupplier designation and traceable material description<\/td>\nWas this exact compound reviewed?<\/td>\n<\/tr>\n
Production liquid<\/td>\nComposition, concentration and additives<\/td>\nDoes the review cover the actual mixture?<\/td>\n<\/tr>\n
Other exposures<\/td>\nCleaning, flushing, lubrication and preservation media<\/td>\nAre all contact media included?<\/td>\n<\/tr>\n
Temperature<\/td>\nNormal range, excursions and exposure sequence<\/td>\nWhich condition governs acceptance?<\/td>\n<\/tr>\n
Mechanical duty<\/td>\nPressure, movement and supplied seal arrangement<\/td>\nIs chemical suitability supported by design suitability?<\/td>\n<\/tr>\n
Approval record<\/td>\nReviewer, evidence, limitations and revision<\/td>\nCan purchasing identify the accepted configuration?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Use the referenced secondary-seal and test-report resources for preliminary screening, then attach the supplier’s application decision. If the composition or duty is still uncertain, describe that uncertainty directly in the inquiry and obtain the missing information before release.<\/p>\n

\"IS
IS Clean Water Centrifugal Pump Range, Green Original. Illustrative setting derived from the original BORRAPUMP product image; not an actual customer installation, internal damage view, bearing arrangement or approved repair procedure.<\/figcaption><\/figure>\n

Preserve useful evidence from the removed seal<\/h2>\n

When a failed component is available, preserve its identity and record its condition before disposal. Photograph the part with a scale and label the location from which it was removed. Note whether the observations were made before or after cleaning, because handling and cleaning can change what is visible. Follow the site’s rules for contaminated components and chemical residues.<\/p>\n

Describe observations without turning them into a diagnosis. A ring that looks enlarged, cracked or flattened provides evidence for investigation, but appearance alone does not establish which mechanism caused the damage. Record the service duration, recent operating changes and relevant fluid exposures so the reviewer can evaluate several possibilities.<\/p>\n

Retain an unused, traceable replacement sample if the supplier’s investigation requires one. Do not assume that an unidentified spare from a workshop drawer represents the same compound as the removed component. The comparison becomes more useful when the purchase record, batch information and storage history are available together.<\/p>\n

Decide when testing is needed<\/h2>\n

If published data do not cover the actual fluid, ask the supplier what additional evaluation is appropriate. The test medium, temperature, duration and acceptance criteria should be defined before testing begins. A simple immersion observation may answer one material question but cannot be presented as a complete qualification of the mechanical seal under operating conditions.<\/p>\n

Agree on what a successful test will authorize. It may support a specific compound choice within a stated operating envelope, or it may identify the need for further assessment. Keep the result linked to that scope. Do not generalize a favorable result for one fluid batch to every formulation sold under a similar commercial name.<\/p>\n

The NPTEL rubber-products lecture below offers educational background on rubber materials and applications. It helps explain why a manufactured rubber component is more than a generic family name. It does not certify a compound for a BorraPumps model or replace application-specific compatibility confirmation.<\/p>\n

Keep replacement and conversion decisions separate<\/h2>\n

A like-for-like replacement with confirmed identification is different from changing the seal arrangement or converting a packed pump to a mechanical seal. The Hydraulic Institute’s pump FAQs<\/a> discuss the importance of the seal-chamber environment when considering such changes. A material substitution should not quietly expand into an unreviewed equipment conversion.<\/p>\n

For an overview of the sealing options, use mechanical seal versus gland packing<\/a>. For a broader oil-pump seal inquiry, see oil-transfer pump mechanical seals<\/a>. Those subjects complement this guide; neither supplies the missing compound approval for a specific chemical duty.<\/p>\n

Where leakage prompted the inquiry, also retain the investigation record. A new elastomer will not automatically correct an installation error, an unsuitable operating condition or another damaged component. Review the evidence in self-priming pump mechanical seal failure<\/a> alongside the compatibility work, keeping the conclusions distinct.<\/p>\n

Write an order that preserves the approved choice<\/h2>\n

Once the application is accepted, put the approved compound designation, component identification and permitted alternatives into the purchase specification. Reference the reviewed duty and document revision. If an alternative is offered, require it to be identified explicitly so the technical reviewer can assess it before the order is changed.<\/p>\n

At receipt, match the labels and documentation to the order before mixing the parts with general stock. Record any discrepancy and resolve it with the supplier. Color and physical fit can help detect an obvious mismatch, but they cannot establish chemical identity. Preserve the traceability needed for a future investigation or repeat order.<\/p>\n

Plan a defined follow-up after installation using the site’s approved procedure. Record the actual duty and any changed exposure rather than assuming that the original conditions remain constant. If the process formulation or cleaning program later changes, reopen the compatibility review and update the equipment record. That makes the next replacement a controlled decision rather than another guess.<\/p>\n