Technical Specifications
| Property | Unit | Typical Value | Test Method |
|---|---|---|---|
| Appearance | Colorless clear liquid | Visual | |
| Density at 25 °C | kg/m³ | 790 | ASTM D4052 |
| Flash Point | °C | 80 | ASTM D93 |
| Recommended addition | ppm | 30–200 | — |
* Typical values from batch production. Batch-specific COA available on request.
Technical content reviewed by the CheMost additives team · Specifications last reviewed
Molecular Structure
Composition · acrylate compound defoamer
Acrylate (polyacrylate) defoamer compound with a trace of polydimethylsiloxane (PDMS)
A formulated compound: an oil-soluble polyacrylate defoamer carrying a trace of silicone — gentler on surface tension than neat silicone, so it controls foam with less impact on air release.
What Is an Acrylate-Based Compound Lubricant Defoamer?
CheMost compound lubricant defoamers (grades T9100 and T9200) are acrylate-based foam inhibitors for lubricating oils. They control foam while having a low impact on air-release values — and, unlike a neat silicone fluid, they need no dilution: just add. Both grades also contain a trace of polydimethylsiloxane (PDMS) from the manufacturing process.
The reason to choose an acrylate (polyacrylate) defoamer over a straight silicone is the balance between two different jobs. Foam is air trapped at the oil surface; air release (deaeration) is the escape of air entrained inside the oil. Silicone is the most efficient surface-foam breaker, but it lowers the fluid’s surface tension strongly and can slow air release. A polyacrylate defoamer has a much gentler effect on surface tension, so it controls foam with less penalty to air release — at the cost of being somewhat less aggressive at raw foam knockdown.
Both grades are a colorless, clear liquid dosed at parts-per-million levels. T9100 is the general-purpose grade with low impact on air-release values; T9200 is tuned for oils that contain sulfonate additives, giving enhanced foam suppression in those systems.
How the Compound Defoamer Works
Enters the foam film
The oil-soluble polyacrylate, with the trace of silicone, migrates to the foam-bubble film, destabilises it and lets the bubble rupture.
Gentle on surface tension
Polyacrylate has a much smaller effect on the oil’s surface tension than neat silicone, so it controls foam with less impact on air release — important in hydraulic and circulating systems.
No dilution needed
The compound is supplied ready to use and is metered straight into the oil at ppm levels — no pre-dilution step, unlike a neat silicone fluid.
Tuned for the system (T9200)
Surface-active sulfonate detergents stabilise foam; T9200 is formulated to give enhanced foam suppression in oils that contain sulfonate additives.
Acrylate Compound vs Silicone Defoamers — Where T9100 / T9200 Fit
CheMost offers both defoamer routes. The table places the acrylate compound defoamer against the silicone fluid so you can pick by the balance you need — air release and easy handling versus raw surface-foam knockdown. All figures are from each grade’s data sheet.
| Grade | Chemistry | Dose | Best for |
|---|---|---|---|
| T9100 / T9200 (this page) | Acrylate + trace silicone | 30–200 ppm (no dilution) | Foam control with low impact on air release; sulfonate-containing oils (T9200) |
| Silicone defoamer (G1000) | Polydimethylsiloxane (silicone) | 10–500 ppm (pre-dilute) | Maximum surface-foam knockdown |
| Silicone-free defoamer (T9000) | Non-silicone organic polymers | 20–200 ppm (no dilution) | Systems where any silicone is unacceptable; air release unaffected |
Choosing between T9100 and T9200. Both are the same acrylate compound chemistry at the same specification. Use T9100 as the general-purpose defoamer where low impact on air release is the priority. Use T9200 when the oil contains sulfonate detergents — these are surface-active and stabilise foam, and T9200 is formulated to give enhanced foam suppression in exactly those systems. Against the silicone G1000, pick the compound defoamer when air release and a no-dilution add matter more than raw knockdown.
Applications
CheMost compound defoamers are used as the foam-control component in formulations targeting the duties below:
Engine oils
Foam control in engine oils, where sulfonate detergents are common — T9200 is matched to those sulfonate-containing systems.
Hydraulic & circulating oils
Air-release-sensitive hydraulic and circulating oils, where the low impact on deaeration is the key advantage over a neat silicone.
