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BYK-1690 SD is a versatile, solid additive based on hydrocarbons for bound systems.
BYK-1690 SD is VOC-free and silicone-free.
BYK 1690 SD shows consistent and good defoaming effect even at low dosages over a long period of time.
CAS: 7631-86-9
MF: O2Si
MW: 60.08
EINECS: 231-545-4
Synonyms: LICHROSORB SI 100 (10 MYM) 10 G;TLC-SILICA GEL 60 GF254 MEAN PARTICLE SI;LICHROSORB SI 100 (10 MYM) 100 G;SEA SAND EXTRA PURE 5 KG;SILICA GEL 60 GF254 FOR THIN-LAYER CHROM;SILICA GEL 60 PF254 + 366 FOR PREPARATIV;SEA SAND EXTRA PURE 25 KG;SILICA GEL 60 HF254+366 FOR THIN-LAYER C
BYK-1690 SD ensures optimum surface characteristics of the end product.
BYK-1690 SDis highly compatible in various mineral binder systems.
BYK-1690 SD disperses very easily in water.
BYK 1690 SD provides benefits like defoaming without affecting the physical properties.
BYK-1690 SD can be used in applications where long lasting defoaming is required.
BYK-1690 SD occurs almost everywhere on earth.
BYK-1690 SD is one of the most important and abundant oxides on earth, constituting about 60% weight of the earth’s crust as silica itself or in combination with other metal oxides in silicates.
BYK-1690 SD commonly is found as sand in the vast ocean and river shores, their beds, deserts, rocks, and minerals.
BYK-1690 SD exists in several structural forms: polymorphic crystalline silica, synthetic quartz crystals, amorphous silica, and vitreous silica.
This classification is not complete as there are other forms of silica synthesized for specialized applications.
BYK-1690 SD is an inert, naturally occurring mineral used as a carrier in some pesticide products and is sometimes used as an insecticide to control crawling insects, acting via its abrasive and desiccant properties.
BYK-1690 SD is moderately soluble in water and stable in the environment.
BYK-1690 SD is generally considered non-toxic to biodiversity and humans.
However, there are some concerns that exposure to crystalline silica particles that are small enough to reach the lungs can cause lung cancer.
BYK-1690 SD, chemically known as silicon dioxide (SiO2), is a naturally occurring compound that is abundant in the Earth's crust.
BYK-1690 SD is characterized by its hard, crystalline structure and is commonly found in various forms, including quartz, sand, and glass.
BYK-1690 SD is a colorless, odorless, and tasteless solid that is insoluble in water and most organic solvents.
BYK-1690 SD has a high melting point and excellent thermal stability, making it useful in high-temperature applications.
BYK-1690 SD exhibits a range of physical properties, including high hardness and brittleness, and it is a poor conductor of electricity.
In addition to its geological significance, BYK-1690 SD is widely used in various industries, including construction, electronics, and food production, often as a filler, abrasive, or desiccant.
BYK-1690 SD is also an essential component in the manufacture of glass and ceramics.
While generally considered safe, inhalation of fine silica dust can pose health risks, leading to respiratory issues such as silicosis.
BYK-1690 SD, also known as silica, is an oxide of silicon with the chemical formula SiO2, and is commonly found in nature as quartz.
In many parts of the world, silica is the major constituent of sand.
BYK-1690 SD is one of the most complex and abundant families of materials, existing as a compound of several minerals and as a synthetic product.
Examples include fused quartz, fumed silica, opal, and aerogels.
BYK-1690 SD is used in structural materials, microelectronics, and as components in the food and pharmaceutical industries.
All forms are white or colorless, although impure samples can be colored or opaque.
BYK-1690 SD is a common fundamental constituent of glass.
A silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
BYK-1690 SD Chemical Properties
Melting point: >1600 °C(lit.)
Boiling point: >100 °C(lit.)
density: 2.2-2.6 g/mL at 25 °C
bulk density: 200-800kg/m3
vapor pressure: 13.3hPa at 1732℃
refractive index: 1.46
Fp: 2230°C
storage temp.: 2-8°C
solubility: Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
form: suspension
pka: 6.65-9.8[at 20 ℃]
Specific Gravity: 2.2
color: White to yellow
Odor: at 100.00%. odorless
PH: 5-8 (100g/l, H2O, 20℃)(slurry)
Resistivity: 1∞10*20 (ρ/μΩ.cm)
Water Solubility: insoluble
Sensitive: Hygroscopic
Hydrolytic Sensitivity 6: forms irreversible hydrate
Crystal Structure: Trigonal
Merck: 14,8493
Exposure limits NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3
Stability: Stable.
Cosmetics Ingredients Functions: BULKING
ABSORBENT
OPACIFYING
ABRASIVE
VISCOSITY CONTROLLING
ANTICAKING
InChI: 1S/O2Si/c1-3-2
InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYSA-N
CAS DataBase Reference: 7631-86-9(CAS DataBase Reference)
NIST Chemistry Reference: Silicon(iv) oxide(7631-86-9)
IARC: 3 (Vol. Sup 7, 68) 1997
EPA Substance Registry System: BYK-1690 SD (7631-86-9)
ECETOC JACC REPORT: BYK-1690 SD (7631-86-9)
Physical properties
Colorless amorphous (i.e., fused silica) or crystalline (i.e., quartz) material having a low thermal expansion coefficient and excellent optical transmittance in far UV.
BYK-1690 SD is insoluble in strong mineral acids and alkalis except HF, concentrated H3PO4, NH4 HF2 , concentrated alkali metal hydroxides.
Owing to BYK-1690 SD's good corrosion resistance to liquid metals such as Si, Ge, Sn, Pb, Ga, In, Tl, Rb, Bi, and Cd, it is used as crucible container for melting these metals, while silica is readily attacked in an inert atmosphere by molten metals such as Li, Na, K Mg, and Al. Quartz crystals are piezoelectric and pyroelectric.
Maximum service temperature 1090°C.
Uses
BYK-1690 SD is also known as silicone dioxide. Silica has a variety of applications: to control a product’s viscosity, add bulk, and reduce a formulation’s transparency.
BYK-1690 SD can also function as an abrasive.
In addition, BYK-1690 SD can act as a carrier for emollients, and may be used to improve a formulation’s skin feel.
Spherical BYK-1690 SD is porous and highly absorbent, with absorption capabilities roughly 1.5 times its weight.
A typical claim associated with silica is oil control.
BYK-1690 SD is found in sunscreens, scrubs, and wide range of other skin care, makeup, and hair care preparations.
BYK-1690 SD has been successfully used in hypoallergenic and allergy-tested formulations.
Functionalized RAFT agent for controlled radical polymerization; especially suited for the polymerization of styrene; acrylate and acrylamide monomers.
Azide group can be used to conjugate to a variety of alkyne-functionalized biomolecules.
BYK-1690 SD, amorphous is used as carriers, processing aids, anti-caking and free-flow agents in animal feed.
Defoamer applications such as paint, food, paper, textile and other industrial applications.
Synthetic silicon dioxides are used as a rheology control agent in plastics.
BYK-1690 SD is also used to manufacture adhesives, sealants and silicones.
Production Methods
Commercial production of silica typically involves mining quartz-rich materials such as sandstone, quartzite, or vein quartz, followed by crushing and grinding to obtain the desired particle size.
The raw material is then purified through processes like washing, flotation, or acid leaching to remove impurities such as iron, aluminium, and other trace elements.
