To judge the quality of epoxy boards, the core lies in "appearance + performance + certification + actual testing". Below are simple and operable judgment methods that combine intuitive observation and key verification:
- Surface Condition: High-quality epoxy boards have a flat and smooth surface, free of bubbles, cracks, scratches or stains, with uniform color (common natural color, yellow, etc., no off-color spots).
- Edges and Cutting: The cut edges show no delamination or powder loss, and the thickness is uniform (no unevenness when touched by hand; calipers can be used to measure tolerance for precision scenarios).
- Material Density: Under the same specifications, high-quality epoxy boards feel solid without looseness, and produce a crisp sound when tapped (inferior boards may sound dull with internal gaps).
- Insulation Performance: Simple tests can be conducted (e.g., measuring insulation resistance with a multimeter—high-quality boards have extremely high resistance and no conductivity); for professional scenarios, check test reports to confirm a breakdown voltage of ≥35KV (for conventional applications).
- Mechanical Strength: Bend thin-spec boards moderately by hand—high-quality boards are not easy to break or deform significantly and can recover their shape after bending; for thick boards, check for brittle fracture risks.
- Temperature Resistance and Stability: Place the sample in an environment of about 80℃ for 1-2 hours. High-quality boards show no softening, discoloration or peculiar smell, and maintain performance after cooling (inferior boards may deform or become sticky).
- Certification Qualifications: Prioritize manufacturers certified by the ISO quality management system, and ensure products comply with industry standards (such as GB/T, IEC relevant standards).
- Test Reports: Request third-party test reports from manufacturers. Focus on verifying key parameters such as insulation resistance, breakdown voltage, mechanical strength and corrosion resistance to confirm data meets standards.
- Source Manufacturer: Direct-selling manufacturers can better control production links, with higher quality stability than intermediaries. Request production process descriptions if needed.
- Customer Feedback: Check user reviews for similar scenarios, focusing on keywords like "stable insulation", "anti-aging" and "precise dimensions". Avoid products with frequent quality complaints.
