Benzotriazole Fine Granular 99%
The base yellow-metal inhibitor, as a 99 percent fine granular solid released against an eight-point specification. Held in stock in the United States.
The base yellow-metal inhibitor, as a 99 percent fine granular solid released against an eight-point specification. Held in stock in the United States.
Benzotriazole is the base yellow-metal corrosion inhibitor and the one most formulations mean when they call for an azole without qualifying it. It is a heterocyclic compound carrying three nitrogen atoms in the ring, and PAT supplies it as a fine granular solid at 99 percent, white to slightly yellow, released against an eight-point specification.
What the molecule does is build a film. Benzotriazole bonds to a copper surface and forms an insoluble copper-azole layer only a few molecules thick. That layer blocks the corrosive species, mainly chloride and sulfate, from reaching the metal underneath, and it does the job at dose rates measured in parts per million. The surface ends up passivated, so it resists pitting, tarnish and the copper dissolution that goes on to drive galvanic attack elsewhere in a system.
PAT's technical data sheet names copper and its alloys as the primary target and then extends the list. Zinc, cobalt and silver are protected directly. In a multi-metal system running alongside other corrosion inhibitors, benzotriazole will also protect aluminum and steel, which is why it appears in blended packages as often as it appears on its own.
Two rows on the specification do work the assay does not. Chlorides at 20 ppm maximum matters because chloride is the species the film exists to exclude, and material that carries its own chloride load works against itself. OPDA at 10 ppm maximum is the residual ortho-phenylenediamine from the synthesis, and it is the row a buyer with a color or an odor sensitivity reads first.
This is the grade PAT holds in United States stock and ships from a domestic warehouse. It is sold by the drum, so a formulator running an intermittent or small requirement does not need an import program to get material.
The CAS Registry Number is 95-14-7. It is also written as benzotriazole, BTA, 1H-benzotriazole, benzotriazole 99, and benzotriazole fine granular.
| Property | Specification |
|---|---|
| Appearance | White or slightly yellow fine granules |
| Assay content | 99.8 percent minimum |
| Water | 0.08 percent maximum |
| Melt point | 98 to 99 degrees C |
| Ash | 0.02 percent maximum |
| pH | 5.0 to 6.0 |
| Chlorides | 20 ppm maximum |
| OPDA | 10 ppm maximum |
These are specification limits from the technical data sheet, not typical values. Every batch is released against them and the certificate of analysis reports the measured result. We will send the current TDS and the batch documentation your qualification needs.
Tell us the binder system, the property you are targeting, and the volume you expect. We will confirm the grade, send the documentation, and ship a sample from North American stock.
Yellow-metal passivation in open recirculating and closed-loop systems, protecting copper and brass against chloride and sulfate attack.
Protects copper and brass in VCI papers and films, holding a bright metal surface through transport and storage.
Copper and yellow-metal protection in soluble-oil, semi-synthetic and synthetic fluids, in the sump and on the part.
Surface treatment and anti-tarnish for copper, brass and silver on plating and finishing lines.
Yellow-metal protection where copper attack would degrade the fluid as well as the equipment.
The anti-tarnish action that keeps silver and copper bright, used in polishes, dips and protective films.
Dissolves cleanly into water-borne systems where a copper or brass component has to be protected in the can or on the substrate.
It is specified where the formulation needs passivates copper, brass, bronze and other yellow metals at parts-per-million dose rates, also protects zinc, cobalt and silver, and aluminum and steel in a multi-metal package, released against an eight-point specification, including chlorides and residual OPDA, A dry solid, so it ships and stores compactly and blends into powders, held in United States stock and shipped from a domestic warehouse, and sold by the drum, with no import program needed for a small or intermittent requirement.
Benzotriazole is a solid and most systems meet it as a solution. It is normally dissolved into water, into a glycol, or into the alcohol or glycol-ether portion of a formulation, then metered as a concentrate. Where the end system is already a liquid feed, the sodium salt at 40 percent removes the dissolving step entirely.
Dose rates are low. Yellow-metal passivation is a surface effect and not a bulk one, so the film forms and holds at concentrations measured in parts per million of the circulating water. Overdosing does not build a thicker film, it just carries inventory.
