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EC number: 237-511-5 | CAS number: 13822-56-5
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Endpoint summary
Administrative data
Description of key information
In the key skin irritation study (WIL, 2003), 3-(trimethoxysilyl)propylamine was found to be a skin irritant since effects were not fully reversed at the end of the observation period.
The key study for eye irritation was read across from the structurally analogous 3-aminopropyltriethoxysilane (CAS 919-30-2). The test substance is found highly irritating to the eye, and the result is further supported by weight of evidence from other amine containing alkoxysilanes (PFA, 2015t).
Key value for chemical safety assessment
Skin irritation / corrosion
Link to relevant study records
- Endpoint:
- skin irritation: in vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- from 20 Jan 2003 to 3 Feb 2003
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Remarks:
- This study was conducted largely according to the appropriate OECD test guideline and in compliance with GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
- Deviations:
- yes
- Remarks:
- observations only to 7 days, when effects still evident
- GLP compliance:
- yes
- Species:
- rabbit
- Strain:
- New Zealand White
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Covance Research Products Inc., Denver, PA, USA
- Age at study initiation: "young adult"
- Weight at study initiation: 3.018-3.171 kg
- Housing: 1/suspended wire mesh cage
- Diet: standard diet ad libitum
- Water: drinking water ad libitum
- Acclimation period: at least 7 days
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18.5-19
- Humidity (%): 43.6-48.0. (The summary indicates the maximum humidity was 49.3%, the data provided do not appear to support this.)
- Photoperiod (hrs dark / hrs light): 12 h/12 h
IN-LIFE DATES: From: 2003-01-20 To: 2003-02-03 (14 days - although observational data are only given for 7 days) - Type of coverage:
- semiocclusive
- Preparation of test site:
- shaved
- Vehicle:
- unchanged (no vehicle)
- Controls:
- not required
- Amount / concentration applied:
- TEST MATERIAL
- Amount(s) applied: 0.5 ml
- Concentration: neat - Duration of treatment / exposure:
- 3 min
1 h
4 h - Observation period:
- 3-min: immediately and 1 (or 24) h
1-h: immediately and 24, 48, 73 h, and days 4 and 7
4-h: 1, 24, 48, 73 h, and days 4 and 7 - Number of animals:
- 1 rabbit: 3-min, 1 h, 4 h
2 further rabbits: 4 h - Details on study design:
- TEST SITE
- Area of exposure: 2.5 cm x 2.5 cm
- % coverage: not stated
- Type of wrap if used: 2-ply gauze secured with Micropore tape, overwrapped with gauze binder secured with Dermiform tape.
REMOVAL OF TEST SUBSTANCE
- Washing: yes
- Time after start of exposure: 3 min, 1 h, 4 h
SCORING SYSTEM: Draize, 1965. Mean of 1, 24, 48, 72 h - Irritation parameter:
- primary dermal irritation index (PDII)
- Basis:
- mean
- Remarks:
- of 3 animals
- Time point:
- other: 1, 24, 48, 72 h mean
- Score:
- 1.8
- Max. score:
- 8
- Reversibility:
- other: effects evident at 7 days, no data given after 7 days
- Irritation parameter:
- erythema score
- Basis:
- animal #1
- Time point:
- 24/48/72 h
- Score:
- 1.33
- Max. score:
- 4
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- erythema score
- Basis:
- animal #2
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 4
- Reversibility:
- not fully reversible within: 7 days, no data given after 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- erythema score
- Basis:
- animal #3
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 4
- Reversibility:
- not fully reversible within: 7 days, no data given after 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- edema score
- Basis:
- animal #1
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 4
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- no indication of irritation
- Irritation parameter:
- edema score
- Basis:
- animal #2
- Time point:
- 24/48/72 h
- Score:
- 1.33
- Max. score:
- 4
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- no indication of irritation
- Irritation parameter:
- edema score
- Basis:
- animal #3
- Time point:
- 24/48/72 h
- Score:
- 0.67
- Max. score:
- 4
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- no indication of irritation
- Irritant / corrosive response data:
- 4-Hour exposure caused erythema and oedema (grade 1 or 2) in up to three animals; erythema persisted to the final observation at 7 days. See tables 1-3.
- Interpretation of results:
- Category 2 (irritant) based on GHS criteria
- Remarks:
- Criteria used for interpretation of results: EU
- Conclusions:
- A reliable study conducted broadly in accordance with OECD 404 and GLP, found the test material to be slightly irritating to the skin of rabbits. According to EU criteria, classification as a skin irritant is required since the observed effects were not reversed at the end of the study.
