The dry, non-greasy after-feel of a good antiperspirant or deodorant is engineered, not accidental — and in many formulas the ingredient doing that work is a small, volatile disiloxane that spreads fast and then leaves without a trace.

IOTA 20577 is diethyl tetramethyl disiloxane (1,3-diethyltetramethyldisiloxane, CAS 2295-17-2): a colorless, odorless, transparent liquid. At 0.97 cP (25°C) it is one of the most mobile silicone fluids available, spreading actives evenly before evaporating cleanly — the dry-touch carrier behavior antiperspirant, deodorant, skin lotion, sunscreen and cosmetic formulators look for. The same fluid serves a second, very different duty: with a pour point of -120°C, it is suitable for closed-system low-temperature oil baths, where common bath fluids would already be solid or too viscous.

Technical specifications (per official product page):

• Chemical name: diethyl tetramethyl disiloxane (1,3-diethyltetramethyldisiloxane)

• CAS: 2295-17-2

• Appearance: colorless, odorless, transparent liquid

• Viscosity (25°C): 0.97 cP

• Density (25°C): 0.813–0.818 g/cm³

• Pour point: -120°C

Applications:

1. Personal care: antiperspirants, deodorants, skin lotions, sunscreens and cosmetics — volatile carrier and dry-touch emollient.

1. Closed-system low-temperature oil baths.

Packaging and storage: 200 L plastic drums or 1000 L IBC tanks. Store in a Category C warehouse, away from strong acids, strong bases and oxidizing agents. Classified as non-hazardous; transport as general cargo, handle with care to avoid packaging damage. Shelf life: 24 months.

Specs and product page → Diethyl Tetramethyl Disiloxane IOTA 20577