Chemical Name:6-Methyl-2-thiouracil; Methylthiouracil
CAS:56-04-2
ID: | 4 |
Classifier: | Ministry of Health, Labour and Welfare (MHLW), Ministry of the Environment (MOE) |
Year Classified: | FY2007 |
Reference Manual: |
GHS Classification Manual (10 Feb, 2006) Technical Guidance Document on the GHS Classification (6 Dec, 2005) |
Hazard class | Classification | Symbol | Signal word | Hazard statement | Precautionary statement | Rationale for the classification | |
---|---|---|---|---|---|---|---|
1 | Explosives | Not applicable | - | - | - | - | There are no chemical groups associated with explosive properties present in the molecules. |
2 | Flammable gases (including chemically unstable gases) | Not applicable | - | - | - | - | Solid (GHS definition) |
3 | Aerosols | Not applicable | - | - | - | - | Not aerosol products. |
4 | Oxidizing gases | Not applicable | - | - | - | - | Solid (GHS definition) |
5 | Gases under pressure | Not applicable | - | - | - | - | Solid (GHS definition) |
6 | Flammable liquids | Not applicable | - | - | - | - | Solid (GHS definition) |
7 | Flammable solids | Classification not possible | - | - | - | - | No data available. |
8 | Self-reactive substances and mixtures | Not applicable | - | - | - | - | There are no chemical groups present in the molecule associated with explosive or self-reactive properties. |
9 | Pyrophoric liquids | Not applicable | - | - | - | - | Solid (GHS definition) |
10 | Pyrophoric solids | Classification not possible | - | - | - | - | No data available. |
11 | Self-heating substances and mixtures | Classification not possible | - | - | - | - | No data available. |
12 | Substances and mixtures which, in contact with water, emit flammable gases | Not applicable | - | - | - | - | The chemical structure of the substance does not contain metals or metalloids (B, Si, P, Ge, As, Se, Sn, Sb, Te, Bi, Po, At). |
13 | Oxidizing liquids | Not applicable | - | - | - | - | Solid (GHS definition) |
14 | Oxidizing solids | Not applicable | - | - | - | - | The substance contains oxygen (but not fluorine or chlorine) which is chemically bonded only to carbon or hydrogen. |
15 | Organic peroxides | Not applicable | - | - | - | - | Organic compounds containing no bivalent -O-O- structure |
16 | Corrosive to metals | Classification not possible | - | - | - | - | No data available. |
Hazard class | Classification | Symbol | Signal word | Hazard statement | Precautionary statement | Rationale for the classification | |
---|---|---|---|---|---|---|---|
1 | Acute toxicity (Oral) | Category 4 | Warning | H302: Harmful if swallowed |
P301+P312: IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell. P264: Wash ... thoroughly after handling. P270: Do not eat, drink or smoke when using this product. P330: Rinse mouth. P501: Dispose of contents/container to ... |
Based on the LD50 of 1500 mg/kg obtained in a rat oral administration test (RTECS, accessed in August 2007), the substance was classified into Category 4. | |
1 | Acute toxicity (Dermal) | Classification not possible | - | - | - | - | No data available. |
1 | Acute toxicity (Inhalation: Gases) | Not applicable | - | - | - | - | Since the substance is a solid (GHS definition), it was classified into the "Not applicable" category. |
1 | Acute toxicity (Inhalation: Vapours) | Classification not possible | - | - | - | - | No data available. |
1 | Acute toxicity (Inhalation: Dusts and mists) | Classification not possible | - | - | - | - | No data available. |
2 | Skin corrosion/irritation | Classification not possible | - | - | - | - | No data available. |
3 | Serious eye damage/eye irritation | Classification not possible | - | - | - | - | No data available. |
4 | Respiratory sensitization | Classification not possible | - | - | - | - | No data available. |
4 | Skin sensitization | Classification not possible | - | - | - | - | No data available. |
5 | Germ cell mutagenicity | Not classified | - | - | - | - | Among in vivo mutagenicity tests using somatic cell, micronucleus tests using mouse peripheral blood cells and micronucleus tests using bone marrow cells of pregnant mice gave negative results (IARC 79 (2001)). Thus, the substance was classified into the "Not classified" category. As additional background information, a micronucleus test using blood cells of fetal mice gave weak positive results (IARC 79 (2001)). However, the IARC questioned the reliability of the test and treated it as a negative test. |
6 | Carcinogenicity | Category 2 | Warning | H351: Suspected of causing cancer |
P308+P313: IF exposed or concerned: Get medical advice/attention. P201: Obtain special instructions before use. P202: Do not handle until all safety precautions have been read and understood. P281: Use personal protective equipment as required. P405: Store locked up. P501: Dispose of contents/container to ... |
Since the substance is rates as Group 2B by IARC 79 (2001), it was classified into Category 2. | |
7 | Reproductive toxicity | Classification not possible | - | - | - | - | Classification not possible due to lack of data. According to IARC 79 (2001), methylthiouracil crossed the placental barrier and was excreted in the milk. Since these effects on infants are not known, classification is not possible. |
8 | Specific target organ toxicity - Single exposure | Classification not possible | - | - | - | - | No data available. |
9 | Specific target organ toxicity - Repeated exposure | Category 1 (blood system) | Danger | H372: Cause damage to organs through prolonged or repeated exposure (blood system) |
P260: Do not breathe dust/fume/gas/mist/vapours/spray. P264: Wash ... thoroughly after handling. P270: Do not eat, drink or smoke when using this product. P314: Get medical advice/attention if you feel unwell. P501: Dispose of contents/container to ... |
According to IARC 79 (2001), human exposure to methylthiouracil is associated with a high frequency of granulocytopenia. Since an effect of this substance on the blood system is detected, it was classified into Category 1 (blood system). | |
10 | Aspiration hazard | Classification not possible | - | - | - | - | No data available. |
Hazard class | Classification | Symbol | Signal word | Hazard statement | Precautionary statement | Rationale for the classification | |
---|---|---|---|---|---|---|---|
11 | Hazardous to the aquatic environment (Acute) | Classification not possible | - | - | - | - | No data available. |
11 | Hazardous to the aquatic environment (Long-term) | Classification not possible | - | - | - | - | No data available. |
* Classification was conducted by relevant Japanese Ministries in accordance with GHS Classification Guidance for the Japanese Government, and is intended to provide a reference for preparing GHS labelling and SDS for users. * This is a provisional English translation of classification results and is subject to revision without notice. * The responsibility for any resulting GHS labelling and SDS referenced from this site is with users. |
Reference Manual |
|
Definitions / Abbreviations |
|
Model Label by MHLW |
MHLW Website (in Japanese Only) |
Model SDS by MHLW |
MHLW Website (in Japanese Only) |