GK-VS-245 · Cyclopentasiloxane (D5)

Safety Data Sheet · 16 sections · GHS / CLP compliant

01 Identification

Trade name	GK-VS-245 Cyclopentasiloxane
Chemical name	Decamethylcyclopentasiloxane
CAS №	541-02-6
Recommended use	Cosmetic ingredient (carrier solvent)
Manufacturer	GK Silicones
Emergency contact	technical@gksilicones.com

GHS Classification	Aquatic Chronic 4 (H413)
Signal word	None required
Hazard statements	H413 — May cause long-lasting harmful effects to aquatic life
Precautionary	P273 — Avoid release to environment. P501 — Dispose per local regulation.

Component	CAS	%
Cyclopentasiloxane (D5)	541-02-6	≥ 99.5%
D4 (residual)	556-67-2	≤ 0.05%

First aid: Rinse eyes with water. Wash skin with soap. Move to fresh air if exposed to mist. Material is non-irritating in normal handling.

Fire-fighting: Suitable media: CO₂, dry chemical, foam, water spray. Flash point ≥ 76 °C (closed cup).

Spill: Floors may become slippery. Contain with inert absorbent. Prevent entry to drains.

Handling: Use in well-ventilated areas. Keep containers closed. Store 5 – 30 °C, away from sunlight.

Exposure: Safety glasses, nitrile gloves recommended. DNEL (worker, dermal) 25 mg/kg bw/day.

Stability: Stable under normal storage. Avoid strong oxidisers and temperatures > 200 °C.

Toxicology: Acute oral LD₅₀ (rat) > 5,000 mg/kg. Not irritating. Not sensitising. Negative Ames test.

Ecology: Persistent in environment; not readily biodegradable. Bioaccumulative (vB). Not classified PBT or vPvB.

Disposal: Dispose per local, regional, national regulations. EWC code 07 06 04*.

Transport: UN 3082, Class 9, PG III, Marine pollutant (Environmentally Hazardous Substance, Liquid, n.o.s.).

Regulatory: Listed on EU REACH, TSCA (USA), DSL (Canada), IECIC China, ENCS Japan, KECI Korea, AICIS Australia, ASEAN Cosmetic Directive.