Product name: Absolute ether
CAS RN: 60-29-7
Molecular formula: C₂H₅OC₂H₅
Molecular weight: 74.12
Physical properties
Melting point: -116℃
Boiling point: 34.6℃
Flash point: -45℃（CC）
Critical temperature: 92.7℃
Critical pressure: 36.1MPa
Refractive index: 1.3495（25℃）
Solubility: slightly soluble in water, soluble in most organic solvents such as ethanol, benzene, chloroform, and solvent naphtha, etc

Product name: Industrial ether
CAS RN: 60-29-7
Molecular formula: C₂H₅OC₂H₅
Molecular weight: 74.12
Physical properties
Melting point: -116℃
Boiling point: 34.6℃
Flash point: -45℃（CC）
Critical temperature: 92.7℃
Critical pressure: 36.1MPa
Refractive index: 1.3495（25℃）
Solubility: slightly soluble in water, soluble in most organic solvents such as ethanol, benzene, chloroform, and solvent naphtha, etc

Product name: Ether reagent
CAS RN: 60-29-7
Molecular formula: C₂H₅OC₂H₅
Molecular weight: 74.12
Physical properties
Melting point: -116℃
Boiling point: 34.6℃
Flash point: -45℃（CC）
Critical temperature: 92.7℃
Critical pressure: 36.1MPa
Refractive index: 1.3495（25℃）
Solubility: slightly soluble in water, soluble in most organic solvents such as ethanol, benzene, chloroform, and solvent naphtha, etc

Product name: Reagent ether
CAS RN: 60-29-7
Molecular formula: C₂H₅OC₂H₅
Molecular weight: 74.12
Physical properties
Melting point: -116℃
Boiling point: 34.6℃
Flash point: -45℃（CC）
Critical temperature: 92.7℃
Critical pressure: 36.1MPa
Refractive index: 1.3495（25℃）
Solubility: slightly soluble in water, soluble in most organic solvents such as ethanol, benzene, chloroform, and solvent naphtha, etc

Product name: Niobium(V) oxide (monocrystal grade)
AliasNiobium oxide; Niobium oxide (V)
CAS RN: 1313-96-8;12627-00-8
Molecular formula: Nb₂O₅
Molecular weight: 265.8098
Physical and chemical properties
Property: White powder.
Melting point: 1485℃±5℃
Relative density: 4.47
Solubility: insoluble in water, insoluble in acid, soluble in molten potassium hydrogen sulfate or alkali metal carbonate and hydroxide.
Uses: used as raw material for the production of metal niobium, also used in optical glass and electronic industry

Product name: Niobium(V) oxide (optical wave grade)
AliasNiobium oxide; Niobium oxide (V)
CAS RN: 1313-96-8;12627-00-8
Molecular formula: Nb₂O₅
Molecular weight: 265.8098
Physical and chemical properties
Property: White powder.
Melting point: 1485℃±5℃
Relative density: 4.47
Solubility: insoluble in water, insoluble in acid, soluble in molten potassium hydrogen sulfate or alkali metal carbonate and hydroxide.
Uses: used as raw material for the production of metal niobium, also used in optical glass and electronic industry

Product name: Niobium(V) oxide (electronic grade)
AliasNiobium oxide; Niobium oxide (V)
CAS RN: 1313-96-8;12627-00-8
Molecular formula: Nb₂O₅
Molecular weight: 265.8098
Physical and chemical properties
Property: White powder.
Melting point: 1485℃±5℃
Relative density: 4.47
Solubility: insoluble in water, insoluble in acid, soluble in molten potassium hydrogen sulfate or alkali metal carbonate and hydroxide.
Uses: used as raw material for the production of metal niobium, also used in optical glass and electronic industry

Product name: Tantalum pentoxide
Alias: Tantalum pentoxide(V);Tantalum pentoxide
CAS RN: 1314-61-0
Molecular formula: O₅Ta₂
Molecular weight: 441.8928

Properties: Also known as niobic acid, commonly known as earth acid together with tantalic acid. In fact, it is hydrated niobium oxide Nb?O?·xH?O, where the number of hydration depends on the preparation method, the degree of aging and other factors. Niobium hydroxide removes most of the water at 150-200°C, but the remaining water and niobium oxide combine very strongly and must be heated to above 400-450°C to finally remove all the water and turn it into Nb2O5. Niobium hydroxide has amphoteric properties. It is decomposed by Nb(OH)5Nb(OH)4++OH— in acidic medium, and decomposed by Nb(OH)5NbO3—+H++2H2O in alkaline medium. Niobium hydroxide is insoluble in water, insoluble in inorganic acids such as HCl and HNO3, and easily soluble in organic oxyacids such as hydrofluoric acid, oxalic acid, and citric acid. Niobium hydroxide is prepared by hydrolysis, and various niobium compounds can be hydrolyzed to obtain Niobium hydroxide. Niobium hydroxide is the raw material for preparing various niobium compounds.