Reference
Table 1: Irritant/corrosive response data for each animal after exposure for 3 minutes, at each observation time up to removal of each animal from the test
Score at time point / Reversibility |
Erythema |
Edema |
Max. score: 4 |
Max. score: 4 |
|
Immediately after exposure |
0 |
0 |
1 h* |
0 |
0 |
Reversibility* |
n/a |
n/a |
* the text describes a second observation at 1 h, the tabulated data describes the second observation at 24 h.
** Reversibility: c. = completely reversible; n.c. = not completely reversible; n. = not reversible
Table 2: Irritant/corrosive response data for each animal after exposure for 1 hour, at each observation time up to removal of each animal from the test
Score at time point / Reversibility |
Erythema |
Edema |
Max. score: 4 |
Max. score: 4 |
|
Immediately after exposure |
0 |
0 |
24 h |
1 |
0 |
48 h |
1 |
0 |
72 h |
2a |
1 |
4 days |
1 |
1 |
7 days |
0b |
0 |
Reversibility* |
c |
n/a |
Average time (unit) for reversion |
7 days |
|
* Reversibility: c. = completely reversible; n.c. = not completely reversible; n. = not reversible
a erythema spreading outside dosed site to
b = desquamation
Table 3: Irritant/corrosive response data for each animal after exposure for 4 hour, at each observation time up to removal of each animal from the test
Score at time point / Reversibility |
Erythema |
Edema |
Max. score: 4 |
Max. score: 4 |
|
60 min |
0/1/0 |
0/0/0 |
24 h |
1/2/1 |
0/2/1 |
48 h |
1/2/1 |
0/1/0 |
72 h |
2a/2/1 |
1/1/1 |
4 days |
2/1b/1 |
1/1/1 |
7 days |
0b/1b/1b |
0/0/0 |
Average 24 h, 48 h, 72 h (EU criteria) |
1.3/2/1 |
0.3/1.3/0.7 |
Average 1 h, 24 h, 48 h, 72 h (as given in report); PII=1.8 |
1.2 |
0.6 |
Reversibility* |
unclear |
c |
Average time (unit) for reversion |
No data at 14 days |
Day 7 |
* Reversibility: c. = completely reversible; n.c. = not completely reversible; n. = not reversible
a erythema spreading outside dosed site to
b = desquamation
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irritating)
Eye irritation
Link to relevant study records
- Endpoint:
- eye irritation: in vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 405 (Acute Eye Irritation / Corrosion)
- GLP compliance:
- not specified
- Remarks:
- SIAR (2003) notes that this laboratory was GLP certified at the date of this study
- Species:
- rabbit
- Strain:
- New Zealand White
- Details on test animals or tissues and environmental conditions:
- TEST ANIMALS
- Source: no details given
- Age at study initiation: : no details given
- Weight at study initiation: no details given
- Housing: no details given
- Diet: standard diet ad libitum
- Water : drinking water ad libitum
- Acclimation period: no details
ENVIRONMENTAL CONDITIONS
no details given
IN-LIFE DATES: no details given - Vehicle:
- unchanged (no vehicle)
- Controls:
- other: the untreated eye usually serves as the control
- Amount / concentration applied:
- undiluted
Amount applied: 0.1 ml, 0.005 ml - Duration of treatment / exposure:
- Eyes unwashed.
