NITE - Chemical Management Field

Latest GHS Classification Results by the Japanese Government (edited by NITE)

GENERAL INFORMATION

Item	Information
CAS RN	97-72-3
Chemical Name	Isobutyric anhydride
Substance ID	m-nite-97-72-3_v1
Download of Excel format	Excel file

REFERENCE INFORMATION

Item	Information
Guidance used for the classification (External link)	To Guidance List
UN GHS document (External link)	To UN GHS document
FAQ（GHS classification results by the Japanese Government）	To FAQ
List of Information Sources (Excel file)	List of Information Sources
List of Definitions/Abbreviations	Definitions/Abbreviations
Sample Label by MHLW (External link)	To Workplace Safety Site (MHLW)
Sample SDS by MHLW (External link)	To Workplace Safety Site (MHLW)
OECD/eChemPortal (External link)	To OECD/eChemPortal (External link)

PHYSICAL HAZARDS

Hazard class		Classification	Pictogram Signal word	Hazard statement (code)	Precautionary statement (code)	Rationale for the classification	Classification year (FY)	GHS Classification Guidance for the Japanese Government
1	Explosives	Not classified (Not applicable)	- -	-	-	There are no chemical groups associated with explosive properties present in the molecule.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
2	Flammable gases	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
3	Aerosols	Not classified (Not applicable)	- -	-	-	Not aerosol products.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
4	Oxidizing gases	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
5	Gases under pressure	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
6	Flammable liquids	Category 4	- Warning	H227	P370+P378 P210 P280 P403 P501	Since its flash point reported 67 degC (closed-cup) (GESTIS (Access on Sept. 2010)) is > 60 degC and <= 93 degC, the substance corresponds to Category 4.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
7	Flammable solids	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
8	Self-reactive substances and mixtures	Not classified (Not applicable)	- -	-	-	There are no chemical groups present in the molecule associated with explosive or self-reactive properties.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
9	Pyrophoric liquids	Not classified	- -	-	-	Since its autoignition temperature is 329 degC (Hommel (1996)), it is considered that the substance does not ignite at room temperature.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
10	Pyrophoric solids	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
11	Self-heating substances and mixtures	Classification not possible	- -	-	-	Test methods applicable to liquid substances are not available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
12	Substances and mixtures which, in contact with water, emit flammable gases	Not classified (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).	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
13	Oxidizing liquids	Not classified (Not applicable)	- -	-	-	The substance is an organic compound containing oxygen which is chemically bonded only to carbon.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
14	Oxidizing solids	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
15	Organic peroxides	Not classified (Not applicable)	- -	-	-	Organic compounds containing no bivalent -O-O- structure.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
16	Corrosive to metals	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
17	Desensitized explosives	-	- -	-	-	-	-	-

HEALTH HAZARDS

Hazard class		Classification	Pictogram Signal word	Hazard statement (code)	Precautionary statement (code)	Rationale for the classification	Classification year (FY)	GHS Classification Guidance for the Japanese Government
1	Acute toxicity (Oral)	Classification not possible	- -	-	-	No data were available. As relevant information, the rat LD50 value of > 500 mg/kg was reported (SIDS (J) (Access on Sep. 2010)) for isobutyric acid as the hydrolysate of the substance. [For health hazards, refer also to isobutyric acid (CAS; 79-31-2) as the hydrolysate of the substance.]	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
1	Acute toxicity (Dermal)	Classification not possible	- -	-	-	No data were available. As relevant information, the rabbit LD50 value of > 200 mg/kg was reported (SIDS (J) (Access on Sep. 2010)) for isobutyric acid as the hydrolysate of the substance.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
1	Acute toxicity (Inhalation: Gases)	Not classified (Not applicable)	- -	-	-	Liquid (GHS definition)	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
1	Acute toxicity (Inhalation: Vapours)	Classification not possible	- -	-	-	Although the rat LC50 value of > 5.1 mg/L was reported (SIDS (J) (Access on Sep. 2010)), the value did not provide the basis for the classification, the classification was not possible. Since the test concentration (5.1 mg/L) was lower than 90% of the saturated vapor pressure concentration (42.6 mg/L), the criterion values for gas were adopted.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
1	Acute toxicity (Inhalation: Dusts and mists)	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
2	Skin corrosion/irritation	Category 1	Danger	H314	P301+P330+P331 P303+P361+P353 P305+P351+P338 P304+P340 P260 P264 P280 P310 P321 P363 P405 P501	The substance is rapidly hydrolyzed to isobutyric acid by contact with water (SIDS (J) (Access on Sep. 2010)). Thus, the substance was classified as Category 1 based on the document that open application of isobutyric acid to rabbit skin caused some necrosis within 24 hours (PATTY, 5th (2001)).	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
3	Serious eye damage/eye irritation	Category 1	Danger	H318	P305+P351+P338 P280 P310	The substance is rapidly hydrolyzed to isobutyric acid by contact with water (SIDS (J) (Access on Sep. 2010)). Thus, the substance was classified as Category 1 based on the document that instillation of isobutyric acid to rabbit eyes caused severe corneal burning (PATTY, 5th (2001)), and its preexisting classification for skin corrosion/irritation was Category 1.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
4	Respiratory sensitization	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
4	Skin sensitization	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
5	Germ cell mutagenicity	Classification not possible	- -	-	-	No data were available. As relevant information, it was reported that isobutyric acid was negative in the Ames test (SIDS (J) (Access on Sep. 2010)).	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
6	Carcinogenicity	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
7	Reproductive toxicity	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
8	Specific target organ toxicity - Single exposure	Category 3 (Respiratory tract irritation)	Warning	H335	P304+P340 P403+P233 P261 P271 P312 P405 P501	Based on the clinical sign such as rales (breathing sound) and nasal discharge observed in the acute inhalation study in rats (LC50 > 5.1 mg/L), it was concluded that the substance caused irritating effects to the upper respiratory tract (SIDS (J) (Access on Sep. 2010)). Therefore, the substance was classified as Category 3 (respiratory tract irritation).	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
9	Specific target organ toxicity - Repeated exposure	Classification not possible	- -	-	-	No data were available. As relevant information, there was a report describing that single inhalation of the substance caused irritation to the upper respiratory tract and repeated exposure might exacerbate the irritating effects (SIDS (J) (Access on Sep. 2010)).	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
10	Aspiration hazard	Classification not possible	- -	-	-	No data available.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）

