Crude Vermiculite from the mine consists of golden to brown flakes which are carefully classified into five grades – each with a specified range of particle sizes, as detailed in the table below:

Grade Particle size distributionmin. 80% retained (mm) Loose bulkDensity kg/m3
LARGE -8.0 + 2.8 700 – 850
MEDIUM -4.0 + 1.4 800 – 950
FINE -2.0 + 0.710 850 – 1050
SUPERFINE -1.0 + 0.355 850 – 1050
MICRON -0.710 + 0.250 850 – 1050
* The above specified values may vary to the actual values

Exfoliated Vermiculite

Vermiculite is most widely used in its exfoliated form. The concertina-shaped granules of exfoliated vermiculite are non-combustible as well as being insoluble in water and all organic solvents. Safe and easy to handle, exfoliated vermiculite is available in the market place in five different grades as shown in the table below:

Volume Yields For Exfotliated Vermiculite

Grade Typical loose bulkdensities of product (kg/m3) per ton of crudevermiculite processed (m3)
MICRON 105 – 135 7.5 – 9.0
SUPERFINE 85 – 100 8.5 – 10.0
FINE 75 – 85 10.5 – 11.5
MEDIUM 70 – 85 11.5 – 13.0
LARGE 60 – 75 13.0 – 14.5
* The above specified values may vary to the actual values

The above values are those obtained by commercial operation and these values may vary for different designs of exfoliate.

pH Value 7.5 – 9.0
Thermal Conductivity 0.063 – 0.069 W/mºC under ambient
Specific Surface Area The specific surface area for exfoliated vermiculite, as measured by the nitrogen absorption technique, is typically:
Specific SurfaceArea m2/g
FINE 4.4

Chemical Analysis

The chemical analysis ofp both crude and exfoliated vermiculite is the same

Typical Ranges for Major Components
SiO2 35 – 46%
Al2O3 6.0 – 10.0%
Fe2O3 6.0 – 9.5%
MgO 21.5 – 25.5%
K2O 3.0 – 6.0%
Typical Ranges for Minor Components
CaO 2.0 – 6.0%
CO2 0.6 – 2.5%
TiO2 0.6 – 1.4%
F 0.2 – 0.8%
Cr2O3 0.01 – 0.10%
P 0.2 – 2.0%
Cl 0 – 0.5%
Angle of Repose 38º to 26º according to grade
Specific Heat 1.03 kJ.K. at 20ºC 1.05kJ/kg.K. at 30ºC
Specific Gravity 2.5 to 2.6 depending on the grade
Mohs Hardness Between 1 & 2
pH Value 8.5 to 10
Weight Loss At 105ºC – 4.5 to 6.5%. At 95ºC – 8.0 – 10.0%

1. Identification Of The Substance, Preparation And Company

Product Name : Vermiculite (All Grades)
Product Type : Exfoliated Vermiculite
Supplier : Shambhavi Minechem
No. 516, Vanijya Bhavan, Diwan Ballubhai Road, Kankaria, Kankaria,
Ahmedabad-380022, Gujarat, India

Material Uses/Applications: Applications are varied but include friction brake linings, high temperature insulation, loft insulation, construction products, animal feeds, horticulture and many other industrial applications.

2. Composition / Information On Ingredients

Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminum-iron silicates which resemble mica in appearance. When subjected to heat, crude vermiculite has the unusual property of exfoliating or expanding.

3. Hazards Identification

Hazards Identification
Routes of exposure Inhalation and Ingestion
Health hazards Vermiculite is of low acute toxicity, but prolonged exposure to any mineral dust could cause respiratory problems
Symptoms of exposure (Acute effects) None known
Symptoms of exposure (Chronic effects) Possible impairment of lung function after long-term exposure to dust levels in excess of OES- TWA
Medical conditions Any conditions aggravated by dust (e.g. asthma or pneumoconiosis) may be aggravated by exposure
Known synergists None known
Explosion hazards None
Fire hazards None
Corrosion hazards None

4. First Aid Measures

First Aid Measures
Skin contact Wash thoroughly with soap and water after use
Eye contact Irrigate thoroughly with water. Obtain medical advice if any pain or redness persists
Ingestion There are no known adverse effects. If ingested in large quantities, wash mouth out with water and give water to drink. Do not induce vomiting
Inhalation If inhaled in large quantities and mechanical irritation or discomfort occurs, allow the patient to rest in a well-ventilated room
Injection under pressure Not applicable
Antidote Not applicable
Advice to physicians No special requirements. In all cases should symptoms persist seek medical advise

5. Fire Fighting Measures

Non-flammable, no special precautions necessary.

Extinguishing media : Not applicable.
Special exposure hazard : Not applicable. Protective equipment : Not applicable.

