Class B Fire Extinguisher Uses, Types, Price & Buying Guide Complete Safety Guide for Flammable Liquid Fires

Flammable liquid fires are among the most dangerous and fast-spreading fire hazards. Substances like petrol, diesel, oil, paint, and industrial chemicals can ignite instantly and spread rapidly across surfaces. Unlike solid fires, these fires don’t burn deeply they spread across the liquid surface, making them extremely risky and difficult to control.

A small mistake like using water can make the situation worse by spreading the burning liquid. That’s why having a Class B fire extinguisher is critical for both homes and businesses. It is specifically designed to tackle flammable liquid fires safely and effectively.

What is a Class B Fire?

A Class B fire involves flammable liquids or gases that ignite easily and burn on the surface.

Common Examples:

• Petrol and diesel
• Cooking oil and grease
• Paints and varnishes
• Alcohol and solvents
• Chemical liquids

Why Class B Fires Are Dangerous:

• Spread quickly across surfaces
• Can reignite easily
• Produce toxic fumes
• Risk of explosions

Types of Class B Fire Extinguishers

How to Use a Class B Fire Extinguisher (PASS Method)

Using a fire extinguisher correctly is just as important as having one. Follow the PASS method:

• P – Pull the safety pin
• A – Aim at the base of the fire (not flames)
• S – Squeeze the handle
• S – Sweep from side to side

Class B Fire Extinguisher Price in India (2026 Guide)