Mixed LPG is a carefully controlled blend of propane (C₃H₈) and butane (C₄H₁₀) designed to deliver optimal vapor pressure, stable combustion, and high energy output across varying climatic and operational conditions.
By adjusting the propane–butane ratio, Mixed LPG ensures reliable performance year-round, making it the most widely used LPG type for households, hotels, factories, centralized gas systems, and automotive applications.
Chemical Composition & Blending Strategy
Primary Components
Propane (C₃H₈)
Butane (C₄H₁₀)
Typical Blending Ratios
Propane-rich mix (60–80% Propane): Cold climates and high vapor demand
Balanced mix (50:50): General domestic and commercial use
Butane-rich mix (60–80% Butane): Warm climates and indoor kitchens
Impurities:
* Sulfur, moisture, olefins maintained at trace levels
* Odorized with ethyl mercaptan for safetys.
Blending is performed under strict quality control to meet regional safety and performance standards.
Key Characteristics of Mixed LPG
Optimized Vapor Pressure & All-Season Reliability
* Propane ensures vaporization in cold conditions
* Butane increases calorific output and efficiency
* Maintains stable gas flow across seasons
High Energy Output & Thermal Efficiency
* Calorific value: 46–50 MJ/kg
* Instant ignition and high flame temperature
* Efficient heat transfer with minimal fuel wastage
Ideal for continuous heating and high-load industrial processes.
This balance prevents pressure drop, flame instability, and incomplete combustion.
Clean, Low-Emission Fuel
* Negligible soot and smoke
* Very low SOₓ and particulate matter
* Reduced CO₂ emissions compared to diesel, kerosene, or coal
Suitable for food, pharmaceutical, textile, and hospitality sectors.
Safe, Portable & Easy to Handle
* Stored as liquid under moderate pressure
* Cylinders and tanks designed with:
* Pressure relief valves
* Excess flow valves
* Odorized for leak detection
* Non-corrosive to storage and piping systems
Flexible Storage & Distribution
* Available in cylinders, bulk tanks, and centralized gas networks
* Easy to transport and refill
* Suitable for both urban and remote locations
Typical Mechanical & Technical Properties
| Property | Description / Value |
|---|---|
| Composition | Propane + Butane blend |
| Boiling Point | Propane: –42°C / Butane: –0.5°C |
| Vapor Pressure @ 20°C | 2 – 8 bar (mix dependent) |
| Liquid Density | 0.50 – 0.58 kg/L |
| Vapor Density | 1.5 – 2.0 times heavier than air |
| Flammability Range | 2% – 10% in air |
| Auto-Ignition Temperature | ~480 – 500°C |
| Flame Temperature | ~1,980°C |
| Calorific Value | 46 – 50 MJ/kg |
| Appearance | Colorless, odorized |
Storage, Supply & Packaging Options
Cylinders
Domestic: 12 kg / 14.2 kg
Commercial: 17 kg / 19 kg / 33 kg
Industrial: 47 kg / 425 kg
Bulk LPG Supply
* Delivered via LPG tankers
* Stored in:
* Above-ground tanks
* Underground tanks
* Ideal for:
* Hotels
* Factories
* Hospitals
* Centralized gas networks
Custom Composition Blends
Propane-rich LPG for cold regions
Butane-rich LPG for tropical climates
* Tailor-made blends for:
* Industrial burners
* Kilns
* Automotive autogas systems
Applications of Mixed LPG
Domestic Use
* Cooking,
* water heaters,
* space heaters,
* emergency backup fuel
Commercial Sector
* Hotels & restaurants,
* central kitchens,
* bakeries,
* catering units,
* laundry systems
Industrial Applications
* Boilers,
* furnaces,
* metal cutting and brazing,
* ceramic and glass kilns,
* textile drying,
* paper processing,
* spray drying(food & chemicals)
,
* Asphalt heating and road construction
Automotive (Auto-Gas)
* LPG-powered cars and taxis
* Fleet vehicles
* Lower fuel cost and emissions compared to petrol
Agriculture
* Crop and grain drying
* Greenhouse heating
* Pest control fumigation
Comparison: Mixed LPG vs Propane vs Butane
| Parameter | Mixed LPG | Propane | Butane |
|---|---|---|---|
| Climate Suitability | All climates | Cold climates | Warm climates |
| Storage Pressure | Moderate | Higher | Lower |
| Energy Output | High | High | Very high (vol.) |
| Cost | Balanced | Higher | Lower |
| Flexibility | Excellent | Limited | Limited |
Advantages Summary
✔ All-season performance
✔ Adjustable composition
✔ Clean and efficient combustion
✔ Easy storage and transport
✔ Cost-effective fuel choice
✔ Suitable for domestic, commercial, and industrial use
Mixed LPG is the most versatile and widely adopted LPG fuel, offering the perfect balance between performance, safety, efficiency, and cost. Its adaptable composition ensures consistent operation across climates and applications, making it the preferred energy choice for households, hospitality, industries, transportation, and agriculture.