Copper Corrosion Inhibitor is often chosen because it conducts heat and electricity well and usually performs reliably for many years. Brass and other copper alloys offer similar advantages. Still, these metals are not completely free from corrosion.

A copper tube inside a cooling system may slowly develop surface deposits. Brass fittings can lose their original finish after contact with moisture, salts, or aggressive cleaning chemicals. Decorative copper may darken, while parts exposed to polluted water can show green or blue staining. Such problems are common in industrial systems across Qatar. Cooling towers, HVAC installations, heat exchangers, marine equipment, electrical parts, and process lines may all contain copper or brass. High temperatures, coastal humidity, chloride contamination, and changes in water quality can increase the rate of surface attack.

G-6 is a powdered Copper Corrosion Inhibitor used to protect copper, brass, silver, and containing alloys. It reacts with the oxide already present on copper and creates a very thin protective complex. This layer helps slow oxidation, staining, tarnish, and other forms of corrosion.

Nassguard supplies G-6 in Doha and throughout Qatar for cooling-water treatment, metalworking fluids, industrial cleaners, protective coatings, packaging materials, copper processing, and yellow-metal protection.

What is G-6?

G-6 is a high-assay benzotriazole powder developed mainly for copper and copper-based alloys.

The material normally appears white or slightly off-white. Formulators can add it to suitable water-based or solvent-based systems, depending on the intended use and the chemistry of the finished product.

When G-6 reaches a copper surface, it reacts with copper oxide and creates an insoluble copper-benzotriazole complex. The protective layer is extremely thin, measuring only around 10 to 20 molecules. Although microscopic, it acts as a barrier between the metal and the surrounding environment.

The film helps reduce both chemical and electrochemical attack. It also shows good resistance to heat and oxidation under appropriate working conditions.

Another useful property is the ability to bind dissolved copper ions. Loose copper ions can travel through a liquid system and deposit on another metal. This may create local galvanic cells and accelerate corrosion. By forming a complex with those ions, G-6 can help limit this type of damage.

The product can enter liquid formulations, protective coatings, cleaners, waxes, wrapping paper, interleaving materials, coolants, and functional fluids.

Uses of G-6 Copper Corrosion Inhibitor

• Cooling towers and circulating-water systems
• Commercial and industrial HVAC circuits
• Copper and brass heat exchangers
• Automotive coolant formulations
• Hydraulic fluids
• Metalworking fluids
• Specialty lubricants
• Acid-cleaning formulations
• Alkaline-cleaning formulations
• Detergents for copper and brass parts
• Protective lacquers
• Temporary wax coatings
• Copper-sheet treatment
• Brass-sheet and coil protection
• Wrapping paper for copper components
• Interleaving sheets and boxboard
• Packaging for silver articles
• Decorative copper and brass items
• Industrial fittings and fabricated parts
• Sculptures, artefacts, and ornamental metalwork

Key Features of G-6

• Designed mainly for copper protection
• Suitable for brass and copper alloys
• Can also support silver protection
• Supplied as a high-purity powder
• Uses benzotriazole chemistry
• Creates an insoluble protective complex
• Helps reduce copper tarnishing
• Helps slow oxidation
• Provides electrochemical protection
• Provides a physical surface barrier
• Offers good thermal stability
• Offers good oxidative stability
• Can bind dissolved copper ions
• May reduce copper-related galvanic attack
• Works in compatible aqueous formulations
• Works in compatible non-aqueous systems
• Suitable for coolants and functional fluids
• Can be added to cleaners and coatings
• Useful in protective packaging materials
• Effective at relatively low concentration

How Does G-6 Protect Copper?

Copper reacts naturally with oxygen. This reaction creates a thin oxide layer on the surface. In clean, mild conditions, the oxide may offer some limited protection. However, salts, acids, oxidising chemicals, polluted water, and high humidity can continue attacking the metal.

G-6 uses the existing oxide layer as part of the protection process.

Once the benzotriazole molecules reach the copper, they react with copper oxide and produce an insoluble complex. This complex spreads across the surface and forms a microscopic film.

The film restricts the movement of moisture and corrosive ions towards the metal. It also slows the electrochemical reactions responsible for tarnishing and corrosion.

G-6 may also bind copper ions that have already entered the surrounding liquid. This helps prevent those ions from moving elsewhere in the system and depositing on steel, aluminium, or another metal.

Performance can change according to:

• G-6 concentration
• Water quality
• Chloride level
• Fluid temperature
• Operating pH
• Flow rate
• Copper-alloy composition
• Surface cleanliness
• Oxidising biocides
• Other additives in the formulation

A controlled trial should therefore take place before large-scale use.

Applications Across Qatar and Doha

Cooling Towers-Copper tubes, brass valves, fittings, and heat-exchanger sections may come into regular contact with treated circulating water. G-6 can form part of a compatible treatment programme designed to protect these yellow-metal components.

HVAC Systems-Large buildings, hotels, hospitals, shopping centres, and industrial properties in Doha may use copper-containing air-conditioning systems. Changing water chemistry and high operating temperatures can affect internal surfaces over time.

Oil and Gas Facilities-Processing plants, refineries, and gas facilities often contain copper alloys in instruments, cooling circuits, fittings, condensers, and specialised machinery.

Power Plants-Generators, auxiliary cooling systems, condensers, and heat-transfer equipment may contain both copper and ferrous metals. G-6 can help protect copper surfaces in an approved multimetal treatment programme.

