Question 1: Which grade is best for high-frequency PCBs?
Answer: For high-performance PCBs, FR4 is typically the preferred material due to its proven flame retardancy and electrical insulation properties. For applications requiring even better dimensional stability or lower moisture absorption, G11 or specialized EPGC grades may be recommended.

Question 2: How do G9, G10, G11, FR4 and EPGC differ？
Answer:

1. G10 vs. FR4: FR4 is flame-retardant (contains bromine); G10 is not.

2. G11 vs. G10: G11 offers higher thermal resistance (Tg ~180°C vs. 130°C).

3. EPGC vs. FR4: EPGC may use non-brominated resins for eco-compliance.

4. G9: Obsolete in most industries due to limited thermal performance.

Question 3:Are halogen-free options available?
Answer: Yes, EPGC or halogen-free FR4 variants meet ROHS/REACH standards.

Question 4: What’s the price difference between G10 and FR4?
Answer: FR4 costs ~10–15% more due to flame-retardant additives.

Question 5: Is G11 suitable for food-grade applications?
Answer: No—use FDA-compliant resins or separate food-safe coatings.

Question 6: Can epoxy glass sheets be bonded with adhesives?
Answer: Yes, epoxy-based adhesives work best. Surface roughening improves adhesion.

Question 7: How to cut epoxy glass sheets without chipping?
Answer: Use carbide-tipped blades and low feed speeds. Laser cutting is also effective.

Question 8: What does EPGC mean?
Answer: EPGC stands for Epoxy Glass Cloth laminate composite. It is similar to FR4 in composition but may be engineered with different resin formulations or manufacturing processes to enhance specific properties such as electrical performance or moisture resistance.

Question 9: Are these materials safe for use in high-humidity environments?
Answer: When properly manufactured (especially grades like FR4 with low moisture absorption), epoxy glass laminates perform well even in high-humidity environments. However, extended exposure to moisture without proper storage or sealing could affect their properties.