Substance description/characteristics
The substance zinc oxide is a mono constituent substance (origin: inorganic)
The following public name is used: zinc oxide
| EC number: | 215-222-5 |
| EC name: | zinc oxide |
| CAS number (EC inventory): | 1314-13-2 |
| IUPAC name: | oxozinc |
| Annex I index number: | 030-013-00-7 |
| Molecular formula: | OZn |
| Molecular weight range: | 81.4084 |
Description: typical grade with low level impurities, hexagonal crystalline structure
Degree of purity: > 97.0 — < 100.0 % (w/w)
| Constituent | Typical concentration | Concentration range | Remarks |
|
zinc oxide |
ca. 99.8 % (w/w) | > 97.0 — < 100.0 % (w/w) | hexagonale crystalline structure |
| Impurities | Typical concentration | Concentration range | Remarks |
|
Carbonic acid, zinc salt, basic |
< 0.1 % (w/w) | >= 0.0 — < 3.0 % (w/w) |
Description: some impurities may trigger classification
Degree of purity: > 90.0 — < 99.7 % (w/w)
| Constituent | Typical concentration | Concentration range | Remarks |
|
zinc oxide |
ca. 95.0 % (w/w) | > 89.5 — < 99.7 % (w/w) | hexagonal crystalline structure |
| Impurities | Typical concentration | Concentration range | Remarks |
|
lead monoxide EC no.: 215-267-0 |
>= 0.3 % (w/w) | >= 0.3 — < 7.0% (w/w) | Impurity is relevant for C&L of the substance. |
|
Carbonic acid,zinc salt,basic |
< 0.1 % (w/w) | >= 0.0 — < 3.0 % (w/w) |
Description: Set of zinc oxide nanoforms in nano dimension with hexagonal crystalline structure (not manufactured by Lead Registrant), with and without hydrophilic surface treatment (e.g. hydrated silica, aminosilanes).
Degree of purity: c.a 100% (w/w)
| Constituent | Typical concentration | Concentration range | Remarks |
|---|---|---|---|
| Zinc oxide EC no: 215-222-5 | c.a 100% (w/w) | > 99.5% - < 100% (w/w) |
D. Zinc oxide nano - hydrophobic surface treatment
Description: Set of zinc oxide nanoforms in nano dimension with hexagonal crystalline structure (not manufactured by Lead Registrant), treated with hydrophobic surface treatment (e.g. triethoxycaprylylsilane, dimethoxydiphenylsilanetriethoxycaprylylsilane cross-polymer, octyl triethoxy silane).
Degree of purity: >=96.0 — <= 100.0% (w/w)
Constituents
| Constituent | Typical concentration | Concentration range | Remarks |
| zinc oxide EC no: 215-222-5 | >= 96.0% (w/w) | >= 96.0 — <100.0% (w/w) | hexagonal crystalline structure |
Boundaries of the characteristics for each set of nanoforms:
| Name of set | Zinc oxide nano with and without hydrophilic surface treatment | Zinc oxide nano - hydrophobic surface treatment |
| Shape | spheroidal | |
| Particle size distribution and range |
boundary composition: 4,7 – 175,7 nm. d10, d50 and d90 values of the smallest and largest nanoforms: smallest values: 4,7 ; 8,9 ; 16,1 nm respectively. largest values: 38,0 ; 96,6 ; 175,7 nm respectively. |
boundary composition: 5,8 – 117,4 nm d10, d50 and d90 values of the smallest and largest nanoforms: - smallest values: 5,8 ; 12,9 ; 27 nm respectively. - largest values: 34,2 ; 70,8 ; 117,4 nm respectively. |
|
Specific surface area |
>=10 <=100 m²/g | >=10 <=51 m²/g |
|
Surface functionalisation/treatment |
Nanoforms with and without a hydrophilic coating | Nanoforms with a hydrophobic coating |
| Crystallinity | wurtzite structure | |
Please download classification information from document at the bottom of the page. Zinc oxide was in annex I of the old DSD 67/538/EC legislation and has been taken over in the annex VI of CLP 1272/2008/EC. Classification for environment has been revised according to the new criteria of 2nd ATP of CLP. An additional entry for zinc oxide nano was added.