Agent Name

Mercaptobenzothiazole

CAS Number

149-30-4

Formula

C7-H5-N-S2

Major Category

Plastics & Rubber

Synonyms

2(3H)-Benzothiazolethione; 2-Benzothiazolethiol; 2-Benzothiazolinethione; 2-Benzothiazolyl mercaptan; 2-MBT; 2-Mercaptobenzothiazole; 2-Mercaptobenzthiazole; 2-Mercptobenzothiazole; 2-Merkaptobenzotiazol [Polish]; 2-Merkaptobenzthiazol [Czech]; AG 63; Accel M; Accelerator M; Benzothiazole, mercapto-; Benzothiazole-2-thione; Benzothiazolethiol; Captax; Dermacid; Ekagom G; Kaptaks; Kaptax; Kaptax [Czech]; MBT; Mebetizole; Mebithizol; Mercaptobenzothiazol; Mercaptobenzothiazole; Mercaptobenzothiazole (VAN); Mercaptobenzthiazole; Mertax; Nuodeb 84; Nuodex 84; Pennac MBT powder; Pneumax MBT; Rokon; Rotax; Royal MBT; Soxinol M; Sulfadene; Thiotax; USAF XR-29; Vulkacit M; Vulkacit mercapto; Vulkacit mercapto/C; [ChemIDplus]

Category

Rubber Additives

Description

Yellowish to tan crystalline powder; [HSDB]

Sources/Uses

Nonrubber sources of exposure include metalworking fluids, antifreezes, greases, anticorrosive agents, adhesives, detergents, and veterinary products. [Marks, p. 101] Allergic contact dermatitis in shoemakers; [Marks] A known skin sensitizer, mercaptobenzothiazole has largely been replaced as an anti-corrosion agent in metalworking fluids. [Kanerva, p. 717] "Metal indicators are organic compounds that form specifically colored metal ion complexes in aqueous media. These dye reactions can be employed for detection of the equivalence point in volumetry (complexometry), as well as for concentration determinations in colorimetry or photometry." 2-Mercaptobenzothiazole is used for the photometric determination of Au, Cd, Cu, Pb, and Pd. [Ullmann] Used in leather tanning; [PMID 21938525]

Comments

A rubber accelerator, MBT is the most common cause of shoe allergy and second to the thiurams as the cause of glove contact dermatitis. [Marks, p. 100-2] An eye irritant; May cause skin sensitization; [ICSC] Mice show severe liver damage after high-dose feeding for 1 week; [AIHA] See "Carcinogenicity of some industrial chemicals," Volume 115. [IARC, News Release, 23 February 2016]

Exposure Assessment
MAK

4 mg/m3

WEEL

5 mg/m3

Vapor Pressure

0.000464 mm Hg

Odor Threshold Low

2 mg/m3

Lethal Concentration

LC50 (rat) > 1,270 mg/m3

Explanatory Notes

Flash point = 392 deg F; Odor threshold from CHEMINFO;

Adverse Effects
Skin Sensitizer

Yes

Hepatotoxin

Hepatotoxin, Secondary

IARC Carcinogen

Probable Carcinogen

Links to Other NLM Databases
Health Studies

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Toxicity Information

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Chemical Information

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Biomedical References

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: