However, because talc is a natural mineral, unfiltered natural talc may contain asbestos, which is harmful to health when inhaled into the lungs and is not suitable for direct use. At present, the European Union requires that all baby products and cosmetics containing talcum powder must use filtered talcum powder to avoid mixing with asbestos.
Extended data:
The main component of talc is magnesium silicate containing water in talc, and its molecular formula is Mg3[Si4O 10](OH)2. Talc belongs to monoclinic system. Occasionally, the crystals are pseudohexagonal or rhombic.
It is usually in the form of dense blocks, leaves, radiations and fibrous aggregate. Colorless, transparent or white, but it is light green, light yellow, light brown or even light red because it contains a small amount of impurities; Cleavage surface is pearl luster. Hardness 1, specific gravity 2.7 ~ 2.8.
Talc has excellent physical and chemical properties, such as lubricity, anti-sticking, flow aid, fire prevention, acid resistance, insulation, high melting point, chemical inactivity, good hiding power, softness, good luster and strong adsorption. Because the crystal structure of talc is layered, it tends to split into scales easily and has special lubricity. If the content of Fe2O3 is high, its insulation will decrease.
Talc is soft, its Mohs hardness coefficient is 1 ~ 1.5, and it is slippery, with {00 1} cleavage extremely complete, easy to split into thin slices, small natural angle of repose (35 ~ 40) and extremely unstable. The surrounding rock is silicified magnesite, magnesite, lean ore or.
Except for a few moderately stable ones, it is generally unstable, with developed joints and fissures, and the physical and mechanical properties of ore and surrounding rock have great influence on mining technology.
Uses: It is a high-quality filler in cosmetic industry. Features: contains a lot of silicon. It has the function of blocking infrared rays, thus enhancing the sunscreen and infrared resistance of cosmetics.
Talc is one of the minerals. It is buried underground with serpentine containing asbestos, so it often contains asbestos in its natural form. Neither the National Toxicology Project of the United States nor the Occupational Safety and Health Administration (OSHA) of the United States listed talc as a known or possible carcinogen, so there is no way to say that asbestos in talc is carcinogenic.
The American Association of Government Industrial Hygienists (ACGIH) also lists talcum powder as "a carcinogen that cannot be classified as human beings". Talc talcum powder is still used in America. According to the International Centre for Research on Cancer (IARC), "talc containing asbestos" is classified as a carcinogen.
References:
Baidu encyclopedia-talcum powder