- Observation period (in vivo):
- Observation to 21 days in some cases
- Number of animals or in vitro replicates:
- 6 (3/sex)
- Details on study design:
- REMOVAL OF TEST SUBSTANCE
- Washing: unwashed
SCORING SYSTEM: after Draize, 1959
TOOL USED TO ASSESS SCORE: fluorescein (for 1-day reading) - Irritation parameter:
- cornea opacity score
- Basis:
- animal #1
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2.33
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 4 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- cornea opacity score
- Basis:
- animal #2
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 4
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 4 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- cornea opacity score
- Basis:
- animal #3
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 3
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 4 at 7.0 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- cornea opacity score
- Basis:
- animal #4
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 4 at 7.0 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- cornea opacity score
- Basis:
- animal #5
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 3.33
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 4 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- cornea opacity score
- Basis:
- animal #6
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 2 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- conjunctivae score
- Basis:
- animal #1
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 3
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- conjunctivae score
- Basis:
- animal #2
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2.33
- Max. score:
- 3
- Reversibility:
- not reversible
- Remarks:
- Score of 2 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- conjunctivae score
- Basis:
- animal #3
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 3
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- conjunctivae score
- Basis:
- animal #4
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2.33
- Max. score:
- 3
- Reversibility:
- not reversible
- Remarks:
- Score of 2 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- conjunctivae score
- Basis:
- animal #5
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2.66
- Max. score:
- 3
- Reversibility:
- not reversible
- Remarks:
- Score of 2 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- conjunctivae score
- Basis:
- animal #6
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2.33
- Max. score:
- 3
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- chemosis score
- Basis:
- animal #1
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- chemosis score
- Basis:
- animal #2
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1.66
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- chemosis score
- Basis:
- animal #3
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- chemosis score
- Basis:
- animal #4
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- chemosis score
- Basis:
- animal #5
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 2 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- chemosis score
- Basis:
- animal #6
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 2
- Max. score:
- 4
- Reversibility:
- not reversible
- Remarks:
- Score of 1 at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- iris score
- Basis:
- animal #1
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 2
- Reversibility:
- other: Scoring not possible at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- iris score
- Basis:
- animal #2
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 2
- Reversibility:
- other: Scoring not possible at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- iris score
- Basis:
- animal #3
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 2
- Reversibility:
- other: Scoring not possible at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- iris score
- Basis:
- animal #4
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 2
- Reversibility:
- other: Scoring not possible at 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- iris score
- Basis:
- animal #5
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 2
- Reversibility:
- other: Scoring not possible at 72 hours and 7 days
- Remarks on result:
- positive indication of irritation
- Irritation parameter:
- iris score
- Basis:
- animal #6
- Remarks:
- 0.1 ml
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 2
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- positive indication of irritation
- Irritant / corrosive response data:
- 0.1 ml: severe corneal injury, iritis, severe conjuctival irritation and necrosis of the conjunctivae within 1 h. Because of the severe, possibly irreversible, irritation at 7 days all animals were sacrificed. See table 1.
0.005 ml: minor to severe corneal injury with necrosis of the conjunctivae within 1 h. Two of six had recovered at 7 days and only 2 showed clear effects at 14 and 21 days. See table 2. - Interpretation of results:
- Category 1 (irreversible effects on the eye) based on GHS criteria
- Conclusions:
- A reliable study, conducted largely according to OECD 405, but not GLP, reported severe eye irritation with necrosis in rabbits. The study was terminated for humane reasons at 7 days, when clear effects were still evident in all six animals.
Reference
Table 1: Irritant/corrosive response data, mean for 6 animals, dose 0.1 ml
Score at time point / Reversibility |
Cornea |
Iris |
Conjunctivae |
Chemosis |
Discharge |
||
Opacity Max. score: 4 |
Area involved Max. score 4 |
Congestion/swelling Max. score: 2 |
Redness Max. score: 3 |
Chemosis Max. score: 4 |
Discharge Max. score: 3 |
||
1 h |
2.7 |
3.3 |
*1 |
2.0 |
1.7 |
3.0 |
|
4 h |
2.8 |
2.7 |
*1 |
2.0 |
2.0 |
2.0 |
|
24 h |
2.5 |
2.2 |
1.0 |
2.2 |
1.7 |
3.0 |
|
48 h |
2.8 |
2.2 |
1.0 |
2.3 |
1.5 |
2.8 |
|
72 h |
3.0 |
2.5 |
*1 |
2.3 |
1.7 |
2.7 |
|
7 days |
3.7 |
3.7 |
* |
1.5 |
1.2 |
1.7 |
|
Mean for 24, 48, 72 h |
2.8 |
* |
2.3 |
1.6 |
|||
Reversibility |
Considered possibly irreversible |
||||||
* scoring not possible for 1 or more animals, mean for the remainder is given
Table 2: Irritant/corrosive response data, mean for 6 animals, dose 0.005 ml (data from selected time intervals are presented here)
Score at time point / Reversibility |
Cornea |
Iris |
Conjunctivae |
Chemosis |
Discharge |
|
Opacity Max. score: 4 |
Area involved Max. score 4 |
Congestion/swelling Max. score: 2 |
Redness Max. score: 3 |
Chemosis Max. score: 4 |
Discharge Max. score: 3 |
|
1 h |
1.7 |
2.2 |
1.0 |
2.0 |
1.3 |
2.7 |
24 h |
1.5 |
2.0 |
1.0 |
2.0 |
1.0 |
2.3 |
48 h |
1.5 |
2.2 |
1.0 |
2.0 |
1.0 |
2.0 |
72 h |
1.0 |
1.8 |
1.0 |
1.5 |
0.7 |
1.2 |
7 days |
1.2 |
1.7 |
0.5 |
0.7 |
0 |
0.7 |
21 days |
0.6 |
0.6 |
0 |
0 |
0 |
0 |
Reversibility |
Not fully reversible within 21 days |
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
The key skin irritation study (WIL, 2003) was the only available study for the registered substance for this endpoint that follows an appropriate OECD test guideline and is compliant with GLP and found 3-(trimethoxysilyl)propylamine to be slightly irritant; the effects were not reversed at the end of the observation period. A second study is available and the minimal information it provided confirmed the result of the key study.
