- ▸ Corrosion inhibition: Copper and copper-alloy protection in coolants and antifreeze
- ▸ Water treatment: Yellow-metal inhibitor in industrial water systems
- ▸ Metalworking fluids: Corrosion-control additive
- ▸ Chemical intermediate: Building block for derivative chemistries
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 →Tolyltriazole (CAS 29385-43-1), the methyl-substituted benzotriazole, is a nitrogen heterocycle used principally as a metal corrosion inhibitor. It protects copper and copper-alloy surfaces in coolants, antifreeze, metalworking fluids, and water-treatment systems, and also serves as a chemical intermediate.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 249-596-6
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
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)
Frequently Asked Questions
What is methylbenzotriazole (TTA) used for?
Tolyltriazole (TTA, the methyl-substituted benzotriazole, CAS 29385-43-1) is used principally as a metal corrosion inhibitor. It protects copper and copper-alloy (yellow-metal) surfaces in coolants, antifreeze, metalworking fluids, and industrial water-treatment systems, and also serves as a chemical intermediate. RawSource supplies it in bulk.
What is methylbenzotriazole also known as?
Methylbenzotriazole is commonly known as tolyltriazole or TTA, and appears as 5-methyl-1H-benzotriazole / 4-methyl-1H-benzotriazole (a methyl isomer mixture); CAS 29385-43-1. It is a methyl-substituted analog of benzotriazole (BTA). RawSource distributes it as a corrosion-inhibitor active.
How does tolyltriazole inhibit corrosion on copper?
Tolyltriazole is a nitrogen heterocycle that forms a thin, adherent protective film on copper and copper-alloy surfaces, suppressing oxidation and metal-ion release. This is why it is dosed into coolants, antifreeze, and recirculating water systems to protect yellow metals. Refer to the SDS for handling and dosing guidance.
What grades and packaging does RawSource supply for tolyltriazole?
Tolyltriazole is available as a solid (powder/granule) and as liquid sodium-salt solutions used in water-treatment dosing. Confirm whether you need the solid TTA or a solution and we will match the appropriate grade. RawSource ships in bulk with a CoA and SDS per lot.
What is the cost of bulk methylbenzotriazole (tolyltriazole)?
Bulk pricing depends on form (solid or solution), volume, purity, and delivery point. We quote per order rather than listing spot pricing — request a bulk quote and RawSource will return current pricing along with the CoA and SDS.
What is the REACH and TSCA regulatory status of Tolyltriazole (Methylbenzotriazole, TTA)?
Tolyltriazole (Methylbenzotriazole, TTA) (CAS 29385-43-1) 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 249-596-6).