Name: silica gel
CAS: 112926-00-8;63231-67-4
Molecular Formula: O2Si
Molecular Weight: 60.0800018310547
silica gel - Names and Identifiers
silica gel - Physico-chemical Properties
| Molecular Formula | O2Si |
| Molar Mass | 60.0800018310547 |
| Density | 2.6 |
| Melting Point | 1610°C |
| Boling Point | 2230℃ |
| Flash Point | 23°C |
| Water Solubility | Insoluble in water |
| Appearance | White crystal particles |
| Specific Gravity | 0.88g/ml |
| Color | blue |
| Odor | Odorless |
| Merck | 14,8493 |
| PH | ~6.8 (10% in aq. suspension) |
| Storage Condition | 2-8°C |
| Sensitive | 6: forms irreversible hydrate |
| Physical and Chemical Properties | Clear or milky white granular solid. With open porous structure, strong adsorption, can absorb a variety of substances. |
silica gel - Risk and Safety
| Risk Codes | R20 - Harmful by inhalation R37 - Irritating to the respiratory system R42/43 - May cause sensitization by inhalation and skin contact. R49 - May cause cancer by inhalation R36/37 - Irritating to eyes and respiratory system. R48/20 - R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R68 - Possible risk of irreversible effects R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R41 - Risk of serious damage to eyes R22 - Harmful if swallowed R60 - May impair fertility |
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37 - Wear suitable protective clothing and gloves. S53 - Avoid exposure - obtain special instructions before use. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S60 - This material and its container must be disposed of as hazardous waste. S39 - Wear eye / face protection. |
| UN IDs | 1993 |
| WGK Germany | 2 |
| RTECS | VV7315000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| Hazard Note | Harmful/Irritant |
silica gel - Reference
| Reference Show more | 1. Zhou Yu, Huang Guozhi, Liang Donghui. Study on Quality Standard of Huoxue Analgesia Powder [J]. Henan Traditional Chinese Medicine, 2016, 36(007):1280-1283. |
silica gel - Nature
is a milky colloidal solution in which ultrafine particles having a diameter of several nanometers to hundreds of nanometers are dispersed in water. It is cured by heating to form silica gel. Non-combustible, non-explosive, non-toxic. The ions on the surface of the colloidal silica particles are hydrated and hydrophilic due to coverage by water molecules. It is not compatible with organic matter, and it is compatible with organic solvents mixed with alcohol, acetone, etc. and water in any proportion. Soluble in hydrofluoric acid and sodium hydroxide solution. Insoluble in other inorganic acids.
Last Update：2025-06-10 22:55:16
silica gel - Preparation Method
sulfuric acid method: the water glass and sulfuric acid were diluted to a certain concentration and then the neutralization reaction was carried out to form a hydrogel. After aging, washing, adding additives for homogenization, spray drying, airflow grinding, the fine silica aerogel was prepared by drying.
Last Update：2022-01-01 11:03:27
silica gel - Application
silica sol is a good inorganic binder. In the precision casting industry, it is used for high temperature baking with high strength, high precision, good finish, small deformation, adhesives for refractory materials and other materials. It is a coating material that prevents oxidation of certain articles. As a coating material (internal and external wall water-based coating) to improve the bonding, fastness, abrasion resistance, stain resistance. As a treatment agent for synthetic fibers to improve the coefficient of friction of the fibers. As a sizing agent for warp yarns in wool spinning industry, it can improve spinnability, hand sensitivity, reduce wool flying and end breaking, and increase yield. Used in the paper industry to improve paper smoothness and paper strength. It is also used for the finishing of electronic materials. Silica sol is mainly produced by ion exchange method. The diluted water glass is filtered to remove impurities, and then subjected to cation exchange, anion exchange, pH adjustment, and evaporation or ultrafiltration to obtain silica sol.
Last Update：2025-08-19 16:24:40
silica gel - Safety
no risk. The use of polyethylene barrels or lined with plastic drum of the iron drum packaging. Net weight per barrel: 25kg, 50kg, 125kg, 250kg. Store in a cool and dry warehouse to prevent sun exposure and high temperature. Stable storage period at 0~40 ℃: from the date of production, the alkaline sodium silica sol is 1 year, and the acidic non-stabilizer silica sol is half a year. During storage, it is strictly prohibited to mix with acid, alkali, toxic substances and other easily corrosive substances. Prevent freezing and sun exposure. Transport can not be less than 5 deg C. Be careful when loading and unloading to prevent packaging breakage. The shelf life is 12 months.
