EPGC 308 Epoxy Fiberglass Laminate Sheet (Detailed Description)

EPGC 308  Epoxy  Sheet Introduction EPGC 308 is a composite material manufactured through high-temperature and high-...

EPGC 308  Epoxy  Sheet Introduction

EPGC 308 is a composite material manufactured through high-temperature and high-pressure lamination processes using epoxy resin and fiberglass cloth. Its core characteristics include high mechanical strength, excellent electrical insulation, high-temperature resistance, chemical corrosion resistance, and dimensional stability. It is widely used in electronics, electrical engineering, mechanical manufacturing, aerospace, and other fields, particularly in harsh environments requiring long-term stability and reliability.

• Primary Components:
  • Matrix Material: Epoxy resin (modified for high-temperature resistance).
  • Reinforcement Material: Alkali-free fiberglass cloth (E-glass).
  • Additives: May include flame retardants (e.g., to meet UL94 V-0 standards), anti-aging agents, etc.
• Key Properties:
  • High mechanical strength (bending, compression, and impact resistance).
  • Superior dielectric properties and arc resistance.
  • Broad operating temperature range (-50°C to +180°C, with short-term tolerance up to 200°C).
  • Low water absorption, resistance to moisture, and chemical solvents (e.g., oils, acids, alkalis)

 Typical Applications

EPGC 308 Epoxy Fiberglass Laminate Sheet  is extensively utilized in the following fields due to its exceptional performance:

Field	Application Scenarios
Electronics & Electrical	– Insulating barriers for high-voltage switchgear, busbar supports – Transformer/motor slot wedges, end-fixing components – PCB drilling pads, test fixtures
Mechanical Equipment	– Wear-resistant structural parts (e.g., gears, bearing bushings) – Guides and fixtures for automated equipment (requiring high dimensional stability)
Rail Transit	– Insulating components for trains/subways (e.g., pantograph insulation supports) – Circuit board substrates for signal control systems
New Energy	– Photovoltaic inverter insulation plates – Weather-resistant structural components for wind turbine control cabinets
Aerospace	– Lightweight structural components for airborne equipment (requiring flame retardancy and low-smoke toxicity compliance)

Common Specifications

EPGC 308 specifications are typically customized based on client requirements. Below are industry-standard parameters:

Parameter	Specification Range	Remarks
Thickness	0.5mm ~ 50mm	Common thicknesses: 1mm, 2mm, 3mm, 5mm, 10mm
Standard Sizes	1000mm × 2000mm, 1220mm × 2440mm	Customizable dimensions (mold fees may apply)
Color	Natural (beige/amber), white, black	White preferred for high-precision labeling
Surface Finish	Single/double-sided gloss, matte, textured (enhanced adhesion)	Glossy surface roughness: Ra ≤ 0.8μm
Special Features	Flame-retardant (UL94 V-0), UV-resistant, anti-static versions available	Confirm testing standards (e.g., IEC 60695)

Technical Parameters

Typical technical parameters are listed below (values may vary slightly by manufacturer):

Property Category	Test Standard	Typical Value	Unit	Remarks
Mechanical Properties
Flexural Strength	ASTM D790	≥400	MPa	Tested at 23°C
Tensile Strength	ASTM D638	≥300	MPa	Dominated by fiber orientation
Compressive Strength	ASTM D695	≥350	MPa
Electrical Properties
Dielectric Strength (perpendicular)	IEC 60243-1	≥20	kV/mm	1mm thickness, 50Hz AC
Volume Resistivity (20°C)	IEC 60093	≥1×10¹³	Ω·cm	Under normal conditions
Surface Resistivity	IEC 60093	≥1×10¹²	Ω	At 65% RH humidity
Thermal Properties
Continuous Operating Temp.	–	-50°C ~ +180°C	°C	Long-term deformation-free
Heat Deflection Temp. (1.8MPa)	ASTM D648	≥200	°C
Coefficient of Linear Expansion	ASTM E831	12~15	×10⁻⁶/°C	Parallel to fiber direction
Physicochemical Properties
Density	ASTM D792	1.8~2.0	g/cm³
Water Absorption (24h immersion)	ASTM D570	≤0.1%	%	In 23°C distilled water
Flammability	UL94	V-0 (optional)	–	Tested at 1.6mm thickness

Selection & Machining Guidelines

• Key Selection Criteria:
  • Prioritize thickness based on operating temperature and voltage (e.g., 10kV/35kV).
  • For high-frequency applications, focus on dielectric constant (ε_r≈4.5~5.5) and dissipation factor (tanδ≤0.02).
• Machining Tips:
  • Drilling/Cutting: Use carbide tools with low feed rates to minimize delamination.
  • Bonding: Clean surfaces with alcohol; epoxy or acrylic adhesives are recommended.
  • Avoid prolonged exposure to strong acids (e.g., concentrated sulfuric acid) or alkalis.

Comparisons & Alternative Materials

• Competitor Comparison:
  • FR-4 Epoxy Board: Lower cost but inferior temperature resistance (Tg≈130°C).
  • Polyimide Board: Higher temperature tolerance (>250°C) but costly and brittle.
• Alternatives:
  • For lower mechanical strength requirements, consider phenolic paper-based boards (e.g., FR-1) or polyester fiberglass boards (GPO-3).

ZTelec Group is a professional manufacturer of high-quality electrical insulation materials with more than 65 years of manufacturing experience. If you need more product information and quotes, please contact us.