Overview
Spherical silica is a synthetic form of silicon dioxide characterized by its perfectly round particle shape, engineered through advanced processes like flame hydrolysis or sol-gel methods. Unlike irregular silica particles, its spherical morphology ensures superior flowability and packing density, making it ideal for precision applications in electronics and advanced materials. The material is prized for its high chemical purity (>99.9%) and controllable particle sizes (typically 0.1-50μm). Its inert nature and thermal stability further expand its utility in harsh environments, such as semiconductor encapsulation or high-temperature coatings.
Physical and Chemical Properties
Spherical silica exhibits a low coefficient of thermal expansion (CTE), closely matching that of silicon chips, which minimizes stress in electronic packaging. Its spherical shape reduces internal friction, enhancing dispersion in resins and coatings. The surface area ranges from 5-500 m²/g, adjustable for specific needs. Chemically, it is highly stable, resisting acids (except HF) and alkalis. The particles are non-porous, ensuring minimal moisture absorption—critical for moisture-sensitive applications like IC encapsulation. Optical properties include high refractive index (1.46) and UV transparency.
Main Applications
In electronics, spherical silica is a key filler in epoxy molding compounds (EMCs) for semiconductor encapsulation, improving thermal conductivity and reducing CTE mismatch. It also serves as a dielectric material in printed circuit boards (PCBs). Other uses include coatings (enhancing scratch resistance and rheology), adhesives (thixotropy control), and dental composites (aesthetics and strength). In polishing, its uniform particles enable defect-free surfaces for silicon wafers or optical lenses. Emerging applications include battery separators and 3D printing powders.
Safety and Storage
While non-toxic, spherical silica dust can cause mechanical irritation to eyes and respiratory systems. NIOSH-recommended PPE includes N95 masks and goggles. Ensure workplaces comply with OSHA’s permissible exposure limit (PEL) of 6 mg/m³ for respirable crystalline silica. Store in sealed containers away from moisture to prevent clumping. Avoid contact with strong acids (e.g., HF) that dissolve SiO2. Spills should be vacuumed, not swept, to minimize airborne particles.
B2B Procurement Guide
For electronics-grade silica, prioritize suppliers offering ISO 9001-certified production with batch-to-batch consistency. Key specs to request: particle size distribution (D50 ±0.5μm), purity (≥99.99% for semiconductors), and surface treatment (e.g., silane for resin compatibility). Bulk pricing discounts apply for orders >1 ton. Lead times vary; secure contracts with manufacturers in China, Japan, or Germany for stable supply. Sample testing is advised to validate performance in your formulation.
Related Manufacturers
- 主营：二氧化硅粉末、氧化铬绿
- 主营：氧化铁、氧化铝、氧化钛、氧化硅、铜粉、铁粉、镍粉、碳化硅、氧化镍、氧化钼
- 主营：金属硅、金属硅粉、单质硅粉、氧化硅、工业硅、工业硅粉
- 主营：三硫代碳酸钠、红色素-16、聚乙烯亚胺、氧化硅、三乙二醇二异辛酸酯、巯基苯并噻唑钠、L-丙交酯、乙交酯、石油酯-T50、多元醇苯甲酸酯、热压敏染料、光稳定剂、高分子降解材料
- 主营：氧化铝、镍铁粉、钨铁粉、20nm氧化硅、白铅粉、氧化硼、锰铁粉、硅铁粉、二氧化锆、氧化钛粉、球形磁粉、雾化铜粉、钒铁粉末、氧化铋粉、钛铁合金、三氧化钼、氧化镁粉、三氧化二、氧化钴粉、耐火材料、二硫化钨、氧化铬绿、纳米氧化钛、纳米氧化锌、球形磁铁粉、四氧化三铁
- 主营：硅微粉、熔融硅微粉、活性硅微粉、氧化硅、方石英粉、熔融石英粉、结晶硅微粉、煅烧硅微粉、硅橡胶专用硅微粉、超细硅微粉
- 主营：普通石英砂、金刚砂、鹅卵石、氧化硅、重钙粉、云母、玻璃珠
- 主营：硫仪器、高温炉、热量计、氧化硅、破碎机、马弗炉、定硫仪、热值机、测硫仪、量热仪、燃料油、化验机、测定仪、验煤机、大卡仪、化卡机、智能一体、精密自动、微机智能、闭口燃点、微机自动、分析仪器、温程控仪、煤炭大卡、油品热值、智能汉显
- 主营：低硅铁、硅钡孕育剂、硅钙粉、氧化硅、硅钙块、硅钙粒、硅锰合金、硅铝钡、硅铁粒1-3mm、球化剂、硅铁粒3-5mm、硅铝钡钙、冶炼硅锰合金、铸造用硅钡孕育剂、硅铁粒、脱氧剂硅锰块、锰硅合金材料、冶金球化剂、72号硅铁粒、硅锰脱氧合金、硅铝钡钙合金、硅钙合金颗粒、硅钙合金块、高效硅钡孕育剂、低硅合金铁、硅铝钡精炼剂
- 主营：福美钠、漂白粉、次氯酸钠、氧化硅、强氯精、漂粉精、DOP、DBP、蛋白胨
- 主营：氧化硅、福美钠
- 主营：二氧化硅、硅油树脂、中间体、香精香料
- 主营：重晶石粉、膨润土、萤石粉、氧化硅、贝壳彩片、铝矾土粉、孵化蛭石、托玛琳粉、石英砂滤料、精制石英砂、海泡石纤维、造景夜光石、除锈石英砂、超细氧化钙、白色鹅卵石、防沉淀滑石粉、高岭土、夜光石、木粉、莫来砂、麦饭石、沸石、钢结构防火涂料、生物质颗粒、金刚砂、铝矾土
- 主营：优氯净、甘氨酸、磷酸硼、正辛烷、水杨酸、硫酸锰、苯甲醇、平平加、一乙胺、磷酸氢、白僵菌、蛋白胨、碳酸镁、磷酸铝、异丁酸、叔丁醇、硫化钡、木质素、醋酸钡、硫化钙、氯化锌、黄原胶、磺酸钙、氟化镁、异丙醇
- 主营：fto靶材、钐靶材、硼化锆、二氧化硅粉末、硒靶材、铝靶材、钆靶材、铽靶材、氟化镁、钇靶材、钼靶材、铬靶材、镉靶材、钽靶材、硒化锌、氟化镱、砷化镓、硒化锑、碲化镉、镍靶材、钨靶材、铑靶材、铒靶材、铪靶材、锑靶材、碲粉末
- 主营：硒粉、镍粉、硅粉、纳米氧化硅、铜粉、钨粉、二氧化锡、钼粉、锡粉、银粉、碳化钨