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Explore our core silicone oil products engineered for industrial defoaming at high temperatures
High temperature silicone oil — also known as high-temp silicone defoamer or antifoam silicone fluid — is a class of polydimethylsiloxane (PDMS)-based specialty chemicals engineered to suppress, break, and prevent foam formation in industrial processes that operate at elevated temperatures, often exceeding 150°C to 300°C or beyond.
Unlike conventional water-based or mineral-oil defoamers that degrade rapidly under heat, high temp silicone oils maintain their chemical stability, surface activity, and antifoam efficiency across extreme thermal ranges. This unique property makes them indispensable across a wide spectrum of manufacturing sectors — from petrochemicals and paper mills to food processing and pharmaceutical production.
High temp silicone oil defoamers remain chemically stable and highly effective at temperatures from -40°C to over 300°C — outperforming every conventional antifoam technology available today.
Foam in industrial systems is not merely an aesthetic nuisance — it is a serious operational and economic problem. Foam reduces the effective volume of reactors and tanks, causes product overflow and material loss, impairs heat transfer efficiency, slows down filtration and separation processes, introduces air into products causing quality defects, and can even trigger safety incidents in pressurized systems.
In high-temperature environments, foam becomes even more problematic. Conventional organic defoamers decompose, lose viscosity, or evaporate under heat stress, leaving processes unprotected. High temp silicone oil addresses all these challenges with unmatched thermal durability and surface tension reduction capability.
The backbone of high temp silicone oil is the Si–O–Si (siloxane) linkage — one of the most thermally and chemically stable bonds in organic chemistry. This structure gives silicone oils their characteristic low surface tension (typically 20–21 mN/m), high thermal stability, low volatility, and chemical inertness. When dispersed in a foaming medium, silicone oil droplets rapidly spread across foam lamellae, displacing surfactants and causing the thin liquid films to rupture — instantly collapsing foam bubbles.
Modified variants — including methyl hydrogen silicone fluid, vinyl-functional silicone oil, hydroxy-terminated and hydrogen-terminated silicone fluids — expand the performance envelope further, enabling crosslinking, adhesion, and compatibility with diverse industrial matrices.
Effective from -40°C to 300°C+. Silicone oil retains its antifoam performance even in distillation columns, autoclaves, and high-pressure reactors where conventional defoamers fail completely.
Compatible with aqueous, non-aqueous, acidic, alkaline, and solvent-based systems. Works effectively in highly polar and non-polar industrial media without phase separation.
Surface tension as low as 20 mN/m enables rapid spreading and superior foam collapse at extremely low dosage rates — typically 10–500 ppm — reducing operating costs significantly.
Silicone defoamers provide sustained foam suppression rather than momentary knockdown, reducing the frequency of dosing and minimizing process interruptions in continuous operations.
Polydimethylsiloxane-based silicone oils are approved for food contact applications (FDA, EU regulations) and are widely used in food processing, pharmaceutical, and cosmetic manufacturing.
Silicone oil is non-conductive and non-corrosive to metals, plastics, and elastomers, making it safe for use in sensitive equipment and electrical insulation environments.
Where high temp silicone oil defoamers deliver the greatest impact
In crude oil distillation towers, vacuum distillation units, and catalytic cracking processes, foam formation can cause flooding of trays, reduction in separation efficiency, and unplanned shutdowns. High temp silicone oil defoamers — added at 5–50 ppm — prevent foam in distillation columns operating at 200–350°C, protecting tray efficiency and product purity without contaminating the hydrocarbon stream.
The pulping, washing, and bleaching stages of paper production generate massive amounts of foam due to the presence of lignin, resins, and surfactants in hot process liquors (70–100°C). Silicone-based defoamers are preferred over conventional mineral oil types because they work at lower dosage, resist high pH environments, and do not cause paper defects such as pitch deposits or surface spots.
In sugar refining, fermentation, cooking oil processing, and dairy production, foam control is essential for product quality and throughput. Food-grade silicone oil (PDMS, E900) is approved by FDA 21 CFR and EU Regulation EC No 1333/2008 for use in food processing at up to 10 mg/kg. It is used in deep-frying oils, sugar evaporation, wort boiling in brewing, and juice clarification processes.
Bioreactors and fermenters used in pharmaceutical manufacturing are highly prone to foam due to the presence of proteins, nutrients, and aeration. Silicone oil antifoams are the preferred choice because they are non-toxic, do not interfere with microbial metabolism, and are approved for pharmaceutical use. They are critical in the production of antibiotics, vaccines, enzymes, and recombinant proteins.
