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Description of key information

The key study for the skin irritation of triethoxy(3-thiocyanatopropyl)silane (CAS No. 34708-08-2, EC No. 252-161-3) found very slight irritant effects to the skin of rabbit, below the EU threshold for classification (Asta-Werke AG, 1987a, reliability score 2). The study was conducted according to OECD Test Guideline 404 but not in compliance with GLP.

 

The key eye irritation study was conducted according to OECD Test Guideline 405 but not in compliance with GLP and found the test material to be a non-irritant when applied undiluted to the eyes of rabbits (Asta-Werke AG, 1987b, reliability score 2).

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records
Reference
Endpoint:
skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
13 January 1987 to 19 January 1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Deviations:
yes
Remarks:
occlusive application (semi-occlusive recommended), temperature of 22 ± 2 °C (20 ± 3 °C recommended)
Qualifier:
according to guideline
Guideline:
other: 84/449/EEC
GLP compliance:
no
Species:
rabbit
Strain:
other: White Russian (Albino)
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: ASTA-Werke AG, D-4800 Bielefeld 14
- Age at study initiation: 5 to 8 months
- Weight at study initiation: 2.20 to 2.45 kg
- Housing: singly in stainless tell cages type ASTA
- Diet: standard diet ad libitum
- Water: ad libitum
- Acclimation period: at least one day

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 2
- Humidity (%): 55 ± 15
- Air changes (per hr): no data
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 13 January 1987 To: 30 January 1987
Type of coverage:
occlusive
Preparation of test site:
shaved
Vehicle:
unchanged (no vehicle)
Controls:
other: one test patch and one untreated control patch was applied to the dorsal area of each animal
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 mL
Duration of treatment / exposure:
4 hours
Observation period:
~6 days (observation times: 1, 24, 48 and 72 hours after patch removal, and 6 days after application)
Number of animals:
3M
Details on study design:
TEST SITE
- Area of exposure: 6.25 cm2
- % coverage: Not specified
- Type of wrap if used: Linen cloth secured by synthetic film glue, with an occlusive bandage wrapped around the trunk

REMOVAL OF TEST SUBSTANCE
- Washing (if done): no data
- Time after start of exposure: no data

SCORING SYSTEM: Draize method (see "Any other information on materials and methods incl. tables")
Irritation parameter:
erythema score
Basis:
animal #1
Time point:
24/48/72 h
Score:
1
Max. score:
4
Reversibility:
fully reversible within: 6 days
Remarks on result:
no indication of irritation
Irritation parameter:
erythema score
Basis:
animal #2
Time point:
24/48/72 h
Score:
1.33
Max. score:
4
Reversibility:
fully reversible within: 6 days
Remarks on result:
no indication of irritation
Irritation parameter:
erythema score
Basis:
animal #3
Time point:
24/48/72 h
Score:
1
Max. score:
4
Reversibility:
fully reversible within: 6 days
Remarks on result:
no indication of irritation
Irritation parameter:
edema score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
edema score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
4
Reversibility:
fully reversible within: 48 hours
Remarks on result:
no indication of irritation
Irritation parameter:
edema score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
4
Reversibility:
fully reversible within: 48 hours
Remarks on result:
no indication of irritation
Irritant / corrosive response data:
Two animals displayed erythema immediately after patch removal. One animal developed erythema 24 hours after patch removal. In all cases, erythema was grade one, except at 24 hours in one of the animals displaying an immediate reaction, when grade 2 erythema was observed. In each case, erythema was still visible at 72 hours, however, not at five days after patch removal.

Grade 1 oedema was seen in one animal 24 hours after patch removal. This was no longer visible 48 hours after patch removal.
Other effects:
There was no evidence of systemic toxicity or mortality throughout the study.
Interpretation of results:
GHS criteria not met
Conclusions:
In a study conducted according to OECD Test Guideline 404 but not incompliance with GLP (reliability score 2), 0.5 mL of triethoxy(3-cyanatopropyl)silane was slightly irritating (by Draize criteria) to the skin of male rabbits when applied under occlusion for 4 hours. Mean individual 24/48/72-hour erythema scores were 1-1.3 (fully reversible within 6 days), with corresponding mean oedema scores of 0 (either no individual findings or fully reversible within 48 hours).
Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records
Reference
Endpoint:
eye irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
20 January 1987 to 29 January 1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 405 (Acute Eye Irritation / Corrosion)
Deviations:
yes
Remarks:
temperature of 22 ± 2 °C (20 ± 3 °C recommended).
Qualifier:
according to guideline
Guideline:
other: 84/449/EEC
GLP compliance:
no
Species:
rabbit
Strain:
other: White Russian (Albino)
Details on test animals or tissues and environmental conditions:
TEST ANIMALS
- Source: ASTA-Werke AG, D-4800 Bielefeld 14
- Age at study initiation: 6 to 7 months
- Weight at study initiation: 2.40 to 2.85 g
- Housing: singly in stainless steel cages type ASTA
- Diet: standard diet ad libitum
- Water: ad libitum
- Acclimation period: at least one day

