Fiber Glass Single / Doble Side Copper Clad Foil Circuit Boards PCB FR-4 Boards. FR-4 Is the Abbreviation of Glass Fibre Epoxy Resin Copper-clad Laminate, Which Is a Class of Flame-retardant Substrate with Epoxy Resin As the Binder and Electronic-grade Glass Fibre Cloth As the Reinforcing Material. Fr-4 Sheet Has High Strength, Good Heat Resistance, Good Dielectric Properties, Through-hole Can Be Metallised Features, to Achieve the Double-sided and Multi-layer Circuit Boards Between the Conductive Layer of Electrical Conduction, so It Is All the Copper-clad Plate in the Most Widely Used, the Largest Amount of a Class. Wide Range of Uses. Mainly Used in the Manufacture of Printed Circuit Boards for Electronic Components to Play a Role in Supporting and Connecting with Each Other, Insulating Each Other, Known As the Printed Circuit Board of the Important Basic Materials. It Is All Electronic Machine, Including Aviation, Aerospace, Remote Sensing, Telemetry, Remote Control, Communications, Computers, Industrial Control, Household Appliances, and Even Advanced Children’s Toys and so on All Electronic Products, Are Indispensable to the Important Electronic Materials. The Pictures Are for Reference Only, and the Size, Color and Printing Are Subject to the Actual. Fiber Glass Copper Clad Foil Circuit Boards. Single / Double Sided. If You Need a Large Quantity or Other Quantity, We Can Send the Goods According to Your Requirements. Thank You Very Much. If You Need Other Sizes, We Can Offer Customization. Please Contact Our Customer Service for Details. As per Your Choice! It’s Quick, Easy, and Safe. Please List Your Special Requests Color, Packages, Etc. We Sincerely Hope That You Can Receive the Goods As Soon As Possible. For the Functional Products in Our Store, We Make Sure the Functions Are the Same As Description. But the Actual Color and Shape May Be a Little Different from the Pictures Due to the Technical Improvement and Manufacturing Variance. We Care About Our Valued Buyers, If You Have Any Questions Our Customer Service Representatives Will Be Very Happy to Help You. We Try Our Best to Answer Your Emails As Soon As Possible. However, Due to the High Number of Emails We Receive Every Day and the Time Zone Difference, We May Not Be Able to Reply to Your Emails Immediately.