Mercaptobenzothiazole

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]

Biomedical References

4 mg/m3 (inhalable fraction), 1.5 mg/m3 (respirable fraction)

0.000464 mm Hg

2 ppm

LC50 (rat) > 1,270 mg/m3

Explanatory Notes

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

5 mg/m3

Yes

Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion

Probable (2a)

Diseases

Occupational diseases associated with exposure to this agent:

• Contact dermatitis, allergic

Processes

Industrial Processes with risk of exposure:

• Leather Tanning and Processing
• Metal Machining
• Pulp and Paper Processing
• Working with Glues and Adhesives