Major Breakthrough in Domestic Medical-Grade Methyl Silicone Oil; Cost of Disposable Syringes Expected to Drop


      For an extended period, the high-purity medical-grade methyl silicone oil used for lubricating disposable sterile syringe plungers, treating pre-filled syringe inner surfaces, and providing anti-stick lining for pharmaceutical vials has been largely monopolized by imported brands. However, recent reports from multiple domestic organosilicon material research and development entities indicate that domestically produced medical-grade methyl silicone oil, compliant with USP Class VI and ISO 10993 biocompatibility standards, has successfully completed pilot-scale validation and is now being supplied in small batches to several large infusion device manufacturers. This marks a substantive step forward in the localization of this critical material.
      The defining difference between medical-grade and ordinary industrial-grade methyl silicone oil lies in its exceptionally stringent purity requirements. Medical-grade products demand total residual cyclic siloxane (D3 to D10) levels below 50 ppm, heavy metal content below 1 µg/g, and the complete absence of any cytotoxic substances. The new generation of domestic medical methyl silicone oil employs a combined process of two-stage molecular distillation and high-precision activated carbon adsorption, successfully reducing cyclic content to below 30 ppm and metal catalyst residues to trace levels. In comparative lubrication performance tests, a 10ml syringe coated with this domestic product showed no statistical difference in plunger initial force and sustained force fluctuation range compared to imported products. Furthermore, accelerated aging tests revealed no migration or degradation of the silicone oil coating.
      Cost advantage is the primary driver behind domestic substitution. Currently, the landed price of imported medical-grade methyl silicone oil is approximately $120 to $180 per kilogram, whereas qualified domestic products are priced at $60 to $80, a reduction of over 50%. With the continued rollout of national centralized drug procurement, the prices of low-value consumables like disposable syringes and infusion sets have been compressed to extremely low levels, making downstream manufacturers highly sensitive to raw material costs. Therefore, the large-scale application of domestic methyl silicone oil will directly help medical device manufacturers lower production costs and strengthen their competitiveness in procurement tenders. The next R&D focus will be on developing specialized modified methyl silicone oils with antibacterial or drug-release functions, further expanding application prospects in advanced medical coatings.