Propylene glycol (PG)
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Propylene Glycol (PG): What It Is & How It Works in E-Liquid Mixing

Propylene Glycol (PG) is a common base ingredient used in e-liquid formulation and DIY vape mixing. It is a clear, odourless liquid that is widely used as a carrier for flavourings and nicotine in vape juice recipes.

This guide explains what PG is, how it functions in e-liquid mixing, its key properties, and how it compares to other base ingredients used in DIY vape formulations.

What Is Propylene Glycol (PG)?

Propylene Glycol is a synthetic liquid compound commonly used as a base ingredient in e-liquids. It is known for its thin consistency and ability to carry flavour effectively.

In vape formulations, PG is typically used for:

  • Carrying flavour concentrates
  • Delivering nicotine in DIY e-liquids
  • Adjusting e-liquid viscosity
  • Balancing VG/PG ratios in mixing

PG is one of the two primary base ingredients used in most vape liquids, alongside Vegetable Glycerin (VG).

How Propylene Glycol Works in E-Liquid

PG functions as a carrier fluid in vape formulations. It helps dissolve flavour concentrates and nicotine, allowing them to be evenly distributed throughout the e-liquid.

Basic process:

  1. PG is combined with flavour concentrates
  2. Nicotine (if used) is added to the mixture
  3. The solution is blended with VG (if required)
  4. The final mixture is shaken thoroughly
  5. The e-liquid is then ready for use or steeping

PG plays a key role in ensuring flavour consistency and liquid stability.

Key Properties of Propylene Glycol

PG has several characteristics that make it widely used in e-liquid mixing.

1. Thin Consistency

PG is a low-viscosity liquid, meaning it is much thinner than VG.

Result:

  • Easier mixing with flavour concentrates
  • Better flow in smaller coil systems
  • Suitable for low-wattage devices

2. Flavour Carrier

PG is highly effective at carrying flavour molecules.

Result:

  • Stronger flavour delivery
  • Clearer taste profile
  • Enhanced flavour definition in mixes

3. Throat Hit Sensation

PG contributes to the “throat hit” sensation in e-liquids.

Result:

  • Sharper inhale feel compared to VG
  • More cigarette-like sensation in some formulations

4. Low Vapour Production

Compared to VG, PG produces less visible vapour.

Result:

  • Reduced cloud production
  • More discreet vaping experience
  • Suitable for flavour-focused blends

PG vs VG in E-Liquid Mixing

PG and VG are typically used together in different ratios depending on the desired result.

Propylene Glycol (PG):

  • Thin consistency
  • Strong flavour delivery
  • Higher throat hit
  • Lower vapour production

Vegetable Glycerin (VG):

  • Thick consistency
  • Smoother inhale
  • Larger vapour clouds
  • Milder flavour impact

Common PG/VG Ratios

Different ratios are used depending on device type and mixing preference.

50/50 Blend:

  • Balanced flavour and vapour
  • Suitable for pod systems and MTL devices

High PG (e.g., 70/30 PG/VG):

  • Strong flavour focus
  • Thinner liquid consistency
  • Used in some compact systems

High VG (low PG content):

  • Larger vapour production
  • Smoother inhale
  • Used in sub-ohm devices

Device Compatibility

PG-based or PG-heavy e-liquids are commonly used in:

  • Pod systems
  • Mouth-to-lung (MTL) devices
  • Low-wattage vape kits
  • Starter devices

Its thin consistency makes it suitable for smaller coil systems that require efficient wicking.

Storage & Handling

Proper storage helps maintain PG quality:

  • Store in a cool, dry place
  • Keep container tightly sealed
  • Avoid direct sunlight and heat
  • Store away from contaminants or foreign substances

Safety & Usage Considerations

When working with Propylene Glycol:

  • Use in a clean mixing environment
  • Avoid direct ingestion of raw materials
  • Handle with clean tools and containers
  • Keep away from children and pets
  • Follow general DIY mixing safety practices

Considerations Before Using PG in DIY Mixing

When working with PG in e-liquid formulation, users typically consider:

  • Desired VG/PG ratio
  • Device type compatibility
  • Flavour strength requirements
  • Throat hit preference
  • Coil type and resistance
  • Mixing experience level

Final Thoughts on Propylene Glycol (PG)

Propylene Glycol is a key base ingredient in e-liquid formulation and DIY vape mixing. Known for its thin consistency and strong flavour-carrying ability, it plays an essential role in balancing VG/PG ratios and shaping the overall vaping experience.

Understanding how PG works, how it compares to VG, and how it affects flavour and performance helps create more consistent and controlled e-liquid formulations.