- ▸ Rubber accelerator: Accelerates sulfur vulcanization of rubber.
- ▸ Corrosion inhibitor: Metal protection in metalworking fluids and antifreeze.
- ▸ Greases & lubricants: Anticorrosive additive.
- ▸ Adhesives: Functional additive in adhesive systems.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →
Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.
⚠ WARNING: This product can expose you to 2-Mercaptobenzothiazole, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
2-Mercaptobenzothiazole (CAS 149-30-4), or MBT, is a benzothiazole rubber accelerator. It accelerates the sulfur vulcanization of natural and synthetic rubber, and is also used as a corrosion inhibitor in metalworking fluids, antifreezes, and greases, and in adhesives.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 205-736-8
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Regulatory restriction status
2-Mercaptobenzothiazole (MBT) (CAS 149-30-4) appears on the regulatory list(s) below. This is public regulatory information about the substance — not a statement about any specific supplier’s material, and not a safety claim. Confirm the current status for your jurisdiction and intended use.
- California Proposition 65: listed for cancer, listed 27 Oct 2017. A California Proposition 65 warning applies (see the warning above).
Sources: ECHA Candidate List / Annex XIV / Annex XVII (echa.europa.eu); U.S. EPA TSCA; UN Stockholm Convention / EU POPs Regulation; California OEHHA Proposition 65 list. Retrieved 2026-07-13.
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Corrosion Inhibitors for Cooling Water (Steel & Copper) (Water Treatment)
- Corrosion Inhibitors for Machined Parts (Industrial Manufacturing)
- Rubber & Elastomer Compounding Ingredients (Industrial Manufacturing)
Frequently Asked Questions
What is 2-mercaptobenzothiazole (MBT) used for?
MBT (CAS 149-30-4) is a benzothiazole rubber accelerator that speeds the sulfur vulcanization of natural and synthetic rubber. It is also used as a corrosion inhibitor in metalworking fluids, antifreezes, and greases, and as a functional additive in adhesives. RawSource supplies it in bulk to rubber and fluid manufacturers.
What is 2-mercaptobenzothiazole 98%?
"98%" refers to the assay (purity) of the technical MBT grade, indicating roughly 98% 2-mercaptobenzothiazole content. Grade and assay are stated on the Certificate of Analysis; confirm the exact specification required for your vulcanization or corrosion-inhibition use when ordering.
Where is mercaptobenzothiazole used industrially?
It is used primarily in the rubber industry as a vulcanization accelerator, and across metalworking fluids, antifreeze/coolant formulations, greases and lubricants, and adhesive systems as an anticorrosive and functional additive. RawSource serves industrial manufacturers in bulk packaging.
What is the solubility of MBT?
MBT is a benzothiazole solid with low water solubility; it is more soluble in alkaline solution (forming the soluble salt) and in organic solvents. Verify exact solubility figures against the SDS and product data sheet for your formulation conditions.
How is MBT shipped, and what is its UN number?
2-Mercaptobenzothiazole is assigned UN 2811. As a regulated material it must be shipped per DOT/IMDG/IATA requirements for its packing group and packaging; RawSource ships it compliantly in bulk with SDS and CoA. Confirm DOT details with our team before booking freight.
What is the REACH and TSCA regulatory status of 2-Mercaptobenzothiazole (MBT)?
2-Mercaptobenzothiazole (MBT) (CAS 149-30-4) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 205-736-8).