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 2
- Humidity (%): 55 ± 15
- Air changes (per hr): no data
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 20 January 1987 To: 23 January 1987
Vehicle:
unchanged (no vehicle)
Controls:
other: one eye of each animal left untreated
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 mL
Duration of treatment / exposure:
Applied on day 1
Observation period (in vivo):
3 days (at 1, 24, 48 and 72 hours after application)
Number of animals or in vitro replicates:
1M, 2F
Details on study design:
REMOVAL OF TEST SUBSTANCE
- Washing (if done): no

SCORING SYSTEM: Draize system (see "Any other information on materials and methods incl. tables")

TOOL USED TO ASSESS SCORE: Cliptrix pencil light
Irritation parameter:
overall irritation score
Basis:
mean
Remarks:
sum of evaluation scores for three eye sections - mean over all timepoints
Score:
2
Max. score:
110
Reversibility:
fully reversible within: 48 hours
Remarks on result:
other: See "Any other information on materials and methods incl. tables" for information on derivation
Irritation parameter:
cornea opacity score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
cornea opacity score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
cornea opacity score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
iris score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
2
Remarks on result:
no indication of irritation
Irritation parameter:
iris score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
2
Remarks on result:
no indication of irritation
Irritation parameter:
iris score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
2
Remarks on result:
no indication of irritation
Irritation parameter:
conjunctivae score
Remarks:
redness
Basis:
animal #1
Time point:
24/48/72 h
Score:
0.33
Max. score:
3
Reversibility:
fully reversible within: 48 hours
Remarks on result:
no indication of irritation
Irritation parameter:
conjunctivae score
Remarks:
redness
Basis:
animal #2
Time point:
24/48/72 h
Score:
0.66
Max. score:
3
Reversibility:
fully reversible within: 48 hours
Remarks on result:
no indication of irritation
Irritation parameter:
conjunctivae score
Remarks:
discharge
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
3
Remarks on result:
no indication of irritation
Irritation parameter:
chemosis score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
chemosis score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
chemosis score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritant / corrosive response data:
No observable effects on the cornea or iris were observed.
Hyperaemia or redness (grade 1 or 2) was seen in the conjunctiva at 1 and 24 h after application. This was resolved within two days of application.
Slight swelling (grade 1) or swelling with partial eversion of lids (grade 2) each occurred in one animal within one hour of treatment and resolved within 24 hours.
Slight discharge was noted in one animal within one hour of application only.
Other effects:
There were no overt signs of systemic toxicity or mortality over the duration of the study.
Interpretation of results:
GHS criteria not met
Conclusions:
In a study conducted according to OECD Test Guideline 405 but not in compliance with GLP (reliability score 2), triethoxy(3-thiocyanatopropyl)silane was non-irritating when 0.1 mL applied undiluted to the eyes of rabbits (one male, two females), with observations up to 72 hours. The mean individual 24/48/72-hour scores were 0 for the cornea, iris, and chemosis (all individual timepoint scores at 24-72 hours were 0). For conjunctival redness, the mean individual 24/48/72-hour scores were 0-0.66, and fully resolved in the two affected animals within 48 hours.
Endpoint conclusion
Endpoint conclusion:
no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

The key skin irritation study was conducted according to OECD Test Guideline 404 but not in compliance with GLP (Asta-Werke AG, 1987a, reliability score 2). The test material (0.5 mL) was noted to be slightly irritating to male rabbit skin following occlusive application for 4 hours. For the three rabbits, mean individual 24/48/72-hour erythema scores were 1-1.3 (fully reversible within 6 days), with corresponding mean oedema scores of 0 (either no individual findings or fully reversible within 48 hours). There were no signs of systemic toxicity, or mortality throughout the study.

 

The key study for eye irritation of triethoxy(3-thiocyanatopropyl)silane was conducted according to OECD Test Guideline 405 but not in compliance with GLP (Asta-Werke AG, 1987b, reliability score 2). The test substance was non-irritating when 0.1 mL was applied undiluted to the eyes of rabbits (one male, two females), with observations up to 72 hours. The mean individual 24/48/72-hour scores were 0 for the cornea, iris, and chemosis (all individual timepoint scores at 24-72 hours were 0). For conjunctival redness, the mean individual 24/48/72-hour scores were 0-0.66, and fully resolved in the two affected animals within 48 hours. There were no overt signs of systemic toxicity or mortality throughout the course of the study.

 

There is no indication of corrosivity in any of the available studies.

Justification for classification or non-classification

Based on the available information, no classification is required for skin or eye irritation in accordance with Regulation (EC) No. 1272/2008.