Last Update：2025-06-10 22:55:16
silica gel - Reference Information
| pH indicator color change ph range | About 7.0 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | silicone gel is a kind of low crosslinking density silicone rubber without filler. Silicone gel is different from ordinary silicone rubber elastomers. Its appearance is transparent or translucent gel-like, and its mechanical strength is very low. Its hardness is difficult to measure. Generally, its physical strength is characterized by penetration. In addition to the advantages of general silicone materials such as high and low temperature resistance, safety and non-toxicity, good biocompatibility, and good electrical insulation properties, silicone gel also has the properties of gel-state substances such as vibration absorption, adhesion, and sealing. |
| application | due to the advantages of good buffering performance, colorless and transparent, easy performance adjustment, convenient processing and molding, good fluidity, easy filling fine structure, etc., silicone gel has been widely used in the fields of medical prosthesis, medical dressing, electronic and electrical potting, etc. The application of silicone gel in the field of daily necessities has also developed rapidly, mainly using the non-toxic, non-irritating and buffering and vibration absorption properties of silicone gel. Silicone gel has been used in the market as sole cushion, cushion cushion, underwear cushion and other products. |
| preparation | a preparation method of stable high thermal conductivity silicon gel, comprising the following steps: S1: mixing 95g of divinyl polydimethylsiloxane with a viscosity of 500mPa · s and 0.002g of diethylene tetramethyldisiloxane platinum complex uniformly to obtain glue A; 75g of divinyl polydimethylsiloxane with viscosity of 1000mPa · s, 8.2g of methyl-terminated silicone oil, 3g of hydrogen-containing silicone oil and 0.0003g of ethynyl cyclohexanol were mixed evenly to obtain glue B. S2: 3g of polyamide wax powder, 8g of montmorillonite, 1.0g of propylene glycol alginate, 1.6g of hydroxymethyl cellulose, 221g of thermally conductive powder and 70g of flame retardant prepared in preparation example 1 were mixed and stirred for 20min at a temperature of 25 ℃ and a rotation speed of 700, get the mixture; S3: First, 50g A glue and 25g B glue are mixed and stirred evenly for 1.5h at a temperature of 30 ℃ and a rotation speed of 20r /min, then mixed and stirred evenly with the mixture at a temperature of 30 ℃ and a rotation speed of 20r /min for 1.5h, and then defoamed in a vacuum environment for 5min to obtain silicone gel; Among them, the thermal conductive powder in step S2 includes 527g spherical alumina, 102g boron nitride and 1581g spherical aluminum nitride with a powder diameter of 0.5 m, and the flame retardant in step S2 includes 46g magnesium hydroxide, 18.4g methyl silicone resin and 6.9g polydihydrogen aluminum phosphate salt. |
| Use | Used as gas chromatography reagent, thin layer chromatography reagent and catalyst, also used for gas drying, gas absorption, liquid dehydration, etc. Used for moisture prevention, rust prevention, gas dehydration, purification and catalyst carrier, and can also absorb harmful elements in water used as a humidity indicator, it is used to display the humidity saturation degree of desiccant, the relative humidity of the space medium in the packaging and precision instruments, and the instrument It is suitable for oxygen production, nitrogen production and natural gas dehumidification processes in chemical fertilizers, steel, natural gas and other industries as a dehumidifier. It is also used in military industry, ammunition, etc. It is a good reinforcing agent for rubber, and its reinforcing performance is second only to carbon black, also used for lubricants, insulating materials, etc. Mainly used for moisture absorption and rust prevention of instruments, meters, equipment, etc. under closed conditions. At the same time, it can directly indicate the relative humidity of the environment through the transitional change of its own color from blue to red after absorbing moisture. It can also be used with ordinary desiccant to indicate the moisture absorption degree of desiccant and judge the relative humidity of the environment. model I ultra-pure silica gel: applied to the most commonly used normal phase chromatography filler, widely used in the purification of pharmaceutical intermediates and extraction of natural products. Model II ultra-pure silica gel: applied to sample pretreatment for pesticide residue detection in food and aroma detection in tobacco leaves. Model III ultra-pure silica gel: applied to ROHS-compliant silica gel. Model IV ultrapure -18 filler Silica gel can be used as dehydrating agent and desiccant, catalyst carrier, coating binder, pulp treatment agent, refractory binder, etc. used to process high molecular protein in beer, regeneration of transformer oil and insulating oil, drying of gas and liquid, etc. used as anti-sticking agent for polypropylene and polyethylene film, thick paste coating and unsaturated resin thickening agent, leveling agent for powder coating and furniture paint, anti-caking agent for powder material widely used as thickening agent and matting agent for coating industry, anti-sticking agent for plastic film (polypropylene, polyvinyl chloride, polyethylene) (opening agent), it is the main component of the pre-coating liquid of the blueprint, as well as the anti-caking agent and liquid carrier for food and medicine. |
| production method | sulfuric acid method dilutes water glass and sulfuric acid to a certain concentration respectively and then carries out neutralization reaction to form hydrogel. after aging, washing with water, homogenizing with additives, spray drying, air flow crushing and drying, fine silica aerogel is prepared. the impregnation method will remove the fine pore spherical silica gel or fine pore block silica gel in the moisture absorption chamber with direct steam for silica gel moisture absorption. The indoor temperature is adjusted by a cold air pump to control the temperature of the upper silica gel not to exceed 70 ℃. After 30 hours, check whether the moisture absorption is complete (subject to not frying in water). After the moisture absorption is complete, the material will be stuffed for 8 hours. Then, a dipping device equipped with cobalt chloride and ammonium chloride will be placed. During dipping, the ratio of 1L of dye solution to 1.1kg of dry glue will be carried out. The dipping glue will be poured into one time and stirred quickly. The room temperature will be kept above 15 ℃, dipping for 6~12 hours, and then dehydrated, drying at 90~110 ℃ until the moisture content is less than or equal to 2%, blue glue indicator and color-changing silica gel are obtained by screening. |
Last Update：2024-06-13 11:07:14
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