ENVIRONMENTAL HAZARDS

Hazard class		Classification	Pictogram Signal word	Hazard statement (code)	Precautionary statement (code)	Rationale for the classification	Classification year (FY)	GHS Classification Guidance for the Japanese Government
11	Hazardous to the aquatic environment Short term (Acute)	Category 3	- -	H402	P273 P501	This substance is thought to be rapidly hydrolyzed into isobutyric acid (CAS No. 79-31-2) in water (the half-life in water = 2.407 minutes (pH = 8), 24.067 minutes (pH = 7) (HYDROWIN)). Although there are no data available on isobutyric anhydride, the substance is classified into Category 3 from 72h-EC50 of isobutyric acid = 45 mg/L (39.9 mg/L as isobutyric anhydride) for algae (Scenedesmus subspicatus) (IUCLID, 2000).	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
11	Hazardous to the aquatic environment Long term (Chronic)	Not classified	- -	-	-	This substance is thought to be rapidly hydrolyzed into isobutyric acid (CAS No. 79-31-2) in water (the half-life in water = 2.407 minutes (pH = 8), 24.067 minutes (pH = 7) (HYDROWIN)). This substance is classified as "Not classified" since isobutyric acid is rapidly degradable (28d-degradation rate tested by OECD TG301C: > 60% (IUCLID, 2000)) and it is estimated not to be bioaccumulative (LogPow = 1.24 (PHYSPROP Database, 2011)) though its acute toxicity is Category 3.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）
12	Hazardous to the ozone layer	Classification not possible	- -	-	-	This substance is not listed in Annexes to the Montreal Protocol.	FY2010	GHS Classification Guidance by the Japanese Government （July, 2010）

NOTE:

GHS Classification Result by the Japanese Government is intended to provide a reference for preparing a GHS label or SDS for users. To include the same classification result in a label or SDS for Japan is NOT mandatory.
Users can cite or copy this classification result when preparing a GHS label or SDS. Please be aware, however, that the responsibility for a label or SDS prepared by citing or copying this classification result lies with users.
This GHS classification was conducted based on the information sources and the guidance for classification and judgement which are described in the GHS Classification Guidance for the Japanese Government etc. Using other literature, test results etc. as evidence and including different content from this classification result in a label or SDS are allowed.
Hazard statement and precautionary statement will show by hovering the mouse cursor over a code in the column of "Hazard statement" and "Precautionary statement," respectively. In the excel file, both the codes and statements are provided.
A blank or "-" in the column of "Classification" denotes that a classification for the hazard class was not conducted in the year.
An asterisk “*” in the column of “Classification” denotes that “Not classified (or No applicable)” and/or “Classification not possible” is applicable. Details are described in the column of “Rationale for the classification”. If no English translation is available for “Rationale for the classification,” please refer to the Japanese version of the results.

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