Product Identification

Product Name

2,2,4,4,6,6,8,8,10,10-Decamethyl-1,3,5,7,9,2,4,6,8,10-pentoxapentasilecane

Synonyms

Cyclic dimethylsiloxane pentamer
Dimethylsiloxane pentamer
Pentacyclomethicone

CAS

541-02-6

Formula

C10H30O5Si5

Molecular Weight

370.77

EINECS

208-764-9

RTECS

GY5945200

RTECS Class

Primary Irritant

Merck

12,2905

Beilstein/Gmelin

1800166

Beilstein Reference

4-04-00-04128

Physical and Chemical Properties

Appearance

Colorless liquid.

Solubility in water

(20 C) insoluble

Melting Point

-44

Boiling Point

101 (20 torr)

Density

0.958 g/cm3 (25 C)

Usage

Intermediate for silicone fluids.

Refractive Index

1.3980 (20 C)

First Aid Measures

Ingestion

If swallowed, wash out mouth with water provided person is conscious. Call a physician.

Inhalation

If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.

Skin

In case of contact, immediately wash skin with soap and copious amounts of water.

Eyes

In case of contact, immediately flush eyes with copious amounts of water for at least 15 minutes.

Handling and Storage

Storage

Keep tightly closed. Keep away from heat and open flame. Store in a cool dry place.

Hazards Identification

Inhalation

Vapors may cause dizziness or suffocation. May cause irritation or burns.

Skin

Causes skin irritation. Multiple Routes: May be harmful by inhalation, ingestion, or skin absorption. Vapor or mist is irritating to the eyes, mucous membranes, and upper respiratory tract.

Eyes

See Skin.

Hazards

Emits toxic fumes under fire conditions. Combustible liquid.

UN (DOT)

1993

Exposure Controls/Personal Protection

Personal Protection

Compatible chemical-resistant gloves. Chemical safety goggles.

Respirators

Government approved respirator.

Exposure Effects

Properties of this material have not yet been prepared. Any recommendations are of a general nature. Many chemicals cause irritation of the eyes, skin, and respiratory tract. In severe cases respiratory tract irritation can progress to ARDS/acute lung injury which may be delayed in onset for up to 24 to 72 hours in some cases Irritation or burns of the esophagus or gastrointestinal tract are also possible if caustic or irritant chemicals are ingested. ALWAYS contact your local poision control authority or medical professional for assistance.

Fire Fighting Measures

Flash Point

55

Fire Fighting

Extinguish using Carbon dioxide, dry chemical powder, or appropriate foam. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.

Fire Potential

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.

Accidental Release Measures

Small spills/leaks

Cover with dry lime or soda ash, pick up, keep in a closed container, and hold for waste disposal. Ventilate area and wash spill site after material pickup is complete.

Stability and Reactivity

Stability

Stable at normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents.

Decomposition

Carbon monoxide, Carbon dioxide, Silicon oxide, Formaldehyde.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

1993

Packing Group

III

HS Code

2931 00 95