polysilicone-15 polysilicone-15 polysilicone-15 (inci) is an organic compound used in hair products like shampoos, conditioners, hair sprays, pomades and color treatment products to absorb uvb radiation. in the eu, it is also approved for use in sunscreens and cosmetics. the absorption maximum is at about 310 nm. it is marketed as parsol slx by dsm. polysilicone-15 names iupac names α-(trimethylsilyl)-ω-(trimethylsilyloxy)poly-co-phenoxy}-1-methyleneethyl)silylene]-co-phenoxy)prop-1-enyl)silylene] other names parsol slx identifiers cas number 207574-74-1 y chemspider none echa infocard 100.102.446 unii f8drp5bb29 y properties appearance colorless or pale yellow liquid solubility in water practically insoluble solubility in organic solvents of medium polarity soluble pharmacology routes ofadministration local except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references the backbone chain is mainly composed of siloxane repeat units, and is of low molecular weight, so being classed as an oligomer.