Metalworking Operations-Copper sheets, brass coils, machined fittings, and precision components may need protection during manufacturing, cleaning, temporary storage, or transport.

Automotive Coolants-Formulators may include G-6 in compatible coolant packages where copper, brass, solder, aluminium, steel, and cast iron share the same system.

Marine Equipment-Salt-bearing coastal air can affect copper fittings, brass components, decorative surfaces, and stored marine spares. Suitable protective treatments can help control tarnish and corrosion.

Industrial Cleaners-G-6 can enter approved acidic, alkaline, or detergent cleaning formulations when copper protection is required during washing.

Protective Coatings-The powder may be used in suitable lacquers, temporary waxes, and other coating systems designed for copper or brass.

Packaging and Storage-Formulators may incorporate G-6 into wrapping paper, boxboard, interleaving sheets, or other protective materials used around copper, brass, and silver items.

Technical Specifications of Copper Corrosion Inhibitor

Specification	Typical Information
Product name	G-6
Product category	Copper and yellow-metal corrosion inhibitor
Active chemistry	Benzotriazole
Physical form	Powder
Appearance	White to off-white
Main metals	Copper and copper-based alloys
Other compatible metals	Brass and silver
Protection mechanism	Insoluble copper-benzotriazole complex
Approximate film thickness	10–20 molecules
Assay	98–100%
Melting-point range	94–99°C
Water solubility at 25°C	Approximately 1.98% by weight
Water solubility at 60°C	Approximately 7.4% by weight
Methanol solubility at 25°C	Approximately 71.6%
Isopropanol solubility at 25°C	Approximately 53.9%
Ethylene-glycol solubility at 25°C	Approximately 150.7%
Typical liquid concentration	Approximately 0.1–2.0%
Formulation types	Aqueous and non-aqueous
Packaging	2.3 kg, 23 kg, and 45 kg fibre drums
Bulk supply	Available
Supply area	Doha and across Qatar

The figures above provide typical product information. Final performance depends on formulation chemistry, dosage, temperature, water quality, and application conditions.

Certifications, Standards and Compliance

The standards below may help laboratories and users assess copper corrosion, fluid quality, and manufacturing controls. They should not automatically be described as individual certification for every G-6 batch.

• ASTM D130 – Copper Strip Corrosion Test
• ASTM D1838 – Copper Corrosion in Liquefied Petroleum Gas
• ISO 9001 – Quality Management Systems
• ISO 14001 – Environmental Management Systems

Customers should request the latest Technical Data Sheet, Safety Data Sheet, Certificate of Analysis, and any project-specific test documents before final approval.

Why Choose G-6 from Nassguard?

• Available in Doha and across Qatar
• Developed specifically for copper protection
• Suitable for brass and copper alloys
• Can support silver protection
• Useful in cooling-water formulations
• Suitable for HVAC treatment products
• Can be added to industrial cleaners
• Suitable for coolants and functional fluids
• Useful in lacquers and wax coatings
• Can be incorporated into wrapping materials
• Helps reduce tarnish and staining
• Helps control copper oxidation
• Works at relatively low dosage
• Suitable for aqueous formulations
• Suitable for solvent-based formulations
• Industrial drum sizes available
• Bulk quantities can be arranged
• Technical documents can be provided
• Support available for quantity planning
• Delivery available throughout Qatar

Nassguard can assist customers with package selection, expected consumption, technical documents, and order planning.

Frequently Asked Questions

1. What is G-6?
G-6 is a benzotriazole powder used to protect copper and copper-containing alloys.

2. Which metals can G-6 protect?
It is mainly used for copper, brass, silver, and compatible copper alloys.

3. How does G-6 work?
It reacts with copper oxide and forms a thin insoluble protective complex.

4. Can G-6 be used in cooling towers?
Yes, it can form part of a compatible cooling-water treatment formulation.

5. Is it suitable for HVAC systems?
Yes, it may help protect copper and brass components in suitable HVAC circuits.

6. Can formulators add it to cleaners?
Yes, G-6 can enter compatible acidic, alkaline, and detergent cleaners.

7. Can it be used in coatings?
Yes, suitable lacquers, waxes, and temporary coatings may contain G-6.

8. Does G-6 dissolve in water?
It has limited room-temperature solubility, which increases as the water temperature rises.

9. What concentration is normally used?
Typical incorporation levels range from about 0.1% to 2.0%.

10. Can it help with galvanic corrosion?
Yes, complexing free copper ions may help reduce copper-related galvanic attack.

11. What packaging sizes are available?
G-6 is available in approximately 2.3 kg, 23 kg, and 45 kg fibre drums and in bulk.

12. Where can I buy G-6 in Qatar?
Nassguard supplies G-6 in Doha and throughout Qatar.

Conclusion

Copper and brass are durable materials, but water, salts, oxygen, cleaning chemicals, and industrial contamination can still damage their surfaces. Tarnish may affect appearance, while deeper corrosion can interfere with heat transfer, conductivity, and equipment reliability.

G-6 provides targeted protection through benzotriazole chemistry. It reacts with copper oxide and creates a microscopic but stable protective complex on the surface.

The product suits many formulations, including cooling-water treatments, automotive coolants, industrial cleaners, lubricants, coatings, waxes, metalworking fluids, and protective packaging materials.

Its ability to bind dissolved copper ions may also help limit galvanic problems in compatible systems containing several different metals.

Nassguard supplies G-6 in Qatar and Doha for cooling towers, HVAC installations, metalworking plants, industrial formulators, marine operations, power facilities, and oil and gas projects.