High-speed machining operations generate heat and foam in cutting fluid systems. Silicone oil defoamers added to water-based metalworking fluids prevent foam overflow, improve coolant delivery to the cutting zone, and extend fluid service life — even in systems operating at 60–90°C under high shear conditions.
In the production of concrete admixtures, waterproofing agents, and cement slurries, foam can reduce compressive strength and create voids. High temp silicone oil defoamers are incorporated into concrete mixing at 0.01–0.1% to eliminate entrapped air, improving density, strength, and durability of the final product.
During high-speed mixing and application of waterborne coatings, foam causes surface defects including craters, pinholes, and fisheyes. Silicone oil defoamers are used at 0.01–0.5% to eliminate micro-foam during production and application, especially in baking enamels and powder coatings that cure at 150–200°C.
Aeration tanks and biological treatment units in industrial wastewater facilities produce persistent foam from surfactants, proteins, and organic matter. Silicone oil-based antifoams are dosaged continuously or intermittently to control foam in aeration basins, sludge digesters, and flotation units, improving treatment efficiency and preventing foam overflow incidents.
The high temp silicone oil defoamer market is expanding rapidly across key industrial sectors worldwide
The global silicone defoamer market was valued at over USD 3.2 billion in 2023 and is projected to grow at a CAGR of 5.8% through 2030, driven by expanding industrial production in Asia-Pacific, increasing environmental regulations, and the shift from petroleum-based to silicone-based antifoam solutions.
China, India, South Korea, and Southeast Asian nations are the fastest-growing consumers of silicone defoamers, fueled by rapid industrialization in chemicals, textiles, paper, and food processing. China alone accounts for over 35% of global silicone oil production capacity, giving Chinese exporters like Bayee a significant competitive advantage.
Regulatory pressure on VOC emissions and toxic additives is accelerating the replacement of mineral oil and fatty acid-based defoamers with silicone alternatives. Silicone oils are non-volatile, non-toxic, and require far lower dosage rates, reducing the overall chemical load in industrial effluents and aligning with ESG manufacturing goals.
The development of modified silicone oils — including amino-functional, vinyl-functional, hydroxy-terminated, and hydrogen-terminated variants — is opening new application areas in electronics, advanced composites, and specialty coatings. These functional silicones offer tailored reactivity and compatibility beyond standard PDMS defoamers.
The post-pandemic expansion of biopharmaceutical manufacturing — including mRNA vaccines, monoclonal antibodies, and cell culture processes — is driving significant demand for pharmaceutical-grade silicone antifoams that meet stringent purity and regulatory standards (USP, EP, FDA).
Advanced manufacturing facilities are integrating real-time foam detection sensors with automated silicone oil dosing systems, optimizing antifoam consumption, reducing waste, and improving process consistency — a trend that is increasing the precision demand for high-purity, consistent-viscosity silicone defoamer grades.
Hangzhou Bayee Chemical Co., Ltd. started chemical products exporting from 2001, manufacturers based exporter focused in chemical products covering Silicone series, Phosphorus series including Silicone Monomers, Cyclosiloxane, Silicone Oils, Agro Chemicals, Fire Retardants & Auxiliaries etc. Company has direct Import & Export right, Dangerous Cargo Permission Certificate.
Based on 20+ years exporting history and persistent improvements, we have now grown and developed into a well known & good reputation exporter with ISO 9001:2015, AAA Credit certified company, also granted by local government as Healthy Enterprise, and A level Tax Ranking.
Based on strategic factories in Zhejiang, Jiangsu, Shandong, Anhui, Jiangxi, Hubei, Hunan, Hebei and Henan provinces etc, we export not only good quality products, competitive EXW costs, but also honesty, safety and international philosophies to customers. We work tightly with competitive production sites across whole China, who have special advantages, located in professional industrial areas, close to raw material bases, locally supplied with energy — gas or steam pipe connected with neighbour enterprises in same areas to reduce transportation costs.
Our factories have advanced ideas in technique crafts for higher yield production, unit consumption reducing from raw materials, also re-used the by-products for own downstream production for other products. By the way, we always keep close observation about raw material changing trend, react actively with factories shoulder by shoulder from organizing raw material at good times to secure more competitive production costs and share spaces with customers helping win their market shares. At the same time, we have wide connection with Chinese powerful chemical institute organizations for testing and supervising quality control in production process.
Up till now we've developed and supplied to many countries and areas all over the world, with main markets in European countries (Germany, Italy, UK, Spain, Ukraine, Russia, Poland, etc.), USA, South America, Mid East, South-east Asia, Australia, etc. Also seeking more strategic partners and customers under mutual benefits and work through the whole purchasing chain.
Bayee's full portfolio of silicone fluids — engineered for high-temperature defoaming across every industrial sector
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