It detects the presence of LPG, Isobutane, and Propane gas at concentrations from 100 ppm to 10,000 ppm, a range suitable for detecting gas leaks.

High Sensitivity to LPG, iso-butane, propane
Small sensitivity to alcohol, smoke
Good sensitivity to Combustible gas in wide range
High sensitivity to Propane, Butane, LPG and also response to Natural gas
Long life and low cost
Simple drive circuit

Specification of MQ6 LPG GAS Sensor:-
Detection Range: 100 - 10,000 ppm iso-butane propane
Fast Response Time: <10s
Simple drive circuit
Heater Voltage: 5.0V
Dimensions: 18mm Diameter, 17mm High excluding pins, Pins - 6mm High 

Applications of MQ6 LPG Gas Sensor:- 
Gas leak detection system
Fire/Safety detection system
Domestic gas leakage detector
Industrial Combustible gas detector
Portable gas detector
Gas leak alarm
Gas detector