Magnesium Silicate, Magnesium Silicate Hydroxide, Hydrated Magnesium Silicate, Talcum, Agalite, Talc Powder, Steatite, Soapstone, French Chalk, E553, 14807-96-6

Magnesium Silicate, Magnesium Silicate Hydroxide, Hydrated Magnesium Silicate, Talcum, Agalite, Talc Powder, Steatite, Soapstone, French Chalk, E553, 14807-96-6

TALC (MAGNESIUM SILICATE)

1. PRODUCT DEFINITION AND CHEMICAL IDENTITY

Note: Talc is a naturally occurring phyllosilicate mineral with a platy, lamellar crystal structure. It possesses the lowest value on the Mohs hardness scale (1), making it one of the softest known minerals. Due to its oil-absorbing, lubricating, filling, and heat-resistant properties, it is used across a vast industrial spectrum, from cosmetics and ceramics to plastics and paper. Cosmetic-grade talc must be of high purity and certified as asbestos-free.

2. PHYSICAL AND CHEMICAL PROPERTIES

3. FUNCTIONAL PROPERTIES AND MODE OF ACTION

• Lubricant and Slip Agent: Thanks to its lamellar crystal structure, its particles slide easily over one another. This property imparts a smooth, silky feel to cosmetic powders, prevents powders from sticking to dies during tablet manufacturing, and reduces friction and wear on machine parts.

• Filler and Extender: Adds bulk to products like plastics, rubber, paints, and paper, reducing cost and improving mechanical properties such as stiffness, impact resistance, and dimensional stability.

• Opacifier and Whitening Agent: Its high brightness and whiteness provide opacity and enhance whiteness in paints and coatings.

• Heat and Chemical Resistance: Due to its chemical inertness and high melting point, it is favoured in ceramic glazes, refractory materials, and laboratory bench tops.

• Oil and Moisture Absorber: Absorbs excess oil and moisture from the skin, providing a matte finish. This is the core function of cosmetic talcum powders.

4. TALC TYPES AND COMMERCIAL FORMS

5. SECTORAL APPLICATIONS AND USAGE RATES

6. ALTERNATIVE NAMES AND SYNONYMS

7. ALTERNATIVES AND COMPARISON

8. SAFETY, STORAGE, AND REGULATORY INFORMATION

• GHS Classification: Not classified as a hazardous substance. However, inhalation of fine dust may cause mechanical respiratory irritation.

• Asbestos Warning: Natural talc deposits can be found in association with asbestos, a carcinogenic mineral. Therefore, cosmetic and pharmaceutical grade talc must be certified as "asbestos-free." Reputable manufacturers rigorously test and document their products to ensure this.

• Cosmetic Safety: The Cosmetic Ingredient Review (CIR) panel has confirmed the safety of talc in cosmetic products, provided it is of an asbestos-free grade.

• Storage:

  • Store in a cool, dry, and well-ventilated area in tightly sealed packaging.

  • Protect from moisture; although talc is hydrophobic, it should be kept in a dry environment to prevent the powder from caking.

• Personal Protective Equipment (PPE): When handling large quantities with a risk of dusting, the use of a dust mask and safety goggles is recommended to prevent mechanical irritation.

• Packaging: Typically 25 kg kraft paper bags, cartons with PE inner liner, or 500-1000 kg big bags.

9. FREQUENTLY ASKED QUESTIONS

Q1: Is talcum powder safe?
Yes, cosmetic-grade talcum powder that is certified as asbestos-free and manufactured according to all regulatory standards is considered safe. Safety concerns have historically stemmed from risks associated with inhaling talc contaminated with asbestos. Today, cosmetic-grade talc undergoes rigorous testing to eliminate this risk.

Q2: What is the difference between talc and cornstarch?
Talc is a natural mineral (magnesium silicate) that provides excellent slip, softness, and oil absorption. Cornstarch is a plant-derived polysaccharide. Both are used in baby powders; however, talc provides a better slip feel, while cornstarch can become sticky upon contact with water.

Q3: Why is talc used in plastics?
Talc is one of the most common mineral fillers added to plastics. In automotive parts (bumpers, dashboards) and household appliances, it increases stiffness, impact resistance, and thermal stability while reducing production costs. It also improves the dimensional stability (control of thermal expansion/contraction) of plastics.

Q4: Is talc soluble in water?
No, talc is insoluble in water. It has a hydrophobic (water-repelling) nature, so it can be difficult to wet and disperse when mixed with water. However, it can be dispersed in aqueous systems with the aid of surfactants.

Q5: What is the role of talc in ceramics?
In ceramic glazes and bodies, talc acts as a high-temperature flux, lowering the firing temperature. It also increases thermal shock resistance, preventing ceramic ware from cracking during sudden temperature changes.

10. QUICK REFERENCE TABLE