Mica, a natural mineral, is widely used in the cosmetic industry, particularly in products like eyeshadow. Its shimmering properties give makeup a luminous finish, making it a popular choice among manufacturers. However, with increasing scrutiny regarding the safety and ethical sourcing of cosmetic ingredients, consumers are becoming more aware of the implications of mica in their beauty products. In this article, we will explore the safety of mica in eyeshadow and what you should consider when making your cosmetic choices.

มิก้ายังมีการใช้ในอุตสาหกรรมการก่อสร้าง โดยสามารถใช้เป็นส่วนผสมในคอนกรีต เพื่อเพิ่มความแข็งแรงและความทนทานต่อสภาพอากาศ นอกจากนี้ การใช้ผงมิก้ายังช่วยให้คอนกรีตมีการดูดซึมน้ำต่ำ และสามารถฉนวนความร้อนได้ดี

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Later, with the development of science and technology, people gradually realized that mica minerals have high insulation, high temperature resistance, strong acid and alkali resistance, and mica also began to enter building materials, fire, plastics, paper, rubber, pearlite pigments and other industries. These are mainly Muscovite and phlogopite.

Mica is a naturally occurring mineral that is prized in the beauty industry for its unique ability to provide shimmer and luminosity to products. Traditionally, mica has been sourced from mines, particularly in countries such as India and Madagascar. However, the mining process often involves severe labor abuses, including child labor and unsafe working conditions. Furthermore, mica mining contributes to environmental damage, including deforestation and ecosystem disruption.

Take pearlescent pigments as an example, pearlescent pigments are a class of pigments with pearl luster, which are deposited on the substrate (generally natural mica, synthetic mica, glass sheet and other sheet-like materials) above a layer or alternately deposited multiple layers of metal oxides or non-metallic oxides and formed a flat sandwich body with a structure similar to sandwich. Due to the difference in refractive index between the substrate and the oxide deposited on its surface and each oxide, when the light shines on the surface of the pearlescent pigment, the incident light will be refracted and reflected at the interface of each layer of the pearlescent pigment, and the color of the pearlescent pigment that people see is the result of the superposition of light after multiple refractions and reflections of the light, that is, the interference phenomenon of light.

Natural mica powder and synthetic mica powder also have great differences in electrical insulation, mechanical properties, chemical stability, application range and cost. Natural mica powder has good electrical insulation, but the volume resistivity is lower than that of synthetic mica. Synthetic mica powder has better electrical insulation properties, high volume resistivity and stable dielectric constant, and is suitable for high performance electrical insulation materials. The hardness of natural mica powder is relatively low (2-3), and it has good elasticity and peeling property. The hardness of synthetic mica powder is higher (between 3 and 4), and the tensile strength and compressive strength are better than that of natural mica powder. Natural mica powder is stable in acid-base solution, but it is easy to decompose at high temperature. Synthetic mica powder is stable to acid and base at room temperature, but will be slowly corroded by sulfuric acid above 300℃. Better thermal stability, not easy to release gas. Natural mica powder is widely used in electrical appliances, welding rods, rubber, plastics, paper making, paint and other fields. Synthetic mica powder is mainly used in high-end electrical insulation materials, aviation, aerospace, national defense industry and other high-tech fields. Because synthetic mica powder needs to be produced through complex chemical processes, its production cost is usually higher than that of natural mica powder. Therefore, in the market, the price of synthetic mica powder is often higher than that of natural mica powder. However, with the continuous progress of production technology and the gradual emergence of scale effects, the price of synthetic mica powder is expected to gradually decrease.