Silicone Oil for Automotive: Uses, Grades and Bulk Supply in India

Where silicone oil is used in the automotive industry

PDMS is a dimethyl silicone fluid — clear, inert, non-corrosive, thermally stable and chemically unreactive. That combination of a low, stable viscosity change with temperature, water repellency and dielectric strength makes it useful right across automotive manufacturing and aftercare. The main uses fall into a few groups:

• Lubrication and damping fluids — PDMS is used as a damping medium in dashpots, dampers and controlled-movement mechanisms, and to quiet noise, vibration and harshness (NVH) in moving assemblies. Its viscosity stays predictable across the temperature swings a vehicle sees.
• Assembly and component lubrication — a thin silicone film lets rubber and plastic parts — grommets, weather seals, hoses, connectors, gaskets — slide together during assembly without sticking, squeaking or nipping, without attacking the elastomer the way some mineral oils do.
• Mould release — for rubber, tyre and plastic auto parts, PDMS is a clean release agent that lets moulded components come out crisply and repeatably without contaminating the part.
• Base fluid for car-care and polish products — the shine, slip and water-beading in polishes, tyre dressings, dashboard products and spray detailers come from silicone. PDMS is the base fluid those finished products are built on.
• Plastic and rubber processing aids — as an internal or external lubricant and flow aid, PDMS improves surface finish and eases processing of the polymers that make up bumpers, trim, seals and interior parts.
• Heat-transfer and dielectric uses — its thermal stability and electrical-insulating character make PDMS a candidate fluid for heat-transfer and dielectric duties in certain equipment.

Base fluid vs. finished product — where Ecovalley fits

This is the distinction that matters when you're sourcing. Some of the uses above are the silicone oil itself — mould release, assembly lubrication, a damping fill. Others — a branded tyre shine, a dashboard polish, a spray detailer — are finished products formulated on top of a PDMS base fluid, usually as emulsions with other additives.

Ecovalley makes the base. We manufacture industrial-grade PDMS silicone oil and DMC — the base fluids that lubricant blenders, mould-release compounders and car-care formulators build on — rather than finished, branded automotive products. We don't make brake fluid, greases or bottled car polish; we make the dimethyl silicone fluid that goes into them. If you formulate automotive products or use silicone oil directly on your line, that's exactly what we supply.

Which viscosity grade for which automotive job?

Silicone oil is specified by viscosity, in centistokes (cSt), and the right grade depends on the application:

• Lower viscosity (roughly 90–350 cSt) — spreads thin and penetrates; suits mould release, assembly lubrication, and car-care emulsions where you want an even, light film and easy emulsification.
• Higher viscosity (500–1000 cSt and up) — more surface lubrication, more cling and more damping resistance; suits damping fluids, heavier lubrication, and finishes that need to survive handling and washing.

Ecovalley's S201 PDMS range runs from S201-100 to S201-1000 — approximately 90 to 1100 cSt — so the grade can be matched to the duty rather than the other way round. Tell us the application — release, damping, lubrication or a car-care formulation — and the film or feel you're targeting, and we'll recommend a viscosity.

The recycled-PDMS advantage for automotive supply chains

Automotive is one of the most ESG-scrutinised supply chains in the world. OEMs push carbon-reduction targets down through their Tier-1 and Tier-2 suppliers, and Scope-3 emissions — the materials you buy in — are increasingly on the audit sheet. That's where a recovered-silicone input earns its place.

Ecovalley's PDMS is recovered from industrial silicone, but recovered PDMS is chemically the same dimethyl silicone as virgin material: same backbone, same performance, made to industrial specification and certified to ISO 9001:2015, REACH and RoHS. The difference is the carbon footprint. For a component maker or formulator supplying the auto sector, switching to a recovered-silicone base is a real, documentable circular-economy story you can put in front of your OEM customers — the same performance at a lower environmental cost.

Sourcing silicone oil for automotive in bulk in India

Ecovalley manufactures PDMS silicone oil at its plant in Sonipat, Haryana (established 2016) and supplies industrial buyers across India in 50 kg and 200 kg barrels. For an automotive supplier, the things that matter are consistent viscosity batch to batch, reliable pan-India supply, and a technical data sheet you can hand to your own quality team and customers — all standard.

Tell us your application, target viscosity and monthly volume and we'll respond with specifications and lead time.

Frequently asked questions