Heat-resistant labels—also known as high-temperature stickers, thermal-resistant labels, or UL-certified heatproof labels—are specially designed to withstand extreme temperatures without melting, peeling, fading, or deforming. They are commonly used in electronics, automotive, machinery, home appliances, aerospace, and industrial manufacturing.

This article explains what heat-resistant labels are, the materials used, how they work, their industrial applications, and why they are essential for high-temperature environments.

What Are Heat-Resistant Labels?

Heat-resistant labels are durable adhesive labels made from materials such as Polyimide (PI), PET high-temperature film, PVC heat-resistant vinyl, and flame-retardant silicone adhesives. These labels are designed to maintain adhesion and legibility even at temperatures up to 150°C–350°C, depending on the material.

Key Features of Heat-Resistant Labels

1. Excellent High-Temperature Resistance

Depending on the material, labels can withstand:

  • 120°C – 150°C (PET high-temperature labels)
  • 180°C – 260°C (UL-grade PET, heat-resistant PVC)
  • 300°C – 350°C (Polyimide PI labels for PCB/SMT)

These labels do not melt, shrink, bubble, or lose adhesion.

High-Temperature Resistant Labels

2. Strong Chemical Resistance

Heat-resistant labels are resistant to:

  • solvents
  • oils
  • acids & alkalis
  • cleaning agents
  • flux & solder chemicals

Ideal for industrial and electronic environments.

3. Flame Retardant Performance

Materials like UL94 V0 flame-retardant PET or silicone adhesives prevent fire spread and meet international safety standards.

4. Durable Adhesion

High-temperature adhesives maintain strong bonding on:

  • metal
  • glass
  • plastic
  • powder-coated surfaces
  • rough industrial materials

Even after long-term exposure to heat.

5. Resistant to Aging & UV Light

Perfect for:

  • outdoor equipment
  • automotive parts
  • high-heat machinery

Labels remain readable and intact for years.

Common Materials Used in Heat-Resistant Labels

1. Polyimide (PI) Labels

⭐⭐⭐⭐⭐ Best for Extreme Heat

  • Withstands 260–350°C
  • Ideal for SMT, PCB soldering processes
  • Highly durable and chemical-resistant

2. High-Temperature PET Labels

  • Withstands 120–180°C
  • More cost-effective than PI
  • Suitable for electronics, appliances, automotive

3. Flame-Retardant Silicone Adhesive Labels

  • Used in electronics & battery packs
  • Resistant to aging and high heat
  • Maintains strong adhesion on metal and rough surfaces

4. PVC Heat-Resistant Stickers

  • Withstand 90–120°C
  • Good for appliances & general use

Applications of Heat-Resistant Labels

1. Electronics Manufacturing (PCB, SMT)

✔ Polyimide labels survive soldering reflow
✔ Used for:

  • PCB barcodes
  • process tracking labels
  • electronic component identification
  • high-temperature warning labels

2. Automotive Industry

✔ Engine compartment labels
✔ Battery labels
✔ Sensor and cable identification
✔ Oil & heat-resistant automotive stickers

Withstand high temperatures and harsh chemicals.

3. Home Appliances

Used inside:

  • microwave ovens
  • refrigerators
  • air conditioners
  • electric heaters
  • kitchen appliances

Labels remain intact under heat, moisture, and oils.

4. Industrial Machinery & Equipment

For:

  • boilers
  • generators
  • compressors
  • heat exchangers
  • motor equipment

Provide warnings, instructions, tracking, and safety information.

5. LED Lighting & Power Equipment

High-temperature labels for:

  • LED modules
  • power supply units
  • transformers
  • high-voltage equipment

6. Aerospace & Aviation

Labels must withstand:

  • extreme temperature changes
  • pressure
  • vibration
  • chemicals

PI labels are commonly used in aircraft electronics.

Printing Options for Heat-Resistant Labels

1. Thermal Transfer Printing

✔ Most common method
✔ Suitable for PI / PET high-temperature materials
✔ High durability & scratch resistance

2. Silkscreen Printing

✔ Thick inks & ultra-durable
✔ Used for equipment & warning labels

3. UV Printing

✔ Full-color images
✔ High-definition graphics
✔ UV-resistant & long-lasting

Why Choose Our High-Temperature Label Solutions?

We provide:
✔ UL-certified heat-resistant materials
✔ PI / PET / silicone adhesive options
✔ Customized shapes, dies & sizes
✔ Industrial-grade thermal transfer printing
✔ OEM & bulk production
✔ Fast shipping for global customers

Perfect for electronics, automotive manufacturing, industrial factories, machinery suppliers, and OEM brands.

Heat-resistant labels play a critical role in ensuring safety, traceability, and durability in high-temperature environments. Whether for electronics (PCB/SMT), automotive engines, industrial machines, or home appliances, high-temperature labels offer unmatched performance and reliability.

If your business needs durable identification solutions for extreme conditions, high-temperature stickers / heat-resistant labels are the ideal choice.