Jinsha Precipitated Silica Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of silicone dioxide for food grade silicone rubber in China. With abundant experience, we warmly welcome you to buy high quality products made in China here from our factory. Contact us for more details.
Silica For Food Grade Silicone Rubber
The reinforcement mechanism of silica to silicone rubber is considered to have the following two points:
a. The rubber is adsorbed by the filler particles, and the filler particles adsorb the polymer, so that the rubber molecular segments are directly fixed near the filler particles or are oriented along the filler surface or detained by the filler aggregates.
b. Rubber and filler particles combine, filler particles combine with polymer segments to produce effective crosslinking and polymer entanglement of filler particles.
Based on the above two effects, silica can play a reinforcing role in silicone rubber.
Specification:
Food grade Silica For Silicone Rubber
Specification:
Certificate of Analysis according to EN HG/T3061-2009 | JINSHA PRECIPITATED SILICA MANUFACTURING CO.LTD.SHAXIAN,FUJIAN PROVINCE |
GAOSHA INDUSTRIAL ZONE,SHAXIAN |
Material: | Precipitated Silica | |
Item No.: | JS-160(96) | |
Order Number: | ||
Quantity: | ||
Control Number/Lot No.: |
Product Specification
Producing date: Analysis date:
Test Methods | Properties | Units | Target Values (Spec Limits) | Actual Values | ||
GB25576-2010 | Loss on drying (2Hrs,105℃)加热减量 | % | Max.5.0 | 4.48 | ||
GB25576-2010 | Ignition loss 1000℃ 灼烧减量 | % | Max.7.0 | 3.81 | ||
GB25576-2010 | SiO2 (Dry Basis) 二氧化硅(干基） | % | Min.96 | 98.5 | ||
GB25576-2010 | Content of Pb 铅含量 | mg/kg | Max.5.0 | 0.8 | ||
GB25576-2010 | Content of heavy metal 重金属含量 | mg/kg | Max.30 | ＜30 | ||
GB25576-2010 | Content of As 砷含量 | mg/kg | Max.3.0 | 0.2 | ||
GB25576-2010 | Soluble salt (Na2SO4) 可溶性盐 | % | Max.4.0 | 0.3 | ||
HG/T3067-2008 | pH value (10%aqueous suspension) pH值 | — | 6.0-8.0 | 6.7 | ||
HG/T3072-2008 | DBP absorption value DBP吸收值 | cm3/g | 2.3-2.6 | 2.45 | ||
conclusion结论 | This batch of product is qualified | |||||
Audit 审核 | Analysis 分析人 | |||||
Packaging:20kgs per PP bag,18MT/40HQ unpalletized,14MT/40HQ palletized.
MOQ:1*40HQ
Delivery Time:15days after receipt of your payment.
Q&A:
1.Q:The substances used as surface treatment agents can react with hydroxyl groups on the surface of silica in principle, there are the following.
A:1) Alcohols 2) chlorosilane 3) alkoxysilane 4) hexamethyldisilane 5) silanes.
2.Q:What is the PH value of silica?
Because of the different production methods, the acid and alkali of silica are different. Fumed silica is acidic and precipitated silica is alkaline. The pH value of the most pure fumed silica without HCl is 6, which is due to the dissociation of hydroxyl groups on the surface of silica in water to produce H +. When pH value is lower than 4.6, it is caused by high temperature hydrolysis of retained HCl.
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