Industrial & gear oils
Industrial and gear oils that need foam control without compromising air release.
Turbine oils
Turbine and other circulating oils where both surface foam and entrained air have to be managed.
Finished-oil performance approvals belong to the fully formulated oil, not to an individual additive component.
Treat Rate
The data sheet gives an application window rather than a fixed dose, so the guidance below is indicative — confirm the final level against a foam bench test (ASTM D892).
First-order estimate. The application range is 30–200 ppm, added without dilution. Polyacrylate defoamers are high-impact, low-treat components (industry literature cites roughly 0.005–0.1 wt%); dose to the lowest level that meets the ASTM D892 foam result, since over-dosing any antifoam can ultimately make foam worse.
The exact level depends on the base oil and the surface-active additives in the package — sulfonate detergents in particular stabilise foam and call for the sulfonate-tuned T9200. Because no dilution is required, the compound is simply metered into the blend.
Treat rates are indicative, not fixed dosages. CheMost can provide formulation and treat-rate support on request.
Formulating With a Compound Defoamer — Complementary Additives
Silicone defoamer (G1000)
Where raw surface-foam knockdown is the priority and air release is less critical, the neat silicone fluid is the alternative route — more aggressive, but it must be pre-diluted.
Detergents
Sulfonate detergents are surface-active and stabilise foam; T9200 is the grade matched to detergent-heavy oils, controlling the foam those additives would otherwise hold.
Hydraulic & industrial DI packages
The compound defoamer is the foam-control component alongside the antiwear, rust and oxidation additives — chosen here for its low impact on air release.
Base oil & air release
In air-release-sensitive systems the acrylate route is preferred precisely because it is gentle on surface tension; the base oil and package set the final balance.
Documentation, Qualification & Regulatory Support
Standard documentation — Certificate of Analysis (COA, per shipment), Technical Data Sheet (TDS) and Safety Data Sheet (SDS, GHS/CLP) — is provided. The full TDS is available on request rather than as a public download. Additional support is available on request:
Regulatory documentation
REACH, TSCA and country-specific market-registration documentation support available on request.
Third-party inspection
SGS / Intertek / BV pre-shipment inspection can be arranged on request.
Custom grades & packaging
Custom grades and packaging on request.
Formulation support
Defoamer-selection and treat-rate guidance from our technical team.
Packaging & Supply
CheMost compound defoamers are stocked and shipped worldwide, with a typical lead time of 1–15 days and a 36-month shelf life at ambient temperature. Samples and quotations are answered within 12 hours.
Packaging
20 kg drum · 160 kg drum.
Minimum order
By drum — contact us for your quantity.
Incoterms
FOB · CIF · EXW, to suit your freight arrangement.
Loading ports
All major Chinese ports.
Frequently Asked Questions
What is an acrylate-based compound defoamer?
It is a polyacrylate foam inhibitor for lubricating oils (carrying a trace of silicone from manufacture) that controls foam with a low impact on air-release values and needs no dilution. Because polyacrylate is gentle on the oil’s surface tension, it deaerates better than a neat silicone — at the cost of being somewhat less aggressive at raw foam knockdown.
How is it different from a silicone defoamer?
A silicone (PDMS) defoamer gives the strongest surface-foam knockdown but lowers surface tension strongly and can slow air release, and it must be pre-diluted. The acrylate compound defoamer is gentler on surface tension, so it controls foam with less penalty to air release, and it is added without dilution.
T9100 or T9200 — which should I use?
Both are the same acrylate compound at the same specification. T9100 is the general-purpose grade with low impact on air release. T9200 is tuned for oils that contain sulfonate additives — sulfonate detergents are surface-active and stabilise foam, and T9200 gives enhanced foam suppression in those systems.
Why does it contain a trace of silicone?
The data sheet notes that, due to the manufacturing process, the product contains trace amounts of polydimethylsiloxane. The defoamer is acrylate-based; the residual silicone is incidental, not the main active, which is why it keeps the air-release advantage of a polyacrylate defoamer.
What treat rate should I use, and is dilution needed?
No dilution — just add. The application range is 30–200 ppm; dose to the lowest level that meets your ASTM D892 foam target, since over-dosing any antifoam can make foam worse. The exact level depends on the oil and its surface-active additives. Our technical team can assist.