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![Силикaгель структурированное изображение](/CAS/GIF/7631-86-9.gif)
Силикaгель
- английское имяSilicon dioxide
- CAS №7631-86-9
- CBNumberCB8138262
- ФормулаO2Si
- мольный вес60.08
- EINECS231-545-4
- номер MDLMFCD00148343
- файл Mol7631-86-9.mol
Температура плавления | >1600 °C(lit.) |
Температура кипения | >100 °C(lit.) |
плотность | 2.2-2.6 g/mL at 25 °C |
давление пара | 13.3hPa at 1732℃ |
показатель преломления | 1.46 |
Fp | 2230°C |
температура хранения | 2-8°C |
растворимость | Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides. |
пка | 6.65-9.8[at 20 ℃] |
форма | suspension |
цвет | White to yellow |
Удельный вес | 2.2 |
РН | 5-8 (100g/l, H2O, 20℃)(slurry) |
Запах | at 100.00?%. odorless |
удельное сопротивление | 1∞10*20 (ρ/μΩ.cm) |
Растворимость в воде | insoluble |
Чувствительный | Hygroscopic |
Гидролитическая чувствительность | 6: forms irreversible hydrate |
Кристальная структура | Trigonal |
Мерк | 14,8493 |
Пределы воздействия | NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3 |
Стабильность | Stable. |
Справочник по базе данных CAS | 7631-86-9(CAS DataBase Reference) |
FDA 21 CFR | 172.480; 573.940; 173.340; 176.170; 176.200; 177.1200; 177.2600; 178.3297; 73.1 |
Вещества, добавляемые в пищу (ранее EAFUS) | SILICON DIOXIDE |
FDA UNII | ETJ7Z6XBU4 |
МАИР | 3 (Vol. Sup 7, 68) 1997 |
Справочник по химии NIST | Silicon(iv) oxide(7631-86-9) |
Система регистрации веществ EPA | Silica (7631-86-9) |
Информация о косметике | Silica |
Коды опасности | Xn,Xi | |||||||||
Заявления о рисках | 36/37/38-36/37-22-43-52/53-36/38 | |||||||||
Заявления о безопасности | 26-37/39-36-36/37/39-36/37-61 | |||||||||
OEB | B | |||||||||
OEL | TWA: 6 mg/m3 | |||||||||
кода HS | 2811221000 | |||||||||
Токсичность | LC inhalation in rat: > 200gm/m3/1H | |||||||||
ИДЛА | 3,000 mg/m3 | |||||||||
NFPA 704: |
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рисовальное письмо(GHS)
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рисовальное письмо(GHS)
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сигнальный язык
предупреждение
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вредная бумага
H317:При контакте с кожей может вызывать аллергическую реакцию.
H412:Вредно для водных организмов с долгосрочными последствиями.
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оператор предупредительных мер
P261:Избегать вдыхания пыли/ дыма/ газа/ тумана/ паров/ аэрозолей.
P272:Не уносить загрязненную спецодежду с места работы.
P273:Избегать попадания в окружающую среду.
P280:Использовать перчатки/ средства защиты глаз/ лица.
P302+P352:ПРИ ПОПАДАНИИ НА КОЖУ: Промыть большим количеством воды.
P333+P313:При возникновении раздражения или покраснения кожи обратиться за медицинской помощью.
Силикaгель химические свойства, назначение, производство
Химические свойства
white crystals or powderФизические свойства
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. Silica is insoluble in strong mineral acids and alkalis except HF, concentrated H3PO4, NH4 HF2 , concentrated alkali metal hydroxides. Owing to its 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.Использование
Silicon(IV) oxide, 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. It is also used to manufacture adhesives, sealants and silicones.Определение
ChEBI: A silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.Общее описание
contains sodium stabilizing counterionОпасность
Not toxic if ingested, inhaled silica dust can cause silicosis; carcinogen.Сельскохозяйственное использование
Silica is silicon dioxide, one of the most abundant materials on the earth's crust. Quartz is an example of silica. It is used as a filler in fertilizers, and also, in the manufacture of glass, ceramics, abrasives, rubber and cosmetics.Профиль безопасности
The pure unaltered form is considered a nuisance dust. Some deposits contain small amounts of crystahne quartz and are therefore fibrogenic. When diatomaceous earth is calcined (with or without fluxing agents) some sdica is converted to cristobalite and is therefore fibrogenic. Tridymite has never been detected in calcined batomaceous earth. See also other silica entriesВозможный контакт
Diatomaceous earth is used as a filtering agent and as a filler in construction materials, pesticides, paints, and varnishes. The calcined version (which has been heat treated) is the most dangerous and contains crystallized silica, and should be handled as silica. See also other entries on silicaПеревозки
This material is not singled out by DOT in its Performance-Oriented Packaging Standards.Методы очистки
Purification of silica for high technology applications uses isopiestic vapour distillation from concentrated volatile acids and is absorbed in high purity water. The impurities remain behind. Preliminary cleaning to remove surface contaminants uses dip etching in HF or a mixture of HCl, H2O2 and deionised water [Phelan & Powell Analyst 109 1299 1984].Несовместимости
Silica, amorphous is a noncombustible solid. Generally unreactive chemically. Incompatible with fluorine, oxygen difluoride, chlorine trifluoride. Soluble in molten alkalis and reacts with most metallic oxides at high temperature.Утилизация отходов
Sanitary landfill.Силикaгель запасные части и сырье
Силикaгель поставщик
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