Is fiberglass insulation flammable

I. The Nature of FR4 Epoxy Sheet: A Perfect Fusion of Glass Fiber and Epoxy Resin

FR4 epoxy sheet is a high-performance insulating material composed of woven glass fiber cloth and epoxy resin. Its core properties include:

• Glass Fiber Reinforcement Layer:

Utilizes E-glass fiber (low alkali content) with a melting point exceeding 1000°C, inherently non-combustible and acting as a natural fire barrier.

• Epoxy Resin Matrix:

Employs flame-retardant epoxy resin formulated for self-extinguishing properties. Upon exposure to flames, it carbonizes instead of burning.

II. Fire Performance: Data and Certifications

1. Flammability Testing:
   • UL94 Fire Rating: Achieves V-0 certification (highest flame-retardant class), with no dripping after ignition and flames self-extinguishing within 10 seconds.
   • Oxygen Index (LOI): ≥28%, meaning combustion is only possible in high-oxygen environments.
2. High-Temperature Stability:
   • Long-Term Operating Temperature: 130–150°C (depending on resin type).
   • Short-Term Tolerance: Up to 300°C with no decomposition or combustion risks.

III. Why FR4 Epoxy Sheet is Called the "Fire-Resistant Pioneer"?

1. Safety in Electronics:
   • Used in electrical insulation components (transformers, relays, etc.) to prevent arcing-induced fires.
2. Industrial Fire Barriers:
   • Acts as insulating structural support for mechanical parts in high-temperature environments, preventing short circuits and metal-induced fires.
3. Compliance with Strict Standards:
   • Meets international certifications (IEC 61249-2-4, IPC-4101) for fire safety in industries like electronics, automotive, and aerospace.

IV. Practical application scenarios of FR4 epoxy sheet

V. Clarification of Common Misconceptions
· Misconception 1: “Epoxy resin is flammable, making FR4 epoxy sheet unsafe.”
Fact: FR4 uses flame-retardant epoxy resin. When exposed to fire, it only undergoes surface carbonization (no molten dripping) and exhibits extremely low flame propagation rates.

· Misconception 2: “Fiberglass insulation releases harmful substances when burned.”
Fact: Fiberglass is an inorganic material and releases no toxic gases during combustion (unlike halogen-containing organic materials).

VI. Three Key Reasons to Choose FR4 Epoxy Sheet

Outstanding Fire Resistance:

V-0 flame retardant rating (self-extinguishing upon flame removal).

Minimizes fire hazards to protect lives and property.

Superior Comprehensive Performance:

High strength, excellent electrical insulation, and chemical corrosion resistance.

Ideal for harsh environments (e.g., high temperatures, humidity).

Eco-Friendly and Safe:

Halogen-free formulation compliant with RoHS standards.

No carcinogenic risks, ensuring long-term safety.

With the widespread use of electronic devices, FR4 epoxy sheet have become a safety benchmark in insulation materials, leveraging the synergistic fire-resistant properties of fiberglass and epoxy resin. Whether in household appliances, automotive electronics, or industrial equipment, choosing FR4 epoxy sheet is a proactive defense against fire risks.

Safety begins with the right materials!