As of the date of preparation of this material safety data sheet, the foregoing information is believed to be accurate and is provided in good faith to comply with applicable Federal and State law(s). However, no warranty or representation with respect to such information is intended or given.

—prepared by: Brian K. Jeppsen

Date Issued: 10/18/2001 • Date Revised: N/A • Revision No. 0
HMIS Ratings  NFPA
Health * Health *
Flammability 0 Flammability 0
Reactivity 0 Reactivity 0
Personal Protection E Special Hazards 0
HMIS Ratings:  0 = Minimal Hazard
E = Dust Respirator
NFPA Ratings:  0 = Insignificant: 
1 = Slight
Both: * = Refer to data on MSDS  


Product Identification

Trade Name Perlite (All Expanded Grades)
Chemical Name Sodium Potassium Aluminum Silicate
Formula Mixture
CAS Number 93763-70-3
Manufacturer's Name Hess Perlite
100 Hess Drive, Malad, Idaho 83252 • (202) 766-4777


Product Ingredients

Ingredient Name CAS No. % OSHA PEL ACGIH TLV
Perlite, Ore 93763-70-3 100 15 mg / m³ (Total)
5 mg / m³ (Respirable)
10 mg / m³ (Total)
3 mg / m³ (Respirable)
This product may contain crystalline silica (quartz) at below detectable levels (<0.05%); CAS No. 14808-60-7; OSHA PEL <0.05 mg / m³ (respirable).


Physical Data

Physical State Solid
Appearance and Odor White Powder, Odorless
Boiling Point N/A
Freezing Point N/A
Vapor Pressure
(MM Hg / 70º F)
Vapor Density (Air = 1) N/A
Specific Gravity 2.33
Solubility in Water Negligible
Percent Volatiles by Volume N/A


Fire and Explosion Data

Flash Point Nonflammable
Flammability Limits N/A
Extinguishing Media N/A
Unusual Fire and Explosion Hazards None
Special Fire Fighting Procedures None


Health Hazards

SummaryPerlite is a naturally occurring volcanic glass consisting of fused sodium* potassium* aluminum silicate. OSHA has classified perlite as a Particulate Not Otherwise Regulated (PNOR), which has the same Permissible Exposure Limit (PEL) as that is used for nuisance and inert dusts. Although there are no published reports of adverse health effects from exposure to perlite dust, dust levels should be maintained below the OSHA PEL for PNORs and respirators should be used when airborne dust is present. Excessive inhalation over long periods of time may cause harmful irritation. Perlite is considered a nuisance dust by ACGIH.
Medical conditions which may be aggravated Pre-existing upper respiratory and lung disease such as, but not limited to bronchitis, emphysema and asthma.
Target Organs Lungs, Eyes
Route of Entry Inhalation, dust contact with eyes.
Acute Health Effects Transitory upper respiratory irritant.  May cause coughing or throat irritation.
Chronic Health Effects Excessive inhalation of any mineral dust can overload the lung clearance mechanism.


Reactivity Data

Stability Stable
Chemical Incompatibilities Hydrofluoric Acid
Conditions to avoid None in designed use. Avoid contact with hydrofluoric acid.
Hazardous Decomposition Products May react with hydrofluoric acid to form toxic Section VII silicon tetrafluoride gas.


Precautions For Safe Handling and Use

Personal Protective Equipment Adequate protective devices, such as an N95 respirator, is recommended when the PEL is exceeded and/or when dust is present.
Gloves Not normally required.
Goggles Goggles to prevent dust from entering the eyes.
Engineering controls Local if necessary to maintain allowable PEL or TLV levels.
Leak and Spill Procedures Vacuum clean spillage. Wet sweep or wash away. Avoid creating dust.
Waste Management Dispose in accordance with federal, state and local regulations. Perlite is not considered a hazardous waste under RCRA (40CFR Part 261)
Handling Procedures Repair or properly dispose of broken bags. Maintain good housekeeping procedures.
Storage Segregation Hazard Classes N/A
Special Shipping Instructions None

Section VIII

First Aid Measures

Skin Not absorbed by the skin. May cause dryness. Use moisture renewing lotions if dryness occurs.
Eyes May cause irritation or inflammations. Flush eyes with copious quantities of water. If irritation persists, call a physician.
Inhalation Acute inhalation can cause dryness of the nasal passages and congestion of the upper respiratory tract. Remove to fresh air.  Drink water to clear throat and blow nose to evacuate dust.
Ingestion Short-term exposures not considered harmful.  Drink water to reduce bulk.