Applications

DOWSIL™ OS-10 Fluid – Low-toxicity, ozone-safe silicone fluids for cleaning, rinsing, and industrial surface preparation.

  • Item Names: DOWSIL™ OS-10 Fluid, DOWSIL™ OS-20 Fluid, DOWSIL™ OS-30 Fluid

  • Manufacturer: The Dow Chemical Company

  • Technologies: Ozone-safe, low-toxicity methyl polysiloxane fluids

  • Color: Clear and colorless

  • Cure Type / Reactivity: Evaporative, no curing required

  • Package Size: Drums (~200 L / 52 gal), 25 L (6.5 gal) pails

  • Shelf Life: OS-10: 5 years; OS-20/OS-30: 4 years (original unopened containers, stored ≤ specified temperatures)

1. Product Overview

DOWSIL™ OS-10, OS-20, and OS-30 Fluids are high-purity, ozone-safe, and non-VOC methyl polysiloxanes designed as environmentally responsible alternatives to traditional solvents. They are clear, colorless, odorless, low in toxicity, and compatible with most plastics and coatings. These fluids fully evaporate at room temperature, leaving no residue, which allows subsequent coating, painting, or bonding. Their non-smog forming nature and negligible global warming contribution make them suitable for sustainable industrial use.

2. Applications

  • Rinsing parts after cleaning with stronger solvents without residue.

  • Cleaning optical devices, spectacle lenses, or sensitive substrates.

  • Impregnating wipes for delicate cleaning tasks.

  • Replacing hydrocarbon solvents in consumer formulations.

  • Serving as solvents or carriers for silicone oils or greases.

  • Cleaning and preparing surfaces prior to painting or bonding.

3. Typical Properties

The OS series demonstrates varied volatility, flammability, and drying rates to suit different industrial needs. OS-10 offers the fastest evaporation but is highly flammable, OS-20 balances volatility with safer handling, while OS-30 provides the slowest drying with a higher flash point, making it less flammable. All three exhibit low viscosity, low surface tension, and excellent spreading ability. Their mild cleaning action preserves sensitive substrates, and they degrade in the atmosphere into non-harmful byproducts. Storage stability ranges from four to five years under controlled conditions, ensuring reliable long-term use.

Property Unit OS-10 Fluid OS-20 Fluid OS-30 Fluid
Flash Point (Closed Cup) °C (°F) -3 (27) 34 (94) 57 (135)
Boiling Point °C (°F) 100 (212) 152 (306) 194 (381)
Vapor Pressure at 25°C mmHg 42.2 3.9 0.43
Latent Heat at BP cal/g 46 36 31
Drying Rate (Butyl Acetate=1) 3.8 0.7 0.14
Viscosity at 25°C cP 0.5 0.8 1.3
Specific Gravity 0.76 0.82 0.85
Surface Tension dynes/cm 15.2 16.5 17.3
Freezing Point °C (°F) -68 (-90) -82 (-115) -68 (-90)
Kauri-Butanol Value 17 15 13

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