Benzalkonium chloride is one of the most widely used disinfectants in the world. It belongs to a group of chemicals known as quaternary ammonium compounds, which are highly effective at killing bacteria, fungi, and certain viruses. Because of its strong antimicrobial properties and relatively low odour, it is commonly used in cleaning products, disinfectants, hospital sanitizers, agricultural treatments, and water treatment solutions.
If you purchase 50% concentration benzalkonium chloride (BAC 50), it is important to understand that this is a highly concentrated chemical. It must be diluted before use in most applications. Proper dilution ensures that the disinfectant is effective, economical, and safe to handle.
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What Is Benzalkonium Chloride?
Benzalkonium chloride (BAC) is a cationic surfactant and disinfectant widely used in cleaning and sanitation products. Its chemical structure allows it to disrupt microbial cell membranes, leading to rapid destruction of bacteria and fungi.
BAC is commonly available in several concentrations including:
-
10% solution
-
25% solution
-
50% solution
-
80% solution
The 50% concentration is one of the most popular forms used in industry because it is cost-effective, easy to transport, and simple to dilute for different applications.
Typical applications include:
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Surface disinfectants
-
Hospital cleaning solutions
-
Mold and mildew removal
-
Agricultural sanitation
-
Algae control
-
Industrial cleaning
-
Water treatment systems
Because BAC 50 is concentrated, users typically dilute it to concentrations between 0.05% and 0.5% depending on the application.
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Why Dilution Is Important
Using benzalkonium chloride at the correct dilution is critical for several reasons.
Safety
Undiluted BAC 50 can cause:
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skin irritation
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eye irritation
-
surface damage
Diluting the chemical ensures it is safe for everyday cleaning tasks.
Effectiveness
More chemical does not necessarily mean better disinfecting power. Most disinfectant applications work best between 0.05% and 0.2% BAC concentration.
Cost Efficiency
Proper dilution allows you to create large volumes of disinfectant from a small amount of concentrate.
For example:
1 litre of BAC 50 can produce approximately 500 litres of 0.1% disinfectant solution.
This makes benzalkonium chloride one of the most economical disinfectants available.
If you are preparing disinfectant formulations, you can purchase BAC concentrate here:
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Benzalkonium Chloride 50% Dilution Chart
Below is a practical dilution guide for common cleaning solutions.
0.05% Solution (Light Disinfection)
For 1 litre:
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1 g BAC 50
-
999 ml water
For 10 litres:
-
10 g BAC 50
-
9.99 litres water
Typical uses:
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food preparation surfaces
-
light sanitation
-
routine cleaning
0.1% Solution (Standard Disinfection)
For 1 litre:
-
2 g BAC 50
-
998 ml water
For 5 litres:
-
10 g BAC 50
-
4.99 litres water
Typical uses:
-
kitchen countertops
-
bathroom surfaces
-
office desks
-
door handles
0.2% Solution (Heavy Disinfection)
For 1 litre:
-
4 g BAC 50
-
996 ml water
For 10 litres:
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40 g BAC 50
-
9.96 litres water
Typical uses:
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healthcare facilities
-
public sanitation
-
commercial cleaning
0.5% Solution (High Strength)
For 1 litre:
-
10 g BAC 50
-
990 ml water
Common uses:
-
mold removal
-
algae treatment
-
contaminated surfaces
Step-by-Step Guide to Diluting Benzalkonium Chloride
Step 1 – Wear Protective Equipment
Recommended PPE includes:
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nitrile gloves
-
safety goggles
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protective clothing
Although BAC is widely used, concentrated forms should be handled carefully.
Step 2 – Measure the Required Amount
Use accurate measuring equipment such as:
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digital scale
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measuring cylinder
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pipette
Example:
To prepare 5 litres of 0.1% disinfectant, measure:
10 g benzalkonium chloride 50
Step 3 – Add Water
Fill a clean container with the required amount of water.
Example:
For a 5-litre solution:
Add 4.99 litres of water.
Step 4 – Add BAC Slowly
Slowly add the benzalkonium chloride to the water while stirring.
Always add chemical to water, not water into concentrated chemical.
Step 5 – Mix Thoroughly
Stir until the solution becomes completely uniform.
Your disinfectant is now ready to use.
Practical Cleaning Solution Recipes
Here are several real-world formulations using BAC 50.
Surface Disinfectant Spray
Ingredients:
-
2 g benzalkonium chloride 50
-
1 litre distilled water
-
optional fragrance (1–2 ml)
Instructions:
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Add water to a spray bottle.
