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Special Material PCB Characteristics

Shenzhen Inno Circuit Co.,Ltd | Updated: Jul 04, 2017

Special materials PCB substrate material can be divided into two categories: rigid substrate materials and flexible substrate materials. Ordinary rigid substrate material is an important varieties of CCL. It is reinforced with a material (Reinforeing Material), impregnated with resin adhesive, through drying, cutting, laminated into a blank, and then covered with copper foil, with steel as a mold, Special Material PCB in the hot press by high temperature and high pressure forming process Into the. General multi-layer board with the semi-cured film, it is CCL in the production process of semi-finished products (mostly glass cloth impregnated with resin, made by drying).

Special materials PCB classification methods are available. (CEM series), laminated multilayer board base and special material base (ceramic, metal core base, etc.) are divided into five categories: paper base, glass fiber cloth base, composite base (CEM series) If the resin used by the board of different classification, Special Material PCB the common paper-based CCI. There are various types such as phenolic resin (XPc, XxxPC, FR-1, FR-2, etc.), epoxy resin (FE-3), polyester resin and the like. Common glass fiber cloth CCL has epoxy resin (FR-4, FR-5), it is the most widely used glass fiber cloth type. In addition, there are other special resins (glass fiber cloth, polyamide fiber, non-woven fabrics to increase the material): bismaleimide modified triazine resin (BT), polyimide resin (PI) , Special Material PCB Diphenylene ether resin (PPO), maleic anhydride imide-styrene resin (MS), polycyanoate resin, polyolefin resin, and the like.

According to CCL flame retardant performance classification, can be divided into flame retardant (UL94 a VO, UL94 a V1 level) and non-flame retardant (UL94 a HB class) two types of boards. Nearly two years, Special Material PCB with the environmental issues more attention, in the flame retardant CCL is divided into a new non-brominated species of CCL varieties, can be called "green flame retardant cCL". Special Material PCB With the rapid development of electronic products, cCL have higher performance requirements. Therefore, the performance classification from CCL is divided into general performance CCL, low dielectric constant CCL, high heat resistance CCL (general plate L above 150 ℃), low thermal expansion coefficient CCL (generally used for packaging substrate ) And other types.

PCB circuit board sheet description: According to the brand quality level from bottom to high divided as follows:

94HB-94VO-22F-CEM-1-CEM-3-FR-4

Detailed parameters and uses are as follows:

94HB: ordinary cardboard, no fire (the most low-grade materials, die punching, can not do power board)

94V0: flame retardant cardboard (die punching)

22F: single-sided semi-glass plate (die punching)

CEM-1: single-sided glass fiber board (must be computer drilling, can not die)

CEM-3: double-sided half-glass plate (in addition to double-sided cardboard outside the dual-sided low-end material, Special Material PCB a simple double-sided panel can use this material, FR-4 will be cheaper 5 to 10 yuan /

High Tg Printed Circuit Board When the temperature rises to a certain threshold, the substrate changes from "glassy" to "rubbery", where the temperature is called the glass transition temperature (Tg) of the plate. That is, Tg is the highest temperature (° C) at which the substrate remains rigid. In other words, ordinary PCB substrate material at high temperatures, continue to produce softening, deformation, Special Material PCB melting and other phenomena, but also in the mechanical, electrical characteristics of the sharp decline, this will affect the product life, the general Tg of 130 ℃ above, high Tg

Typically higher than 170 ° C, medium Tg is greater than about 150 ° C; PCBs, typically Tg ≥ 170 ° C, are called high Tg printed boards; the Tg of the substrate is improved, the heat resistance, moisture resistance, Chemical, stability and other characteristics will improve and improve.

The higher the TG value, the better the temperature resistance of the sheet, especially in the lead-free process, high Tg applications are more; high Tg refers to the high heat resistance. With the rapid development of the electronics industry, especially in the computer as the representative of the electronic products, Special Material PCB toward the high functionality, high multi-layer development, PCB substrate material needs higher heat resistance as a prerequisite. To SMT, CMT as the representative of the emergence and development of high-density installation technology, the PCB in the small aperture, fine line, thin, more and more inseparable from the substrate high heat resistance support.