What are the two major categories of PCB board materials?
October 9, 2019 at 7:11 am #1631849
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In recent years, with the continuous advancement and innovation of electronic technology. It also promotes the development of PCB circuit boards. Not only is the process requirements for the precision and number of layers of printed PCB substrates higher and higher, but also the PCB substrate materials are constantly demanding higher requirements. Below LHD Technology introduces “what are PCB circuit board materials”.
Generally, the substrate materials for printed boards can be divided into two categories:
Rigid substrate material and flexible substrate material. An important variety of rigid substrate materials is copper clad laminates. It is made of Reinforcing Material, impregnated with resin adhesive, dried, cut, laminated, and then coated with copper foil, using steel plate as a mold, and processed by high temperature and high pressure forming in a hot press. Into. A prep reg for a general multi layer board is a semi-finished product of a copper clad laminate (mostly a glass cloth impregnated with a resin and dried).
1. Classification of copper clad laminates:
There are many ways to classify copper clad laminates. Generally, according to different reinforcing materials of the board, it can be divided into five categories: paper base, glass fiber cloth base, composite base (CEM series), laminated multi-layer board base and special material base (ceramic, metal core base, etc.). If the classification is based on the resin adhesive used in the board, the common paper-based CCI. There are various types of phenol resins (XPc, Xxx PC, FR-1, FR-2, etc.), epoxy resins (FE-3), and polyester resins.
Common glass fiber cloth based CCL has epoxy resin (FR-4, FR-5), which is currently the most widely used type of fiberglass cloth. In addition, there are other special resins (glass fiber cloth, poly amide fiber, non-woven fabric, etc.): bismaleimide modified triazine resin (BT), polyimide resin (PI), diphenylene ether resin (PPO), malefic anhydrous imine – styrene resin (MS), polycyanate resin, polyolefin resin, and the like.
2. According to the flame retardant properties of CCL:
It can be divided into two types: flame retardant type (UL94-VO, UL94-V1 grade) and non-flame retardant type (UL94-HB grade). In recent years, with the emphasis on environmental protection issues, a new type of CCL that does not contain bromine in flame retardant CCL can be called “green flame retardant CCL”. With the rapid development of electronic product technology, there are higher performance requirements for CCL. Therefore, from the performance classification of CCL, it is divided into general performance CCL, low dielectric constant CCL, high heat resistance CCL (normal board L is above 150 °C), low thermal expansion coefficient CCL (usually used on package substrates) and other types.
The above is the introduction of PCB substrate material. The PCB board printing process and the selection of PCB board substrate materials can directly affect the final quality and application of PCB. This is also an important factor in the selection of PCB materials in electronics, electrical appliances and other major industries.
Since 2005, LHD Technology has become a global leader in the manufacture of printed circuit boards (PCB). Our printed circuit boards are manufactured with high precision and have earned the company’s high reputation for consistent quality, on-time delivery and excellent service.
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