elemental silicon,,,,,,,,safe ? ? .....not by this reading

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hum, found one here

http://www.osha.gov/web/dep/chemicaldata/ChemicalResult.asp?RecNo=421

OSHA/EPA Occupational Chemical Database - Full Report

Chemical Name: SILICON

CAS #: 7440-21-3

Synonyms: Elemental silicon

Personal Protection & Sanitation First Aid

Skin: N.R.

Eyes: Prevent eye contact

Wash skin: N.R.

Remove: N.R.

Change: N.R.

Eye: Irr immed

Breath: Fresh air

Swallow: Medical attention immed

(See procedures

DOT Emergency Response Guidebook (ERG 2004)

Guide Number: 170170 Metals (Powders, Dusts, Shavings, Borings, Turnings, or Cuttings, etc.)

POTENTIAL HAZARDSFIRE OR EXPLOSION* May react violently or explosively on contact with water.* Some are transported in flammable liquids.* May be ignited by friction, heat, sparks or flames.* Some of these materials will burn with intense heat.* Dusts or fumes may form explosive mixtures in air.* Containers may explode when heated.* May re-ignite after fire is extinguished.

HEALTH* Oxides from metallic fires are a severe health hazard.* Inhalation or contact with substance or decomposition productsmay cause severe injury or death.* Fire may produce irritating, corrosive and/or toxic gases.* Runoff from fire control or dilution water may cause pollution.

PUBLIC SAFETY* CALL Emergency Response Telephone Number on Shipping Paper first. IfShipping Paper not available or no answer, refer to appropriatetelephone number listed on the inside back cover.* Isolate spill or leak area immediately for at least 25 to 50 meters(80 to 160 feet) in all directions.* Stay upwind.* Keep unauthorized personnel away.

PROTECTIVE CLOTHING* Wear positive pressure self-contained breathing apparatus (SCBA).* Structural firefighters' protective clothing will only provide limitedprotection.

EVACUATIONLarge Spill* Consider initial downwind evacuation for at least 50 meters (160 feet).Fire* If tank, rail car or tank truck is involved in a fire, ISOLATE for800 meters (1/2 mile) in all directions; also, consider initialevacuation for 800 meters (1/2 mile) in all directions.

EMERGENCY RESPONSEFIRE* DO NOT USE WATER, FOAM OR CO2.* Dousing metallic fires with water may generate hydrogen gas, anextremely dangerous explosion hazard, particularly if fire is in aconfined environment (i.e., building, cargo hold, etc.).* Use DRY sand, graphite powder, dry sodium chloride based extinguishers,G-1 or Met-L-X powder.* Confining and smothering metal fires is preferable rather than applyingwater.* Move containers from fire area if you can do it without risk.Fire involving Tanks or Car/Trailer Loads* If impossible to extinguish, protect surroundings and allow fire toburn itself out.

SPILL OR LEAK* ELIMINATE all ignition sources (no smoking, flares, sparks or flamesin immediate area).* Do not touch or walk through spilled material.* Stop leak if you can do it without risk.* Prevent entry into waterways, sewers, basements or confined areas.

FIRST AID* Move victim to fresh air.* Call 911 or emergency medical service.* Apply artificial respiration if victim is not breathing.* Administer oxygen if breathing is difficult.* Remove and isolate contaminated clothing and shoes.* In case of contact with substance, immediately flush skin or eyes withrunning water for at least 20 minutes.* Keep victim warm and quiet.* Ensure that medical personnel are aware of the material(s) involved,and take precautions to protect themselves.

Additional Emergency Response Information (CAMEO Data)

Non-fire Spill Response: Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. ( AAR, 1999)

Firefighting: Solid streams of water may spread fire. Use water in flooding quantities as fog. Use dry chemical, graphite, or dry earth. ( AAR, 1999)

Reactivity: CHEMICAL PROFILE: Selenium, silicon, or sulfur ignites in fluorine gas at ordinary temperatures (Mellor 2:11-13 1946-47). Silicon burns spontaneously in gaseous chlorine. A mixture of silicon, aluminum, and lead oxide explodes when heated (Mellor 7:657 1946-47). When a mixture of amorphous silicon and an alkali carbonate is heated, a vigorous reaction attended by incandescence occurs (Mellor 6:164 1946-47). Silicon (powdered) reacts violently with silver fluoride (Mellor 3:389 1946-47). The reaction of silicon and sodium-potassium alloy forms sodium silicide, which is spontaneously flammable in air (Mellor 2 Supp. 2:564 1961). (REACTIVITY, 1999)

First Aid: Eye: If this chemical contacts the eyes, immediately wash the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately. Contact lenses should not be worn when working with this chemical. Breathing: If a person breaths large amounts of this chemical, move the exposed person to fresh air at once. Other measures are usually unnecessary. Swallow: If this chemical has been swallowed, get medical attention immediately. (NIOSH, 1997)

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