6. Accidental Release Measures

Leaks and Spills : Vacuum spillages.
Personal precautions : No special requirements.
Environmental precautions : No special requirements.

7. Handling And Storage

Handling precaution: Avoid creating airborne dust wherever
possible. Where dust is generated then engineering dust control measures, e.g. LEV, should be considered.
Storage precautions: No special precautions. Shelf life: Indefinite. Specific uses: N/A

8. Exposure Controls/Personal Protection

Exposure Controls/Personal Protection
Exposure limit values As per HSE Guidance Notes EH40. See section 2.
Exposure controls Use appropriate engineering controls to
maintain dust levels below OES-TWA limits.
Respiratory protection Dust masks conforming to EN149 FFP2S or FFP3S should be used if OES-TWA limits are exceeded.
Personal protection No special precautions
Environmental exposure Ensure compliance with statutory environmental legislation controls.

9. Physical And Chemical Properties

Physical and Chemical Properties
Appearance and odor Flakes or powder, odor free.
Boiling point °C Not applicable.
Melting Point °C Approximately 1300°C
Flash point °C Not applicable
Flammability Nonflammable
Oxidizing property None
Vapor pressure mPa: Not applicable
Density at 20°C (Kg/m3) Variable depending on grade
Solubility Virtually insoluble
Specific gravity Approximately 2.8. (Water = 1)
Evaporation Rate Not applicable. (Butyl acetate = 1)
Partition coefficient Not applicable
pH value of 10% aqueous slurry Approximately 9
Gross molecular formula Variable
Viscosity Not applicable
Explosion limit Not applicable

10. Stability And Reactivity

Stability and Reactivity
Chemical stability Material is stable under normal ambient conditions
Conditions to avoid None
Materials to avoid None
Hazardous decomposition products None known
Hazardous polymerization Not applicable

11. Toxicological Information

Symptoms of overexposure for each potential route of exposure
Acute Toxicity: –
Oral LD50 (rat) (mg/kg) Dermal LD50 (rat) (mg/kg) Inhalation LC50 4hr(rat) (mg/l)
Not known but since vermiculite acts as an inert material in Acute Toxicity tests, LD50/LC50 values would be high.
Irritation to skin Can cause mild irritation
Irritation to eyes Can cause mild irritation
Respiratory sensitization
Skin sensitization
Repeated dose toxicity
Reproductive toxicity
Not known but information available shows material to be non-toxic. Chronic long- term respirable problems are possible

The review of available experimental data suggests that over exposure to respirable crystalline silica (RCS) dust can cause silicosis, a form of progressive pulmonary fibrosis. Long-term exposure to high levels of RCS dust can also lead to an increased risk of developing lung cancer. However, the phase 2 review carried out by the HSE (EH75/5) concludes that although RCS is a cause of lung cancer in humans, it is not a potent carcinogen. As a result of these findings CHAN35 has been issued by the HSE suggesting that for RCS, employers should aim to control exposures to 0.1mg/m3 (8hr TWA) or below. The HSE is not proposing a formal change to the MEL because a new system of Occupational Exposure Limits (OELs) is planned to be in place by the end of 2004, which is likely to overtake any new MEL developments

12. Ecological Information

Ecological Information
Eco toxicity
Persistence & degradability
Bio accumulative potential
Other adverse effects
No information available, but since the material is naturally occurring, unreactive, insoluble and non-biodegradable, no
Ecological problem is known or expected.

13. Disposal Information

Disposal Information
Containment techniques No special requirements
Clean-up procedures Vacuum preferred but simpler methods are acceptable
Waste disposal No special precautions necessary other than compliances with local regulations for non-hazardous materials

14. Transport Information

Transport Information
United Nations Number
ADR/RID Class:
Packing Group:
IMDG Code:
IMO Shipping name IATA Shipping name:
ADR Shipping name: RID Shipping name:
Not applicable as material is classified as non-hazardous

15. Regulatory Information

Regulatory Information
(EC regulatory Information) EC Supply labeling
Label name
Classification & Symbol: Risk Phrases
Safety Phrases
FAO Hazard labeling
Not applicable as material is classified as non-hazardous.

16. Other Information

Training : Training should be given to employees, in how to handle the material without generating dust or spillages.
Technical Contact Point : White Knight minerals #26-3-1186, 9th Street, Jyothi Nagar,
Vedayapalem Nellore, Andhra Pradesh – 524004, India
Emergency Telephone : +91-9866660002

Date Of Last Revision: 24 APRIL 2018


All information is given in good faith but without guarantee in respect of accuracy, and no responsibility is accepted for errors or omissions or the consequences thereof. It is the user’s obligation to determine the conditions of safe use of the material, all risks of use of the product are therefore assumed by the user and we expressly disclaim all warranties of every kind and nature, including warranties of merchantability and fitness for a particular purpose in respect to the use or suitability of the product.