What Is Silicone? Relationship with Sand & Glass
Silicon (Si) ranks second in crustal abundance, mostly existing as inorganic silica or silicates in sand, glass and ceramics. Inorganic silicon is rigid and brittle, unable to form elastic soft materials.
Silicones (organosilicon materials) refer to polymers containing Si–C bonds and organic side groups on the –Si–O–Si– backbone. This semi-inorganic, semi-organic structure gives silicones combined merits of inorganic glass and organic polymers. Industrialized in the 1940s, silicones are known as “industrial monosodium glutamate”: low dosage yet irreplaceable in countless industries.
Molecular Structure & Key Performance
The high-energy Si–O main chain grants outstanding heat resistance, weatherability and chain flexibility. Side groups (methyl, phenyl, vinyl, fluoroalkyl) are adjustable to tailor properties.
Core advantages: wide service temperature range (-50~200℃), excellent UV/ozone resistance, elasticity, water repellency, stable electrical insulation, chemical inertness and controllable surface tension. Limitations include swelling in hydrocarbon solvents and degradation under strong acid/alkali.
Industrial Chain & Main Product Categories
The chain follows: metal silicon → silicone monomers → intermediates (DMC, D4) → finished silicone products.
Main products: silicone rubber (HTV, RTV, LSR), silicone oils & modified silicones, silicone resins, silane coupling agents, silicone gels/potting compounds, silicone PSA & release coatings, specialty fluoro-silicones.
Major Application Sectors
Construction sealants, electronics & new energy potting, automotive sealing, personal care, medical devices and industrial defoamers.
FAQ Highlight
Silicone rubber differs from conventional carbon-chain rubbers for superior thermal and weathering resistance. Additive cure silicone features no by-products while condensation cure silicone is cost-effective.
Not all silicones are food/medical grade; relevant compliance standards must be verified for end use.
Disclaimer: This article is for industry reference only.
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