Benzotriazole 40% Sodium Salt BTAS

Features Of Benzotriazole 40% Sodium Salt BTAS

1. Highly water-soluble formulation enables rapid and uniform dispersion in aqueous systems without pre-dissolution or solvents.

2. Enhanced corrosion inhibition efficiency for copper, brass, and copper alloys across a broad pH range (6.0–9.5).

3. Thermally stable up to 180 °C, maintaining performance in high-temperature coolant and metalworking fluid applications.

4. Low volatility and negligible vapor pressure reduce inhalation risk and improve workplace safety versus neat benzotriazole.

5. pH-neutral profile minimizes impact on system buffering capacity and compatibility with common additives.

Typical Applications Of Benzotriazole 40% Sodium Salt BTAS

1. Corrosion inhibitor in automotive and industrial engine coolants (OAT and hybrid formulations).

2. Stabilizer in copper electroplating baths and printed circuit board (PCB) etching solutions.

3. Protective additive in metalworking fluids (MWFs), especially soluble oils and semi-synthetics.

4. Preservative in HVAC closed-loop water systems to prevent copper tube pitting and green staining.

5. Functional component in antifreeze/antiboil premixes and extended-life coolant concentrates.

Specifications Of Benzotriazole 40% Sodium Salt BTAS

Compatible Systems Of Benzotriazole 40% Sodium Salt BTAS

Benzotriazole 40% Sodium Salt BTAS – Frequently Asked Questions (FAQ)

Q1: What is the CAS Number for Benzotriazole 40% Sodium Salt BTAS?

A: The CAS Number for sodium benzotriazole (the active ingredient) is 25920-94-3. The formulated 40% aqueous solution does not have a separate CAS; it is identified by the active’s CAS and product designation BTAS.

Q2: What is the typical dosage range in coolant formulations?

A: Recommended treat rate is 0.2–0.5 wt% (2,000–5,000 ppm) in final coolant concentrate, delivering 800–2,000 ppm active benzotriazole equivalent. Optimal dosage depends on copper surface area, water quality, and system operating temperature.

Q3: How does BTAS compare to pure benzotriazole (CAS 90-69-7) in performance and handling?

A: BTAS offers superior handling safety (no dust generation), faster dissolution, and more consistent dosing accuracy. Corrosion inhibition efficacy is equivalent on a molar basis; however, BTAS eliminates the need for solubilizers or elevated temperatures required for crystalline benzotriazole.

Q4: Is BTAS subject to SVHC or REACH authorization requirements?

A: Sodium benzotriazole (CAS 25920-94-3) is not listed on the REACH Candidate List of SVHCs nor the Authorization List (Annex XIV). It is fully REACH registered and compliant for use in EEA markets under current regulations.

Q5: Does BTAS exhibit migration or leaching from polymer components (e.g., radiator hoses, seals)?

A: BTAS shows significantly lower migration potential than free benzotriazole due to its ionic nature and high water solubility. No measurable leaching has been observed in validated tests with EPDM, silicone, and fluorinated elastomers under standard coolant conditions (80 °C, 1,000 hrs).