What is the Difference Between AR-AFFF and AFFF Foam?
When it comes to firefighting, understanding the differences between various types of foam can be crucial. Two commonly used foams are AR-AFFF (Aqueous Film-Forming Foam) and AFFF (Aqueous Film-Forming Foam). While they share a similar name and purpose, there are several key distinctions that set them apart. Let’s delve into the details to help you understand the differences between AR-AFFF and AFFF foam.
Chemical Composition
One of the primary differences between AR-AFFF and AFFF foam lies in their chemical composition. AFFF foam is made up of a mixture of surfactants, solvents, and water. These surfactants help to create a film on the surface of the water, which prevents the fire from reigniting. On the other hand, AR-AFFF foam contains additional chemicals that make it more effective against flammable liquids, such as jet fuels and oils.
AR-AFFF foam typically contains a fluorosurfactant, which enhances its ability to form a stable film on the water’s surface. This film is crucial in preventing the fire from spreading and allowing the foam to smother the flames. The fluorosurfactant also helps to improve the foam’s stability and longevity, making it more effective in extinguishing fires.
Firefighting Performance
When it comes to firefighting performance, AR-AFFF foam generally outperforms AFFF foam. This is due to its enhanced chemical composition, which allows it to create a more effective film on the water’s surface. The film formed by AR-AFFF foam is more resistant to breaking down, which means it can maintain its effectiveness for a longer period of time.
Additionally, AR-AFFF foam is more effective against a wider range of flammable liquids. While AFFF foam is primarily designed for Class B fires (flammable liquids), AR-AFFF foam can also be used to extinguish Class A fires (solid materials) and Class C fires (electrical fires). This versatility makes AR-AFFF foam a more versatile option for firefighters.
Environmental Impact
Another important consideration when comparing AR-AFFF and AFFF foam is their environmental impact. Both types of foam can be harmful to the environment if not used properly. However, AR-AFFF foam is generally considered to have a lower environmental impact than AFFF foam.
AR-AFFF foam contains fewer harmful chemicals than AFFF foam, which means it is less likely to contaminate water sources and harm aquatic life. Additionally, AR-AFFF foam breaks down more quickly than AFFF foam, which reduces the risk of long-term environmental damage.
Application and Use
When it comes to application and use, both AR-AFFF and AFFF foam are designed to be used in the same way. They are typically applied using foam proportioners, which mix the foam concentrate with water to create the desired foam concentration. The foam is then discharged onto the fire, where it forms a film on the water’s surface to extinguish the flames.
However, due to its enhanced performance and environmental benefits, AR-AFFF foam is often preferred over AFFF foam in situations where the risk of flammable liquid fires is high. This includes airports, refineries, and other industrial settings where flammable liquids are present.
Cost and Availability
Another factor to consider when comparing AR-AFFF and AFFF foam is cost and availability. AFFF foam is generally more affordable and widely available, making it a popular choice for many firefighters and fire departments. However, AR-AFFF foam is also becoming more accessible and is often preferred for its superior performance and environmental benefits.
The cost of AR-AFFF foam may be higher than AFFF foam, but the long-term benefits, such as reduced environmental impact and improved firefighting performance, can make it a worthwhile investment.
Conclusion
In conclusion, while AR-AFFF and AFFF foam share a similar name and purpose, there are several key differences that set them apart. AR-AFFF foam offers enhanced performance, a lower environmental impact, and versatility in extinguishing a wider range of fires. However, it is important to consider the specific needs of your situation and the availability of both types of foam when making a decision.
