Silicone Antifoam Agent for Lubricants (PDMS)

Name: Silicone Antifoam Agent for Lubricants (PDMS)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 9006-65-9

Polydimethylsiloxane (PDMS) silicone fluid is the most widely used antifoam agent in engine oils, gear oils, and industrial lubricants, providing effective foam suppression at extremely low treat rates (1–5 ppm). PDMS reduces surface tension at the air-oil interface, causing rapid foam bubble collapse. It is included in virtually every modern automotive and industrial lubricant formulation to meet sequence foaming test requirements (ASTM D892, Sequence I-III).

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Technical Specifications

appearance	Clear colorless to slightly hazy liquid
flash point	>300 °C
silicon content	37–38 wt%
viscosity (25°C)	100–1000 mm²/s (grade dependent)
active PDMS content	≥99.0 wt% (neat) or 10–30% (emulsion)
treat rate in finished oil	1–10 ppm

Applications

Engine oil foaming control (ASTM D892 sequence I, II, III compliance)
Gear oil and axle oil foam suppression in high-speed applications
Hydraulic oil antifoaming for hydraulic system efficiency
Automatic transmission fluid foam prevention
Industrial turbine and compressor oil foam control

Key Features

Extremely effective foam control at ultra-low treat rates (1–5 ppm) minimizing cost impact
Broad chemical compatibility with nearly all lubricant base oils and additive packages
Thermally stable up to 200°C ensuring antifoam persistence throughout the oil drain interval
Available as neat PDMS fluid or pre-dispersed concentrate for easy blending into lubricant bases