There is nothing that kills brand loyalty faster than white residue on a black dress. For formulators, the challenge is matching the Refractive Index of the carrier to the antiperspirant active salt.
1. The Physics of "Invisibility"
White marks occur when light scatters as it passes through particles (AP salts) that have a different Refractive Index (RI) than the medium they are suspended in. To achieve transparency, you must match the RI of your carrier fluid to that of the active salt.
Technical Tip
Cyclopentasiloxane (SHINESIL™ CPS S2) has an RI of approx 1.396, which pairs excellently with many micronized Aluminum Chlorohydrate salts to minimize light scattering.
2. Fast Drying, Soft Feel
Consumers equate "wetness" with sweating. Therefore, the carrier fluid must evaporate rapidly upon application. SHINESIL™ CPS S2 is the ideal volatile carrier. It provides instant slip for a smooth glide, then evaporates within seconds, leaving a dry, powdery skin feel that consumers trust.
3. Preventing Valve Clogging (Aerosols)
In aerosol formats, stickiness can lead to nozzle clogging. Using a high-purity, low-viscosity silicone ensures that the suspension remains fluid and disperses evenly without agglomerating at the valve orifice.