Aminofunctional Fluid (Amino-functional Polydimethylsiloxane)

Aminofunctional fluid (CAS 102782-92-3) is a category of aminoethylaminopropyl-terminated polydimethylsiloxane copolymers. The amine groups give the polymer affinity for paint surface chemistry, while the siloxane backbone delivers hydrophobic film properties. It is the ceramic active in several spray-on sealant products including Gtechniq C2 Liquid Crystal (Section 3 discloses the CAS at 0.1–10%). At the pure-substance level the material is GHS-classified for skin irritation (H315 Cat 2). At consumer-product dilutions of 0.1–10% in a water carrier, the finished product is normally not classified — and Gtechniq's C2 SDS is a clean example of this: Section 2 reports "Not classified" even though Section 3 discloses this CAS as the only hazardous component. The amine-functional chemistry is not PFAS, contains no fluorine, and has no aquatic toxicity H-code assigned in current SDS databases. Aquatic biodegradability is unconfirmed (most siloxane polymers are not readily biodegradable in the OECD sense, but bioaccumulation potential is low because of high molecular weight). Use concentrations in consumer products are small enough that environmental impact per application is minor.