Calcium silicate

Calcium silicate Basic information
Product Name:Calcium silicate
Synonyms:SILICIC ACID CALCIUM SALT;VANFRE IL-2;VANSIL W-10;VANSIL(R) W10;VANSIL(R) G;VANSIL W30;VANSIL W-20;CALFLO E
CAS:1344-95-2
MF:CaO3Si
MW:116.16
EINECS:935-756-9
Product Categories:UVCBs-inorganic;Inorganic Salts;Synthetic Reagents
Mol File:1344-95-2.mol
Calcium silicate Structure
Calcium silicate Chemical Properties
Melting point 1540℃ [CRC10]
density 2.9 g/mL at 25 °C (lit.)
solubility Practically insoluble in water; forms a gel with mineral acids. It can absorb up to 2.5 times its weight of liquids and still remain a free-flowing powder.
form white monoclinic crystals
Specific Gravity2.9
Odorat 100.00?%. odorless
PH9.5-11.5 (5% in H2O)
Water Solubility insoluble H2O [HAW93]
Merck 13,1707
Stability:Stable.
LogP0.651 (est)
CAS DataBase Reference1344-95-2(CAS DataBase Reference)
EPA Substance Registry SystemCalcium silicate (1344-95-2)
Safety Information
Hazard Codes Xi
Risk Statements 36/37
Safety Statements 22-26-37/39
WGK Germany 3
RTECS VV9170000
Hazardous Substances Data1344-95-2(Hazardous Substances Data)
MSDS Information
ProviderLanguage
ALFA English
Calcium silicate Usage And Synthesis
DescriptionCalcium Silicate is a hydrous or anhydrous silicate with varying proportions of calcium oxideand silica. many different calcium silicates occur in nature in mineral form (e.g.,wollastonite, afwillite, grammite). The stoichiometry of the hydrate in cement paste is variable and the state of the chemically and physically bound water in its structure is not clear. Thus, calcium silicate can be prepared by calcining the oxide with silica, SiO2, at an elevated temperature: CaO + SiO2+ heat→CaSiO3. Calcium orthosilicate is commonly used as a safe alternative to asbestos for high-temperature insulation materials. Industrial grade piping and equipment insulation are often fabricated from calcium orthosilicate.
Chemical PropertiesCalcium silicate occurs as a crystalline or amorphous white or off white material, and often exists in different hydrate forms. It consists of different ratios of CaO and SiO4, including tricalcium silicate (3CaO.SiO2) and dicalcium silicate Ca2SiO4. It is insoluble in water and forms a gel with inorganic acids. The pH of 5% suspension is 8.4~10.2.
UsesCalcium Silicate is an anticaking agent that exists in different forms, which are insoluble in water. it is used in salt to enhance flowability under extremely high humidity conditions. it is also used in baking powder and fabricated chips to absorb water or other liquids.
Production MethodsCalcium silicate is made in various ways by reacting siliceous material (such as diatomaceous earth) and calcium compounds (such as calcium hydroxide (Ca (OH) 2).The refinement of wollastonite ore into high-grade wollastonite was originally done by manual selection at many mines. This process is now performed by screening and magnetic separators, sometimes in combination with flotation and vacuum filtration. Grinding and milling operations can produce variable mesh powders or aggregates.
ApplicationThe main applications of calcium silicate relate to its anticaking properties, and it has therefore been used in dusting powders and a range of different cosmetic products (e.g. face powders, eye shadow). It is also used as anticaking agent in table salt, foods, pharmaceuticals, and agricultural pesticides; replacement for asbestos in thermal insulation; Constituent (produced in situ) of lime glass, portland cement; reinforcing filler in elastomers and plastics; absorbent for liquids, gases, vapors; as anti-caking agent, suspension agent, pigment and pigment extender; binder for refractory material; in chromatography; in road construction.
PreparationCalcium silicate is a naturally occurring mineral, but for commercial applications it is usually prepared from lime and diatomaceous earth under carefully controlled conditions.
HazardIrritating dust. Use in foods restricted to 5% in baking powder, 2% in table salt. Upper res- piratory tract irritant. Questionable carcinogen.
Health HazardThe toxicity of calcium silicate depends on particle size, aspect ratio, and amount of silica and respirable fiber.1 Synthetic nonfibrous calcium silicate is considered to be a nuisance dust.
Skin irritation was reported in a worker exposed to an atmosphere permeated with calcium silicate.1 A study of 104 wallastonite (a naturally occurring calcium silicate mineral) miners showed no relationship between the prevalence of chronic bronchitis or airflow obstruction with increasing exposure.1 In a cohort mortality study of wollastonite quarry workers the observed numbers of deaths from all cancers combined and lung cancer were lower than expected.
Flammability and ExplosibilityNotclassified
Pharmaceutical ApplicationsCalcium silicate (Ca2SiO4) is used in the pharmaceutical industry as an anticaking agent. Anti-caking agents absorb moisture and allow products to flow freely during the manufacturing process. It is also used as a filler aid for oral pharmaceuticals. It has also been used in pharmaceutical preparations as an antacid.
Industrial usesCalcium silicate compounds belong to a complicated class of silicates. Among their many industrial applications, calcium silicates are heavily used as a building material as they constitute the main ingredient in today’s cement clinker.
Safety ProfileA nuisance dust
SafetyGRAS listed. Included in the FDA Inactive Ingredients Database (oral dosage forms). Included in nonparenteral (oral, orodispersible, effervescent and enteric-coated tablets) formulations licensed in the UK.
calcium silicate is generally recognized as safe (GRAS) when used at levels not exceed 2% in table salt and 5% in baking powder.
storageCalcium silicate is chemically stable and nonflammable, but it should be protected from moisture. Store in airtight containers in a cool, dry place.
IncompatibilitiesNone reported [Note: After prolonged contact with water, solution reverts to soluble calcium salts & amorphous silica.]
Regulatory StatusCalcium silicate (E552) is listed in Commission Regulation (EU) No 231/2012 as an authorised food additive and categorized as “additives other than colours and sweeteners”. It is an approved ingredient in Australia and New Zealand with the code number 552.
Calcium silicate Preparation Products And Raw materials
Raw materialsCalcium oxide
CERIUM(III) CHLORIDE Silicic acid (H2SiO3), calcium salt (1:1) Calcium silicate thermal insulation products calcium silicate clays Calcium fluorosilicate dihydrate Calcium borate silicate Calcium silicate,active aluminium calcium silicate,ALUMINUM CALCIUM SILICATE aluminium calcium silicate(2:1:2) calcium silicate [ca3sio5] Calcium Silicate, ortho, -325 Mesh,Calcium silicate, ortho, 99% (metals basis) CALCIUM SILICATE HYDRATE Calcium metasilicate Silicic acid, calcium salt calcium [orthosilicato(4-)]dioxodialuminate(2-) Magnesium silicate Calcium hexafluorosilicate Silicic acid, calcium magnesium salt

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