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Explore our precision-engineered silicone oil products designed for mold release agents, reactive crosslinking, and advanced surface modification.
Hydrogen-terminated silicone oil (also referred to as Si–H terminated polydimethylsiloxane) is a specialized reactive silicone fluid in which both ends of the polymer chain are capped with Si–H (silane hydrogen) functional groups. Unlike standard trimethylsilyl-terminated PDMS, this terminal reactivity enables the fluid to participate in hydrosilylation crosslinking reactions, surface grafting, and addition-cure silicone rubber systems.
The molecular architecture — a flexible siloxane backbone terminated by reactive Si–H bonds — gives this material a uniquely balanced profile: low surface energy for outstanding release performance, thermal stability up to 200 °C, chemical inertness in most environments, and the ability to bond or crosslink with vinyl-functional partners via platinum-catalyzed addition reactions.
In the context of mold release agents, hydrogen-terminated silicone oil functions as a reactive release additive that can be cured onto mold surfaces, incorporated into semi-permanent release coatings, or blended into carrier systems for consistent, controllable release behavior across thousands of demolding cycles.
Why hydrogen-terminated silicone oil outperforms conventional release agents in demanding industrial environments.
Both chain ends carry active Si–H groups enabling platinum-catalyzed hydrosilylation with vinyl silicones, allowing covalent bonding to mold surfaces or integration into crosslinked networks for durable release performance.
The Si–O–Si backbone withstands continuous service temperatures up to 200 °C and intermittent peaks beyond 250 °C, making it ideal for rubber vulcanization molds, die-casting operations, and high-temperature composite layup.
Surface tension values of 20–22 mN/m ensure excellent non-stick behavior against polyurethane, epoxy, rubber, and thermoplastic substrates — enabling clean, damage-free demolding with minimal force.
Available in viscosity grades from 20 to 500 cSt, allowing formulators to tailor film thickness, spreading coefficient, and penetration depth for specific mold geometries and substrate porosity levels.
Resistant to dilute acids, alkalis, and most organic solvents. The cured release layer retains integrity through aggressive cleaning cycles, extending mold service life and reducing maintenance downtime.
High molecular weight grades exhibit extremely low vapor pressure, minimizing workplace VOC exposure. Compatible with REACH, RoHS, and food-contact regulatory frameworks when correctly formulated.
Standard parameters for Bayee hydrogen-terminated silicone oil used in mold release agent formulations.
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | Colorless to pale yellow transparent liquid | Visual |
| Viscosity @ 25 °C | 20 – 500 cSt (customizable) | ASTM D445 |
| Si–H Content | 0.08 – 0.18 mol/100 g | Titration / FTIR |
| Refractive Index @ 25 °C | 1.395 – 1.405 | ASTM D1218 |
| Flash Point | > 200 °C | ASTM D92 |
| Density @ 25 °C | 0.95 – 0.98 g/cm³ | ASTM D891 |
| Thermal Stability | Continuous use up to 200 °C | TGA |
| Chloride Content | ≤ 10 ppm | Ion Chromatography |
| Packaging | 25 kg / 200 kg drums; IBC available | — |
Hydrogen-terminated silicone oil delivers measurable performance advantages across a broad spectrum of mold release and reactive processing applications.
In compression and injection molding of EPDM, NBR, and silicone rubber, hydrogen-terminated silicone oil is applied as a reactive semi-permanent release coating. When cured at mold temperature (150–200 °C) via hydrosilylation, it forms a durable silicone film that survives hundreds of cycles without reapplication, dramatically reducing production downtime and product contamination risk.
Flexible and rigid PU foam seat cushions, dashboards, and door panels require consistent release with zero silicone transfer to bonding surfaces. H-terminated silicone oil in water-based emulsion release systems provides the required non-stick performance while maintaining paintability and adhesive bondability of finished parts — a critical requirement for Tier 1 automotive suppliers.
Carbon fiber reinforced polymer (CFRP) autoclave processing demands release agents that withstand 180 °C cure cycles, resist vacuum bag pressure, and leave zero residue on bonding surfaces. Hydrogen-terminated silicone oil-based release films satisfy these requirements and are compatible with epoxy and bismaleimide resin systems used in structural aerospace components.
Applied to steel and aluminum concrete formwork panels, diluted hydrogen-terminated silicone oil solutions provide a reactive release barrier that bonds to metal surfaces and prevents concrete adhesion. The treated surface reduces bug holes, improves architectural concrete finish quality, and extends formwork service life by protecting against alkaline concrete attack.
In tablet compression tooling and confectionery molds, ultra-pure grades of hydrogen-terminated silicone oil provide compliant, low-migration release layers. The Si–H functional groups enable covalent anchoring to metal surfaces, preventing transfer to pharmaceutical products and meeting FDA 21 CFR and EU 10/2011 food contact material standards.
Epoxy and silicone potting compound molds benefit from hydrogen-terminated silicone oil release coatings that prevent adhesion of encapsulant materials to tooling. The reactive coating survives repeated thermal cycling (−40 °C to +180 °C) encountered in electronics manufacturing, maintaining dimensional accuracy of encapsulated components across large production runs.
The global mold release agent market is undergoing rapid transformation driven by sustainability mandates, advanced manufacturing requirements, and material science innovation.
The global mold release agent market was valued at approximately USD 2.1 billion in 2023 and is projected to reach USD 3.2 billion by 2030, growing at a CAGR of ~6.2%. Reactive silicone-based systems — including hydrogen-terminated silicone oil formulations — are the fastest-growing segment, driven by demand from automotive, aerospace, and electronics sectors requiring higher-performance, longer-lasting release solutions.
Traditional solvent-based and sacrificial wax release agents are being displaced by reactive silicone systems that bond to mold surfaces. Hydrogen-terminated silicone oil is at the center of this transition: its Si–H functionality enables formulation of semi-permanent coatings that reduce per-part release agent consumption by up to 80%, lowering both material costs and environmental impact.
The explosive growth of EV production is generating new demand for high-performance mold release agents in battery cell encapsulation, structural composite body panels, and polyurethane battery module foam. Hydrogen-terminated silicone oil's compatibility with both thermoset and thermoplastic processing environments positions it as a key enabler of next-generation EV manufacturing.
Regulatory pressure from REACH, VOC emission limits, and corporate ESG commitments is accelerating the adoption of water-based silicone emulsion release systems. Hydrogen-terminated silicone oil is readily emulsifiable and can replace solvent-borne formulations without sacrificing performance, making it a strategic ingredient for manufacturers targeting green chemistry certifications and reduced environmental footprint.
Automated spray application systems in high-volume molding operations require release agents with precise rheological profiles and consistent batch-to-batch chemistry. The controlled molecular weight distribution and narrow viscosity specifications of Bayee's hydrogen-terminated silicone oil grades are designed to meet the exacting process control requirements of automated manufacturing environments.
The rise of continuous fiber thermoplastic composites, resin transfer molding (RTM), and large-format additive manufacturing is creating new mold release challenges. Hydrogen-terminated silicone oil's ability to function at elevated temperatures and pressures while maintaining film integrity makes it a critical material for next-generation composite tooling applications in aerospace, wind energy, and marine sectors.
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.
Years R&D & Export Experience
A trusted global supplier of specialty silicone chemicals with strategic manufacturing partnerships across China.
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. 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.
Contact Bayee Chemical today to request technical data sheets, samples, or a customized formulation consultation for your hydrogen-terminated silicone oil mold release application.
Get in Touch NowBayee's comprehensive silicone chemistry portfolio — engineered for mold release agents, surface treatment, crosslinking, and functional coating systems.
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