-
Add BAC concentrate.
-
Shake gently.
This produces a 0.1% disinfectant spray suitable for:
-
desks
-
door handles
-
worktops
-
public surfaces
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Floor Cleaning Solution
Ingredients:
-
20 g BAC 50
-
10 litres water
This produces a 0.1% disinfectant floor cleaner.
Ideal for:
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tile floors
-
commercial premises
-
warehouses
-
kitchens
Mold and Mildew Removal Solution
Ingredients:
-
10 g BAC 50
-
1 litre water
Produces a 0.5% mold treatment solution.
Instructions:
-
Spray directly on affected surface.
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Leave for 10–15 minutes.
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Wipe clean.
Benzalkonium Chloride for Algae Control
BAC is also widely used as an algaecide.
Example treatment:
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50 g BAC 50
-
100 litres water
This produces approximately 0.025% algae control solution.
Applications include:
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water tanks
-
fountains
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irrigation systems
-
ponds
Industrial Uses of Benzalkonium Chloride
BAC is widely used across many industries.
Healthcare
Hospitals use BAC solutions for:
-
disinfecting surfaces
-
sanitising equipment
-
antibacterial wipes
Agriculture
Farmers use benzalkonium chloride to disinfect:
-
greenhouse structures
-
irrigation pipes
-
plant trays
Typical dilution:
0.1–0.2% solution
Food Processing
BAC solutions help sanitise:
-
conveyor belts
-
packaging equipment
-
preparation areas
Water Treatment
BAC helps control:
-
algae growth
-
bacterial contamination
-
biofilm development
Storage and Shelf Life
To maintain stability:
-
store between 10–25°C
-
keep containers sealed
-
avoid direct sunlight
Shelf life is typically 2–3 years when stored properly.
Safety Guidelines
Although benzalkonium chloride is widely used in cleaning products, basic precautions should be followed.
Avoid:
-
direct skin contact with concentrate
-
inhaling spray mist
-
mixing with incompatible detergents
Store chemicals:
-
away from children
-
in labelled containers
-
in cool dry conditions
If exposure occurs:
-
rinse skin with water
-
flush eyes for 15 minutes
Where to Buy Benzalkonium Chloride UK Online
If you are looking for high-quality disinfectant chemicals, you can purchase directly from our UK chemical supplier.
Buy here:
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Our store provides:
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-
reliable UK shipping
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secure packaging
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Frequently Asked Questions
1. What concentration of benzalkonium chloride is used for disinfecting?
Most disinfectant solutions use 0.05% to 0.2% BAC concentration.
2. How do I dilute benzalkonium chloride 50% to 0.1%?
Mix:
-
2 g BAC 50
-
998 ml water
to make 1 litre of disinfectant solution.
3. Can benzalkonium chloride kill viruses?
Yes. BAC is effective against many bacteria, fungi, and enveloped viruses.
4. Is benzalkonium chloride safer than bleach?
BAC generally produces less odour and is less corrosive, though both chemicals must be handled carefully.
5. Can BAC remove mold?
Yes. A 0.5% solution is commonly used for mold and mildew treatment.
6. Can benzalkonium chloride be mixed with soap?
It should not be mixed with anionic detergents, as they reduce its disinfectant effectiveness.
7. How long does diluted BAC solution last?
Properly stored solutions can remain stable for several weeks to months.
8. Can BAC be used on food preparation surfaces?
Yes, but surfaces should be rinsed with clean water after disinfection.
9. How much disinfectant can be made from 1 litre of BAC 50?
Approximately 500 litres of 0.1% disinfectant solution.
10. Where can I buy benzalkonium chloride in the UK?
You can buy it directly here:
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Chemical Specification – Benzalkonium Chloride (BAC 50)
Product Name: Benzalkonium Chloride 50% Solution
Chemical Type: Quaternary Ammonium Compound (Cationic Surfactant)
CAS Number: 8001-54-5 / 63449-41-2
EC Number: 264-151-6
Molecular Formula: C₆H₅CH₂N(CH₃)₂RCl (mixture of alkylbenzyldimethylammonium chlorides)
Active Content: 50 ± 1 %
Appearance: Clear to pale yellow liquid
Odour: Mild characteristic odour
pH (10% solution): 6.0 – 8.0
Solubility: Completely soluble in water and alcohol
Density: ~0.96 – 1.00 g/cm³ (at 20°C)