The key study for eye irritation was read across from 3-aminopropyltriethoxysilane (CAS 919-30-2) which found the test substance to be highly irritating to the eye (BRRC, 1989). No in vivo eye irritation data are available for the substance which meet the requirements of current guidelines. However, further testing is considered inappropriate because suitable read-across is available supported by a non-standard study (BRRC 1980) which also indicated that the substance is a severe eye irritant, with the neat material causing severe corneal damage with iritis using a small dose volume (0.005 ml).
Read-across justification
To reduce animal testing REACH recommends to make use of a read-across approach where appropriate based on the high accordance in properties relevant for the specific endpoint. In the case of eye irritation the relevant properties are structural similarity as well as physicochemical properties with similar values. In the following paragraphs the proposed read-across from 3-aminopropyltriethoxysilane to 3-(trimethoxysilyl)propylamine is described.
(a) Structural similarity
The registration and read-across substances are structurally similar and are members of an analogue group of amino silane substances. Both contain a silicon atom which is attached to an aminopropyl side chain. The aminopropyl side chains of the two substances are identical. Both substances also have three alkoxy groups bound to silicon. The only difference is that these three alkoxy groups are ethoxy for the read-across substance and methoxy groups for the registration substance. Both hydrolyse rapidly to produce the same silicon-containing hydrolysis product, 3-aminopropylsilanetriol, and either ethanol (for the read-across substance) or methanol (for the registration substance). Furthermore, the amino silane analogue group clearly shows a trend for skin and eye irritancy (PFA, 2015t).
(b) Similar physicochemical characteristics
A data matrix is attached in Section 13 of the IUCLID dossier, and the key physicochemical parameters are summarised below. The similarity of the hydrolysis rates at pH relevant to oral exposure is important. Both parent substances are very soluble in water, have low log Kow and low vapour pressure; they are of similar molecular weight.
Table 5.6.3:Key physicochemical parameters
|
Target (registration substance) |
Source (read-across substance) |
CAS Number |
13822-56-5 |
919-30-2 |
EC number |
237-511-5 |
213-048-4 |
Chemical Name |
3-(Trimethoxysilyl)propylamine |
3-Aminopropyltriethoxysilane |
Purity |
>97% |
>98% |
Impurities |
Siloxane, alkoxysilanes, alcohol and ester |
Siloxane, alkoxysilanes, alcohol and ester |
Molecular weight (gmol-1) |
179.3 |
221.4 |
log Kow(parent) |
-2.8 at pH 7 |
-1.3 at pH 7 |
log Kow(silanol hydrolysis product) |
-4 at pH 7 |
-4 at pH 7 |
Water solubility (parent) |
5.7E+05 mg/l |
1.7E+04 mg/l |
Water solubility (silanol hydrolysis product) |
1E+06 mg/l (predicted, in practice limited to approximately 1000 mg/l by condensation reactions) |
1E+06 mg/l (predicted, in practice limited to approximately 1000 mg/l by condensation reactions) |
Vapour pressure (parent) |
18 Pa at 25°C |
4 Pa at 25°C |
Vapour pressure (silanol hydrolysis product) |
2.5E-04 Pa at 25°C |
2.5E-04 Pa at 25°C |
Hydrolysis t1/2at pH 7 and 20-25°C |
2.6 h |
8.5 h at 24.7°C |
Hydrolysis t1/2at pH 2 and 37.5°C (relevant for oral exposure) |
5 seconds |
5 seconds |
(c) non-silanol hydrolysis products
The non-silanol hydrolysis products, methanol and ethanol, do not contribute to any irritant effects at the relevant concentrations based on publicly available information (OECD, 2004).
Justification for classification or non-classification
On the basis of the in vivo skin irritation study in which effects were not fully reversed by the end of the observation period, 3-(trimethoxysilyl)propylamine requires classification as a skin irritant and labelled Skin Irrit. 2; H315: causes skin irritation, according to Regulation (EC) No 1272/2008.
Based on a read across from 3-aminopropyltriethoxysilane, 3-(trimethoxysilyl)propylamine requires classification as a severe eye irritant and labelled Eye. Dam. 1; H318: causes serious eye damage, according to Regulation (EC) No 1272/2008.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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