Chemical Datasheet


Chemical Identifiers

CAS Number UN/NA Number DOT Hazard Label USCG CHRIS Code
none none data unavailable none
NIOSH Pocket Guide International Chem Safety Card
Soapstone (containing less than 1% quartz) none
NFPA 704
data unavailable
General Description
A soft rock with a soapy feel. Composed of the mineral talc [Mg3Si4O10(OH)2] together with some chlorite [(Fe, Mg, Al)6(Si, Al)4O10(OH)8], and often some magnetite (Fe3O4).

Resists heat and acid. An excellent electrical insulator. Used for counter tops, sinks, and electrical switchboards, and as an filler material in paints, rubbers, roofing materials, ceramics and insecticides.


Reactivity Alerts
Air & Water Reactions
No rapid reaction with air. No rapid reaction with water.
Fire Hazard
No information available.
Health Hazard
Excerpt from NIOSH Pocket Guide for Soapstone (containing less than 1% quartz):

Exposure Routes: Inhalation, skin and/or eye contact

Symptoms: Pneumoconiosis: cough, dyspnea (breathing difficulty); digital clubbing; cyanosis; basal crackles, cor pulmonale

Target Organs: Respiratory system, cardiovascular system (NIOSH, 2023)
Reactivity Profile
SOAPSTONE is chemically unreactive or nearly unreactive in most circumstances. May be attacked by gaseous hydrogen fluoride or hydrofluoric acid.
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

No information available.

Response Recommendations

Isolation and Evacuation
No information available.
No information available.
Non-Fire Response
No information available.
Protective Clothing
Excerpt from NIOSH Pocket Guide for Soapstone (containing less than 1% quartz):

Skin: No recommendation is made specifying the need for personal protective equipment for the body.

Eyes: No recommendation is made specifying the need for eye protection.

Wash skin: No recommendation is made specifying the need for washing the substance from the skin (either immediately or at the end of the work shift).

Remove: No recommendation is made specifying the need for removing clothing that becomes wet or contaminated.

Change: No recommendation is made specifying the need for the worker to change clothing after the workshift. (NIOSH, 2023)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
Excerpt from NIOSH Pocket Guide for Soapstone (containing less than 1% quartz):

Eye: IRRIGATE IMMEDIATELY - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.

Breathing: RESPIRATORY SUPPORT - If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible. (NIOSH, 2023)

Physical Properties

Chemical Formula:
  • H2Mg3O12Si4
Flash Point: data unavailable
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: data unavailable
Vapor Pressure: 0 mmHg (approx) (NIOSH, 2023)
Vapor Density (Relative to Air): data unavailable
Specific Gravity: 2.7 to 2.8 (NIOSH, 2023)
Boiling Point: data unavailable
Molecular Weight: 379.3 (NIOSH, 2023)
Water Solubility: Insoluble (NIOSH, 2023)
Ionization Energy/Potential: data unavailable
IDLH: 3000 mg/m3 (NIOSH, 2023)

AEGLs (Acute Exposure Guideline Levels)

No AEGL information available.

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

No PAC information available.

Regulatory Information

EPA Consolidated List of Lists

No regulatory information available.

CISA Chemical Facility Anti-Terrorism Standards (CFATS)

No regulatory information available.

OSHA Process Safety Management (PSM) Standard List

No regulatory information available.

Alternate Chemical Names