Overview
Amorphous silicon dioxide, or amorphous SiO₂, is a synthetic form of silicon dioxide lacking a crystalline structure. Unlike quartz or cristobalite, its particles are randomly arranged, resulting in unique properties such as high surface area and porosity. It is produced through vapor-phase hydrolysis (e.g., fumed silica) or wet processes (e.g., precipitated silica). Due to its versatility, amorphous SiO₂ is a critical additive in industries ranging from construction to food. It acts as a thickener, anti-caking agent, or reinforcement filler, depending on the formulation. Its non-toxic nature and compliance with regulatory standards (e.g., FDA, REACH) further broaden its applications.
Physical and Chemical Properties
Amorphous silicon dioxide exhibits a high surface area (50–400 m²/g), which enhances its adsorption and reinforcement capabilities. Its thermal stability allows it to withstand temperatures up to 1,000°C without structural changes, making it suitable for high-heat environments. Chemically, it is inert to most acids (except hydrofluoric acid) and alkalis, ensuring compatibility in diverse formulations. The material’s low bulk density (0.03–0.1 g/cm³ for fumed silica) contributes to its lightweight yet strong performance in composites. Its refractive index (~1.46) also makes it useful in optical coatings.
Main Applications
In coatings and adhesives, amorphous SiO₂ improves viscosity control and mechanical strength. For example, it prevents sagging in paints and enhances the durability of silicone sealants. The electronics industry uses it as a dielectric material or polishing abrasive for semiconductors. Pharmaceuticals employ it as an excipient to improve tablet flow, while food-grade silica prevents clumping in powders like spices. Its role in tire manufacturing (as a reinforcing filler) reduces rolling resistance, boosting fuel efficiency. Emerging applications include battery separators and 3D printing materials.
Safety and Storage
While amorphous SiO₂ is generally non-toxic, airborne particles can cause respiratory irritation. Workplaces should enforce dust control measures (e.g., ventilation, NIOSH-approved masks) and provide material safety data sheets (MSDS). Storage requires airtight containers to prevent moisture absorption, which can alter flow properties. Avoid contact with strong acids, particularly hydrofluoric acid, which dissolves silica. For large-scale handling, electrostatic discharge (ESD) precautions may be necessary due to its insulating nature.
B2B Procurement Guide
