Overview
Wacker H18 Nanosilica is a high-performance fumed silica produced by Wacker Chemie AG, a leading German chemical manufacturer. This hydrophobic variant undergoes surface treatment to enhance compatibility with non-polar systems, making it ideal for silicone-based applications. Its primary function is to improve mechanical properties like tensile strength and tear resistance in elastomers while acting as a rheology modifier in liquids. The product is manufactured through flame hydrolysis of silicon tetrachloride, resulting in ultra-fine particles with a chain-like aggregate structure. As a nano-material, it provides exceptional reinforcement at low loading levels, typically between 5–15% in formulations. Industrial users value its predictable performance and batch-to-batch consistency.
Physical and Chemical Properties
With a BET surface area of 180±20 m²/g, Wacker H18 offers substantial interface activity that contributes to its thickening and reinforcing effects. The hydrophobic surface modification—typically with dimethyldichlorosilane—reduces moisture absorption to below 1% (at 50% RH), preventing clumping and ensuring free-flowing powder characteristics. Particle size distribution ranges between 7–40 nm in primary diameter, forming aggregates of 100–300 nm. The material exhibits pH neutrality (5.0–7.5 in 4% aqueous dispersion) and low ionic impurity content (<500 ppm chloride). Its thermal stability exceeds 600°C, making it suitable for high-temperature processing in silicone rubber vulcanization.
Main Applications
In silicone rubber formulations, H18 nanosilica significantly enhances mechanical properties, enabling production of high-performance gaskets, seals, and medical devices. It increases Shore hardness without compromising elasticity and improves compression set resistance by up to 30% compared to unfilled silicones. The product serves as an anti-settling agent in adhesives and sealants, maintaining uniform filler distribution during storage. Coatings manufacturers utilize it for sag control in vertical applications and to impart scratch resistance. Specialty applications include use in defoamer concentrates, where it stabilizes oil droplets, and in thermally conductive silicone pads for electronics cooling systems.
Safety and Storage
As a fine powder, Wacker H18 requires careful handling to prevent dust generation. NIOSH-approved dust masks (N95 or equivalent) are recommended during bulk transfer operations. The material is classified as a nuisance dust with a TLV of 2 mg/m³ for respirable particles under OSHA guidelines. Storage should maintain relative humidity below 65% to preserve hydrophobicity. Original packaging—typically multi-layer kraft paper bags with polyethylene liners—provides 12-month stability when unopened. Opened containers should be resealed with nitrogen purging if long-term storage is needed. Spills should be cleaned with vacuum systems rather than brooms to avoid airborne dispersion.
B2B Procurement Guide
Industrial buyers should specify the H18 designation clearly, as Wacker produces multiple silica grades with differing surface treatments. Key procurement considerations include verifying certificates of analysis for surface area, loss on drying (max 1.5%), and sieve residue (typically <0.05% on 45μm sieve). Bulk purchases (palletized 10–20 kg bags) typically offer 10–15% cost savings versus small-quantity orders. Just-in-time delivery is preferable to prolonged warehouse storage. Alternative supply options include HDK® H18 from Wacker’s competitors, though formulation revalidation may be necessary due to differences in surface chemistry and aggregate structure.
