Rubber cable grommets for sealed enclosures
Exonel moulds cable grommets and strain-relief seals designed for IP67/IP68 sealing applications. They seal around running cables to keep dust and water out of electrical, solar and EV housings, in compounds formulated for UV, ozone and temperature swings.
Figures are indicative and are confirmed for your application before tooling.
Built to keep ingress out.
Radial sealing
The grommet grips the cable and the panel cut-out so there is no open path for dust or water.
Strain relief
Profiles that hold the cable and take the pull, so the seal is not disturbed.
Weather resistance
Compounds formulated against UV, ozone cracking and repeated heating and cooling.
EPDM or silicone.
EPDM
Good insulation and long outdoor life. The usual choice for junction boxes and panels.
Flame-retardant silicone
High dielectric strength and flame-retardant compounding for enclosures where that is specified.
Typical applications.
Electrical and switchgear
Cable entry seals for distribution and control panels.
Automotive and EV
Harness grommets and strain reliefs.
Renewable and solar
Junction-box and inverter cable seals for outdoor duty.
Six base polymers, compared.
Temperature range, hardness and resistance for typical commercial compounds of each polymer. Ratings run from A (excellent) to X (not suitable).
| Material | Temp range (°C) | Hardness (Shore A) | Oil | Fuel | Acid | Base | Water / steam | Ozone / weather |
|---|---|---|---|---|---|---|---|---|
| Silicone (VMQ) | −60 to +225 | 20 to 90 | C | D | C | C | B | A |
| EPDM | −45 to +150 | 30 to 90 | X | X | A | A | A | A |
| FKM (Viton-type) | −20 to +200 | 50 to 95 | A | A | A | C | C | A |
| NBR | −40 to +120 | 20 to 100 | A | B | C | B | B | D |
| Neoprene (CR) | −40 to +120 | 15 to 95 | B | C | C | B | B | B |
| SBR | −50 to +100 | 30 to 100 | X | X | C | B | B | D |
Key: A Excellent · B Good · C Fair · D Poor · X Not suitable
Figures are the typical range across commercial compounds. Special grades extend several of these limits: silicone to −117°C and +260°C, FKM to −40°C, NBR to −57°C. Figures are indicative and are confirmed for your application before tooling.
Sources: o-ring.info, Basic properties of elastomers; Mykin Inc, Rubber properties; Delta Rubber, Rubber material comparison guide; GMORS, VMQ silicone (silicone temperature range).
Common questions
Are your grommets IP67 or IP68 rated?
Which material is best for outdoor cable seals?
Can you make a grommet to a drawing?
Need cable grommets for a sealed enclosure?
Send your RFQ
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Exonel Industries makes custom moulded and extruded rubber components in Howrah, Kolkata, West Bengal, and supplies manufacturers across India. We work in six base polymers, Silicone, EPDM, FKM, NBR, Neoprene and SBR, formulated into hundreds of compounds. Compounding, tooling and production are done in-house. Send a drawing, a sample or a specification for a quote.