Buyers should prioritize suppliers that provide certificates of analysis (CoA) detailing purity (≥99% for high-end uses), particle size distribution (e.g., 7–40 nm for fumed silica), and moisture content. Surface-treated variants (e.g., hydrophobic silica) are preferred for polymer composites. Bulk purchases (tonnage) typically offer cost advantages, but verify logistics compatibility—silica’s low density may increase shipping costs volumetrically. Regional suppliers in China, Europe, and the U.S. dominate production, with prices influenced by energy costs and silica feedstock availability.
Related Manufacturers
- 主营：钛白粉、蜡粉、消光粉、碳黑、白碳黑
- 主营：澄清剂、抛光粉、催化剂、丙三醇、手感剂、成核剂、氧化铝、石墨粉、脱模剂、半导体、清洗剂、粘合剂、紫胶片、硅油、硅胶、硅藻土、光扩散剂、硅乳液、有机硅微球、氟化液、阻燃剂
- 主营：依地酸、防腐剂、防锈剂、沉淀法二氧化硅、消泡剂、白炭黑、阻垢剂、ph升高剂、橡胶碳黑、印染颜料、保温材料、泳池澄清剂、胶带用碳黑、粘泥剥离剂、水处理药剂、防腐防霉剂、聚铝絮凝剂、植物除臭剂、养殖除臭剂、泳池除藻剂、高效预膜剂、2%异噻唑啉酮、反渗透清洗剂、切削液除臭剂、反渗透杀菌剂、反渗透还原剂
- 主营：透明粉、玻璃粉、功能粉体材料、无机粉体材料、无水透明粉、超细滑石粉、改性硅微粉、超细硅微粉
- 主营：蛭石粉、沸石粉、麦饭石粉、二氧化硅白炭黑、保温涂料、防火涂料、彩色树皮、耐火材料、珍珠岩粉、树皮、彩色玻璃珠、生物质颗粒、纳米陶瓷仿瓷砂、兰花栽培基质、白炭黑、钙粉、重晶石、滑石粉、金刚砂、硅藻土、氧化铁、膨润土、椰糠、高岭土
- 主营：白炭黑、色素炭黑、特种炭黑、气相二氧化硅、疏水气相二氧化硅、疏水沉淀二氧化硅、改性二氧化硅、定制炭黑
- 主营：酶标条、酶标板、移液器、二氧化硅、凸面带、200加长、锥形瓶、pcr八连、聚丙烯、管管盖、移液管、过滤板、培养皿、吸头盒、冷冻管、培养瓶、离心瓶、深孔板、pcr管盒、连排管、反应板、八连管、避光管、螺口管、带滤芯、离心管
- 主营：桶装优势 酯类:PMA丙二醇甲醚醋酸、二乙二醇丁醚DB、精丙、无水乙醇、无水丁酯、无水乙酯、乙二醇丁醚BCS、二丙酮醇、甲缩醛、甲醇、异丙醇、二甲苯、环己酮、乙二醇乙醚醋酸酯、乙二醇二醋酸酯、二丙二醇甲醚醋酸酯、丙二醇二乙酸酯、二丙二醇丁醚DPNB、二丙二醇甲醚、甲基异丁基甲酮、甲基丙烯酸羟丙酯、丙烯酸乙酯、甲基环己烷、二价酸酯
- 主营：聚乙烯醇、聚乙烯醇粉末、VAE乳液、粗甘油 精制甘油、增塑剂、可再分散乳胶粉、食品添加剂、油酸钠、柠檬酸、葡萄糖、污水处理剂、消泡剂、早强剂
- 主营：硅砖、硅砂、硅粉、二氧化硅、优质硅砖、熔融石英砖、零膨胀硅砖、玻璃窑硅砖、碳素炉硅砖
- 主营：硅溶胶、碱性硅溶胶、酸性硅溶胶、二氧化硅、快干型硅溶胶、大粒径硅溶胶、超高纯度硅溶胶、阳离子硅溶胶
- 主营：干燥粉、氧化钙、生石灰粉、二氧化硅和氧化钙、营养补充剂、环氧胶黏剂
- 主营：硅溶胶、液体硅酸钠、液体水玻璃、无色透明泡花碱、水泥添加剂、液体硅酸钾、液体催化剂、粘结剂涂料、透明液体速凝剂
- 主营：玻璃纤维布、玻璃钢树脂、玻璃钢固化剂、二氧化硅、玻璃钢胶衣、玻璃钢色浆、玻璃纤维短切毡、玻璃纤维表面毡、防腐涤纶布、玻璃纤维针织毡、聚酯表面毡、乙烯基树脂、环氧树脂、拉挤树脂、不饱和聚酯树脂、模压树脂、手糊树脂、缠绕树脂、真空导入树脂、玻璃钢脱模油、过氧化甲乙酮、过氧化苯甲酸叔丁酯、异辛酸钴、玻璃纤维纱线、碳纤维表面毡
- 主营：超细硅酸铝粉、硅藻土、膨润土、二氧化硅、高岭土、滑石粉、彩砂、透明粉、白炭黑、金刚砂、石墨、海泡石、木粉、轻钙、重钙、玻璃粉、贝壳粉、凹凸棒土、玻璃鳞片、陶土、铝矾土、火山岩、电气石粉、合成云母、赤铁粉
- 主营：氧化铁颜料、沸石粉、铁砂、电气石粉、氧化铁棕、除渣剂、橡胶粉、氧化铁灰、四氧化三铁、高岭土、玻璃粉、磁粉、氧化铁黑、滑石粉、减水剂、碳酸钙、萤石粉、红色颜料、氧化铁黄、硅微粉、耐火材料、氧化铁红、伊利石粉、氟化钙粉、贝壳粉
- 主营：二氧化硅厂家、低聚果糖
- 主营：定香剂、氧化铅、浮选油、氧化铋、氟化铝、氟化镁、洗涤剂、异丙醇、漂粉精、漂白粉、白僵菌、乙酸钡、氟化钙、水杨酸、松醇油、碳酸钡、醋酸钡、95福美钠、苯丙乳液、三乙二醇、鱼虾养殖、单乙醇胺、三乙醇胺、氯偏乳液、快干水泥
- 主营：火山石、吸附竹炭、重晶石粉、高强无收缩灌浆料、火山石板、萤石、铁粉、石英砂、硅藻土、氧化镁、松树皮、木粉、玻璃块、氧化钙、火山石粉、陶粒、云母
- 主营：消光粉、丙烯酸树脂、蜡粉、气相二氧化硅、炭黑、固化剂
- 主营：甘氨酸、胍基乙酸、牛磺酸、龙华二氧化硅厂家、沙蒿胶、黄原胶、卡拉胶、瓜尔豆胶、半胱氨酸、氨基丁酸、L-精氨酸、食品级亚硫酸氢钠、苯丙氨酸、谷氨酰胺、酪蛋白酸钠、胱氨酸、色氨酸、肌酸、富硒酵母、富铬酵母、氯化胆碱、魔芋粉、可可粉、L-抗坏血酸/vc、亮氨酸、干酪素/酪蛋白
- 主营：海藻酸钠、乳酸链球菌素、卡拉胶、二氧化硅、温轮胶、黄原胶、苯丙氨酸、亮氨酸、苏氨酸、谷氨酸、蛋氨酸、牛磺酸、谷氨酰胺、半胱氨酸、酪蛋白酸钠、柑橘黄、羧甲基纤维素钠、聚丙烯酸钠、柠檬酸、氨基丁酸、胍基乙酸、定优胶、L-硒-甲基硒代半胱、干酪素