Related Manufacturers
- 主营：白炭黑、消光粉、热塑性弹性体、二氧化硅、空心玻璃微球、发泡微球、酚醛树脂、石油树脂、光稳定剂、抗氧剂、分散剂、木质素、PETS、色浆、聚乙烯醇、CMC、SBR乳液、丁苯橡胶、增韧剂、抗冲改性剂、改性硅烷聚醚、羊巴粉、绒毛粉、炭黑、硅微粉
- 主营：环氧树脂、固化剂、阻燃剂、二氧化硅、助剂、丁腈橡胶、稀释剂、促进剂、交联剂、分散剂、消泡剂、炭黑、聚硫醇、双氰胺、增韧剂、消光粉、抗氧化剂
- 主营：[]
- 主营：涂料助剂、颜料、树脂、固化剂、增塑剂、紫外线吸收剂
- 主营：消光粉、聚合物、木质素、二氧化硅、白炭黑、丁苯橡胶、合成橡胶、光稳定剂、酚醛树脂、石油树脂、色浆、弹性体、绒毛粉、cmc、紫外线吸收剂、熔喷布、改性硅烷聚醚、炭黑、空心微珠、玻璃粉、聚乙烯醇、塑料微球
- 主营：硅微粉、熔融硅微粉、活性硅微粉、纳米硅微粉、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：硅溶胶、碱性硅溶胶、酸性硅溶胶、二氧化硅溶液、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：硅溶胶、液体硅酸钠、液体水玻璃、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、无色透明泡花碱
- 主营：硫酸铜、凡士林、碘化钾、硫酸铵、二甲苯、钼酸铵、正庚烷、正丁醇、水杨酸、石油醚、乙二醇、硅酸钠、环己烷、异辛烷、苯甲酸、草酸铵、环己酮、硫酸镁、蓖麻油、正己烷、活性炭、溶剂油、草酸钠、二氯甲烷、乙酸乙酯
- 主营：润滑剂、石墨粉、超细石墨粉、纳米二氧化硅、阻燃石墨、超细石墨、高纯石墨、煅烧高岭土、耐火泥造纸、润滑石墨铅粉、合成氟金云母粉、高岭土、种子包衣粉、麦饭石粉、白色电气石粉、远红外粉、导电石墨粉、耐高温石墨粉、云母片、天然云母片、耐高温云母片、透明云母片、云母板、沸石、沸石粉、麦饭石颗粒
- 主营：二氧化硅、乳化剂、分散剂、防水防油剂
- 主营：乳化剂、消泡剂、分散剂、二氧化硅、润湿剂、增稠剂、树脂、抗氧剂、杀菌防腐防霉剂、uv单体
- 主营：地板漆、流平剂、消泡剂、二氧化硅、纳米级防沉剂、乳化剂、增稠剂、固化剂、白炭黑、固化树脂、聚酯树脂、水性颜料、抗静电剂、涂料助剂、聚乙烯蜡、建筑涂料、丙烯酸树脂、水性润湿剂、润湿分散剂、丙烯酸乳液、特种分散剂、表面活性剂、经典润湿剂、聚氨酯树脂、纺织印染助剂
- 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：脱氧剂、催化剂、分子筛、介孔二氧化硅、干燥剂、吸附剂、钯触媒、voc吸附、活化粉、沸石吸附、zsm-5分子筛、脱硫脱氨分子筛、贵金属催化剂、钯催化剂、酸性气体干燥、beta分子筛、钛硅催化剂、异构化催化剂、加氢催化剂、溶剂干燥分子筛、sapo-34、ssz-13、NaY
- 主营：高岭土、铝矾土、高铝粉、二氧化硅、炉衬料、石英砂、石英粉、长石粉、高铝砂、玻璃粉、电熔镁砂、锆英砂、金刚砂、矿渣粉、重晶石粉、彩砂、重金石、钙粉
- 主营：卡博特二氧化硅、防螨助剂、树脂油墨稀释剂
- 主营：防腐剂、甲酸钙、消泡剂、涂料乳液、多功能助剂、工业级卡松、二甲基酮肟、工业硫酸铜、原料水杨酸钠、水性涂料助剂、工业级粘合剂、建筑水泥早强剂、工业级三乙醇胺、柠檬酸、苹果酸、硫醇甲基锡(有机锡)、松香、松香甘油酯、苯甲酸钠、苯甲酸、酒石酸
- 主营：氧化铁颜料、铁粉、膨润土、二氧化硅、珍珠岩、矿物纤维、木质纤维、硅酸铝纤维、海泡石纤维、云母粉
- 主营：阻燃剂、氧化镁、氧化锌、高纯纳米、纳米碳酸钙、纳米氧化铝、纳米氧化锆、纳米二氧化硅、碳酸镁、氢氧化铝、涂料阻燃、橡胶陶瓷、白色粉末、金属粉末、重质高纯、专用葡萄糖、高纯氧化铌、专用硫酸镁、水硫酸亚铁、钛酸锶粉末、五氧化二铌、碳酸锶粉末、七水硫酸镁、催化剂载体、高纯度葡萄糖