Registration Dossier
Registration Dossier
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EC number: 231-545-4 | CAS number: 7631-86-9
Substance identity
Identification
- Display Name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Type of Substance
- Composition:
- mono-constituent substance
- Origin:
- inorganic
Substance Identifiers open all close all
I0250
(No other type specified)
The silica substance that we are registering is pyrogenic
(No other type specified)
Compositions
Boundary Composition(s) open all close all
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Snythetic amorphous silicon dioxide, nanostructured material_Set1
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material, silanized_Set 2
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- In general, Silanized SAS contains no detectable amounts of crystalline silica. X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- yes
- Does the set contain both treated and non-surface treated nanoforms?:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- synthetic amorphous silica, nanostructured material
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- synthetic amorphous silicon dioxide, nanostructured material, silanized
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- In general, SAS contains no detectable amounts of crystalline silica. X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- yes
- Does the set contain both treated and non-surface treated nanoforms?:
- no
Surface treatments
- Surface treatment name:
- SAS Silanized
Surface treatment
- Order:
- #1
- External layer:
- hydrophobic
- Description:
- The surface treatment agents are alkoxy- or chlorosilanes, silazanes, and/or siloxanes and have been generally registered under REACH as relevant. The use as surface treatment agents is described in the REACH dossiers and exposure scenarios of specific alkoxysilanes, chlorosilanes, silazanes and/or siloxanes. The carbon content at the surface of SAS Silanized is less than 20 wt.-% typically less than 10 wt-%.
- Percentage of coverage of particle surface, %:
- >= 30 - < 100
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic Amorphous Silica, set of nanoforms (Boundary composition provided by Lead Registrant in co-ordination with SAS REACH Consortium)
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material_Set1
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material, silanized_Set 2
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- In general, Silanized SAS contains no detectable amounts of crystalline silica. X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- yes
- Does the set contain both treated and non-surface treated nanoforms?:
- no
Surface treatments
- Surface treatment name:
- Silanized SAS
Surface treatment
- Order:
- #1
- External layer:
- hydrophobic
- Description:
- The surface treatment agents are alkoxy- or chlorosilanes, silazanes, and/or siloxanes and have been generally registered under REACH as relevant. The use as surface treatment agents is described in the REACH dossiers and exposure scenarios of specific alkoxysilanes, chlorosilanes, silazanes and/or siloxanes. The carbon content at the surface of SAS Silanized is less than 20 wt.-% typically less than 10 wt-%.
- Percentage of coverage of particle surface, %:
- > 0 - < 50
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- synthetic amorphous silicon dioxide (SAS), nanomaterial, silanized
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Fraction of constituent particles in the size range 1-100 nm:
- 100 - 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Pure structure:
- yes
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
Surface functionalisation / treatment
- Surface treatment applied:
- yes
- Does the set contain both treated and non-surface treated nanoforms?:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- synthetic amorphous silicon dioxide (SAS), nanomaterial
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- > 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Fraction of constituent particles in the size range 1-100 nm:
- 100 - 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Pure structure:
- yes
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material_Set1
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal struc ture.
- Fraction of constituent particles in the size range 1-100 nm:
- >= 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- >= 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material, silanized_Set 2
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal struc ture.
- Fraction of constituent particles in the size range 1-100 nm:
- >= 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- >= 99.7 - <= 100 %
- Description:
- In general, Silanized SAS contains no detectable amounts of crystalline silica. X-ray diffraction di agrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit f or crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- yes
- Does the set contain both treated and non-surface treated nanoforms?:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Colloidal silica suspension
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material_Set 1
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Name:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- no
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Characterisation of nanoforms
- Type of information reported:
- set of nanoforms
- Name of set of nanoforms:
- Synthetic amorphous silicon dioxide, nanostructured material, silanized_Set 2
Cross-reference
- Reason / purpose:
- justification for reporting set of similar nanoforms
Shape
Shape description
- Shape category:
- spheroidal
- Shape:
- other: 3-dimensional branched fractal aggregates
- Pure shape:
- yes
- Range:
- >= 99 - <= 100 %
Particle size distribution and range
Particle size distribution and range
- Shape category:
- spheroidal
Percentileopen allclose all
- Percentile:
- D10
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D50
- Range:
- >= 1 - <= 100 nm
- Percentile:
- D90
- Range:
- >= 1 - <= 100 nm
- Additional information:
- The particle forming mechanism for each manufacturing process starts with the formation of liquid nuclei that grow to constituent particles that coagulate to aggregates and solidify. Constituent particles are therefore spherical in nature while aggregates (and agglomerates) show a high fractal structure.
- Fraction of constituent particles in the size range 1-100 nm:
- > 50 - <= 100 %
Crystallinity
Structures
- Structure:
- amorphous
- Pure structure:
- yes
- Range:
- > 99.7 - <= 100 %
- Description:
- In general, Silanized SAS contains no detectable amounts of crystalline silica. X-ray diffraction diagrams of SAS, show only a broad halo, revealing an X-ray amorphous structure. The detection limit for crystallinity by X-ray is in the maximum order of 0.3% by weight or below.
Specific surface area
- Range of specific surface area:
- >= 4 - <= 1 000 m²/g
- Range of volume specific surface area:
- >= 8.8 - <= 2 200 m²/cm³
- Skeletal density:
- >= 1.7 - <= 2.25 g/cm³
Surface functionalisation / treatment
- Surface treatment applied:
- yes
- Does the set contain both treated and non-surface treated nanoforms?:
- no
Surface treatments
- Surface treatment name:
- Silanized SAS
Surface treatment
- Order:
- #1
- External layer:
- hydrophobic
- Description:
- The surface treatment agents are alkoxy- or chlorosilanes, silazanes, and/or siloxanes and have been generally registered under REACH as relevant. The use as surface treatment agents is described in the REACH dossiers and exposure scenarios of specific alkoxysilanes, chlorosilanes, silazanes and/or siloxanes. The carbon content at the surface of SAS Silanized is less than 20 wt.-% typically less than 10 wt-%.
- Percentage of coverage of particle surface, %:
- > 0 - < 50
- State Form:
- solid: nanoform
Constituent 1
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- CAS Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane