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EC number: 915-037-6 | CAS number: -
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Endpoint summary
Administrative data
Description of key information
There is no data on acute oral, dermal or inhalation toxicity of silicocalcium. Therefore, weight of evidence approach is utilised in which the information on the toxicity of constituents and related compounds are used.
Key value for chemical safety assessment
Acute toxicity: via oral route
Endpoint conclusion
- Dose descriptor:
- LD50
- Value:
- 5 000 mg/kg bw
Acute toxicity: via inhalation route
Endpoint conclusion
- Dose descriptor:
- LC50
- Value:
- 2 000 mg/m³ air
Acute toxicity: via dermal route
Endpoint conclusion
- Dose descriptor:
- LD50
- Value:
- 5 000 mg/kg bw
Additional information
There were no data on acute non-human toxicity via oral route with silicocalcium. Therefore, weight of evidence approach is utilised. This means the use of information on the toxicity of composites (e.g. silicon and calcium) and related compounds - such as calcium silicate, which has similar order of water solubility releasing both silicon and calcium (OECD 2004).
Silicocalcium contains 55-63 wt-% of silicon and 28-32 wt-% of calcium. Other relevant constituents include iron and aluminium, which comprise up to 10 and up to 2.5 wt-% of the silicocalcium, respectively. The surface of silicocalcium is composed mainly of silicon and calcium rich oxides. Silicon is released from CaSi at similar or somewhat lower levels than from amorphous silicon dioxide (pyrogenic silica). The release of iron from silicocalcium is very restricted and resembles the release of iron from pyrogenic silica. Thus, amorphous silica is used for read-across in the assessment of the toxicity of CaSi. However, since significant levels of calcium are also released from CaSi matrix the impact of this element on the acute toxicity of CaSi should be also assessed.
Also small amounts of aluminium are released from silicocalcium matrix in synthetic biological fluids in vitro. In the assessment of the acute toxicity of silicocalcium, the possible impact of aluminium on the toxicity of silicocalcium should be taken into account.
Acute oral toxicity of amorphous silicon dioxide is >2000 mg/kg in rats. Also calcium silicate, which has the same order of water solubility than with CaSi and which release both silicon and calcium has shown low acute oral toxicity (LD50,rats >......)
Calcium (present in ferrosilicocalcium 28-32% w/w) is not acutely toxic as poorly soluble compound (oral LD50>2,000 mg/kg) and even the water soluble calcium chloride has LD50of 1,000 mg/kg.
Aluminium is a minor composing element of silicocalcium, The acute toxicity of metallic aluminium and aluminium compounds has been studied to be low, the reported oral LD50values being in the range of several hundred to 1,000 mg aluminium/kg body weight per day (EHC 1997). Furthermore, the LC50values for inhalation have not been identified for aluminium and its compounds (EHC 1997). Thus, silicocalcium unlikely has acute oral toxic properties.
Inhalation and dermal acute toxicity of silicon is low (do not exceed the classification limits).
Following inhalation exposure of rats to the highest technically feasible concentrations of 140 to ca. 2,000 mg/m3synthetic amorphous silica, no lethal effects were observed. The acute inhalation of synthetic amorphous silica dust may cause discomfort and stress as well as sign of local irritation to nasal, bronchiolar and ocular mucous membranes. Read across from the synthetic amorphous silica dusts suggests that calcium silicon is acutely non-toxic via inhalation.
Justification for classification or non-classification
Conclusion: Silicocalcium is not acutely toxic via oral, inhalation or dermal route.
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