Handle the dust. PAT's safety data sheet directs the user to avoid the formation of dust and aerosols and to provide appropriate exhaust ventilation wherever dust is generated, and to avoid contact with skin and eyes. That is the handling instruction that matters with a fine granular solid.
Read the current safety data sheet before handling. The classification on these products is under active review in more than one jurisdiction, so the sheet that shipped with an older lot is not necessarily the sheet that applies now. Ask and we will send the current one.
Package sizes: 25 kg (55.115 lb) fiber drums..
Storage: Keep the container tightly closed in a dry, well-ventilated place. The material is a stable solid and is supplied with a five-year best-by interval from the date of manufacture on the certificate of analysis.
PAT's safety data sheet records that this product does not contain any chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. It contains no chemical components above the de minimis reporting thresholds established by SARA Title III Section 313, and no components subject to SARA Title III Section 302 reporting. Benzotriazole appears on the Massachusetts, Pennsylvania and New Jersey right-to-know substance lists. PAT's allergen statement records the product as free of all thirteen declared allergens under FDA guidance and EU 1169/2011 Annex II, and as not containing or deriving from genetically modified organisms. Refer to the current safety data sheet for hazard classification. Tell us which inventory listings or jurisdictions your qualification needs confirmed and we will confirm them in writing.
Tolyltriazole is benzotriazole with a methyl group on the ring, and the difference shows up in service and not in purity. Both are released at 99.8 percent minimum here. Tolyltriazole is the grade usually chosen where a system runs hot or carries an oxidizing biocide such as chlorine, so it is common in chlorinated cooling water, in engine coolant and in long-life high-temperature fluids. Benzotriazole is the base inhibitor and the default where those conditions do not apply. The melt points differ too, 98 to 99 degrees C here against 84 to 87 for tolyltriazole.
Both, and they are doing different jobs. The technical data sheet carries PAT's specification, which is the tighter of the two. The certificate of analysis carries the release limits for the lot in front of you and reports the measured result against them. On recent lots the measured results have cleared the data sheet comfortably on every shared row. If your qualification is being written against a document, tell us which one and we will send it, and we will confirm in writing which limits your lots will be released against before you specify them.
OPDA is ortho-phenylenediamine, the residual from the synthesis route, held at 10 ppm maximum. It is on the specification because it is the row that matters to a buyer with a color or odor sensitivity in the finished formulation, and because most sheets in this chemistry do not report it at all. The certificate of analysis does not carry an OPDA result, so ask if your specification requires one on the lot.
Yellow-metal passivation works at parts per million in the circulating water, not at percent loadings, because the film is a surface effect a few molecules thick. The right number depends on the system, the metallurgy, the temperature and what else is in the package, so it is set from the water chemistry and not read off a data sheet. Tell us the system and we will point you at the dosing article and at a starting range.
It is a handling decision, not a performance one. The solid ships and stores compactly, suits a formulator who dissolves a concentrate or blends a dry package, and costs nothing to freight in water. The sodium benzotriazole liquid at 40 percent is already in water and already alkaline, and goes straight into a liquid feed with no dissolving step. If you meter liquid, take the liquid.
It is held in stock in the United States and ships across the United States, Canada and Mexico. Standard packaging is 25 kg fiber drums, which is 55.115 lb, and we sell by the drum. Tell us the volume and the lead time you need and we will confirm both with the quote.
Read the current safety data sheet before handling, and ask us for it instead of relying on a copy that came with an older lot. The practical handling point is dust: PAT's sheet directs the user to avoid forming dust and aerosols, to provide exhaust ventilation where dust is generated, and to avoid contact with skin and eyes. Classification for this chemistry is under active review in more than one jurisdiction, which is exactly why we send the current sheet instead of summarizing it here.
Yes. We send the Technical Data Sheet (TDS), Safety Data Sheet (SDS), Certificate of Analysis (COA), and Allergen and GMO Statement on request, in the current revision. Use Request TDS or SDS above and tell us what your qualification review needs.
The methyl-substituted grade, for hot systems and chlorinated water.
The same chemistry as a ready-to-meter aqueous liquid.
Grades, forms and what we hold in stock.
The selection question this grade raises, answered on temperature and biocide.
Yellow-metal passivation in open recirculating and closed-loop systems.
Copper protection in the sump, on the part and inside the wrap.
What a starting dose looks like and what moves it.
The copper-azole film, and why it holds at parts per million.