Hello!Welcome to www.5pcb.com
    Add favourite     Site map
                            
sales@5pcb.com               FAQs              Sign in               Create account

Materials

Date:August 2011

 

Conducting layers are typically made of thin copper foil. Insulating layers dielectric are typically laminated together with epoxy resin prepreg. The board is typically coated with a solder mask that is green in color. Other colors that are normally available are blue, black, white and red. There are quite a few different dielectrics that can be chosen to provide different insulating values depending on the requirements of the circuit. Some of these dielectrics are polytetrafluoroethylene (Teflon), FR-4, FR-1, CEM-1 or CEM-3. Well known prepreg materials used in the PCB industry are FR-2 (Phenolic cotton paper), FR-3 (Cotton paper and epoxy), FR-4 (Woven glass and epoxy), FR-5 (Woven glass and epoxy), FR-6 (Matte glass and polyester), G-10 (Woven glass and epoxy), CEM-1 (Cotton paper and epoxy), CEM-2 (Cotton paper and epoxy), CEM-3 (Woven glass and epoxy), CEM-4 (Woven glass and epoxy), CEM-5 (Woven glass and polyester). Thermal expansion is an important consideration especially with ball grid array (BGA) and naked die technologies, and glass fiber offers the best dimensional stability.
FR-4 is by far the most common material used today. The board with copper on it is called "copper-clad laminate".
Copper foil thickness can be specified in ounces per square foot or micrometres. One ounce per square foot is 1.344 mils or 34 micrometres.

 

--This article excerpt from“Wikipedia”

 

 

【Back】

        Quote Online   Capability   The company           PCB knowledge  
           Rigid PCB
          SMD-Stencils
 

Capability
Quality Guarantee

Cases

  Factory  &   Contact us
Careers  &  Payments account
Terms   &  Privacy policy
            PCB knowledge
          Links
 

Copyright © D.M.Electronic International Limited       E-mail:sales@5pcb.com    Tel:+86-755-27269685    Fax:+86-755-27220690

PC board prototype | Quote Online | custom pcb boardspcb prototyping board | Mulitlayer printed circuit board | Mulitlayer prited wiring board | Rigid printed board
Flexible printed board | PCB Online | PCB prototypes |Turnkey PCBA