Fr4 Fiberglass Sheet
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Introduction:Fr4 Fiberglass Sheet is a composite material with glass fiber cloth as reinforcement material and epoxy resin as matrix.
Product Description
Fr4 Fiberglass Sheet is a composite material with glass fiber cloth as reinforcement material and epoxy resin as matrix. It meets the UL94 V-0 flame retardant standard and has excellent electrical insulation, mechanical strength and heat resistance. As the most commonly used substrate material in the electronics industry, FR4 is widely used in printed circuit boards (PCBs), motor insulation parts and precision testing equipment.
Parameters:
| Indicator Name | Unit | Indicator Value | |
| Density | g/cm³ | 1.8–2.0 | |
| Water absorption | % | ≤ 0.5 | |
| Vertical layer bending strength | MPa | ≥ 340 | |
| Vertical layer compression strength | MPa | ≥ 350 | |
| Parallel layer impact strength (simple beam method notch) | K J/m² | ≥ 37 | |
| Parallel layer shear strength | MPa | ≥ 34 | |
| Tensile strength | MPa | ≥ 300 | |
| Vertical layer direction electric strength (90 ℃± 2 ℃ in oil) | 1mm | KV/mm | ≥ 14.2 |
| 2mm | ≥ 11.8 | ||
| 3mm | ≥ 10.2 | ||
| Parallel layer direction breakdown voltage (90 ℃± 2 ℃ in oil) | KV | ≥ 40 | |
| Dielectric loss factor (50 Hz) | – | ≤ 0.04 | |
| Insulation resistance | Normality | Ω | ≥ 5.0 × 1012 |
| After immersed in water for 24h | ≥ 5.0 × 1010 | ||
| Flammability (UL-94) | Rating | V-0 | |
Product Features
1. Glass fiber substrate
E-grade glass fiber cloth is used, impregnated with epoxy resin after weaving, and made by high temperature and high pressure lamination process. The tensile strength of glass fiber reaches 6.3-6.9 g/d, and it still maintains 5.4-5.8 g/d in wet state, ensuring the stability of the mechanical properties of the material in a humid environment.
2. Resin matrix
Using modified epoxy resin, the hardness reaches Shaw D80-90 after curing, and the temperature range is -50℃ to 130℃, which meets the long-term operation requirements of electronic equipment.
3. Hot pressing molding
Multi-layer glass fiber cloth and resin are alternately stacked, the interlayer bonding force is ≥20 MPa, the total thickness range is 0.1-200mm, and the standard board size is 1020×1220mm and 1220×2440mm.
4. Insulation
Volume resistivity>1×10¹⁵ Ω·cm, dielectric strength ≥20 kV/mm, suitable for high-voltage electrical cabinets and transformer insulation parts.
5. High strength and lightweight
Density 1.8-2.1 g/cm³, only 1/4 of steel, bending strength of 300-500 MPa, impact toughness increased by more than 3 times, suitable for weight-sensitive and high-strength scenes.
6. Corrosion resistance
Passed ASTM B117 salt spray test, no corrosion after immersion in 5% NaCl solution for 1000 hours, suitable for corrosive environments such as chemical and marine.
7. Flame retardancy
Complies with UL94 V-0 standard, self-extinguishing time from fire <10 seconds, smoke density ≤75, meeting the fire protection requirements in rail transit, construction and other fields.
Application scenarios
1. Electronics industry
PCB substrate: As the substrate of printed circuit boards, it supports the stable operation of electronic equipment and is suitable for computers, consumer electronics, communication equipment, etc.
Insulating structural parts: used as insulating structural parts in motors and electrical equipment, and are also widely used in PCB testing, and can be used in humid environmental conditions and transformer oil.
2. Automobile industry
High temperature resistant parts: used to manufacture high temperature and impact resistant automotive parts, such as engine control units, sensor insulation parts, etc.
3. Aerospace
Lightweight structural parts: Due to their light weight and high strength characteristics, they are used in structural parts of aircraft and spacecraft, such as control panels, electronic equipment partitions, etc.
4. Precision testing equipment
Test plates: suitable for precision test plates, insulation brace partitions of electrical (electrical) equipment, insulation pads, etc., to ensure the accuracy and stability of the test.
5. Transformer and motor insulation
Insulation parts: used for transformer insulation boards, motor insulation parts, etc., to provide reliable electrical insulation and mechanical support.
Cleaning and maintenance guide
1.Daily cleaning
Surface stains: wipe with neutral detergent (pH 6-8), avoid chlorine or strong acid solvents.
Oil stain treatment: wipe with isopropyl alcohol and rinse with clean water to avoid residual solvents corroding the resin.
Glue mark removal: soften with frozen spray and remove with a plastic scraper to avoid scratching the surface.
2.Long-term storage
Environmental requirements: temperature 15-25℃, humidity ≤60%, avoid direct ultraviolet rays.
Packing method: vacuum aluminum foil bag packaging, built-in desiccant, stacking height ≤1.5m to prevent deformation.
3.Repair and renovation
Surface scratches: after polishing with 2000 grit sandpaper, spray with polyurethane paint of the same color to restore the appearance and weather resistance.
Interlayer debonding: local heating to 10℃ above the glass transition temperature (Tg) of the resin, inject the same type of resin for curing.