Cem-1 PCB material ?
Is so strange for the most of people , is one of Base Material for printed circuit boards. Is low grade in the PCB material industry , Only for Single side PCB, But it is used very widely .
Some People will say Now Technology develop so fast , Every Electronic device become smaller and thinner . Why so low grade material can be use widely .
Is true , Technology is becoming higher and higher , but mean time , Components is also high assemblied more function , This will let more designer use single side PCB ( Cem-1 Material ) to control their Cost .
Single Side PCB ( One Layer PCB ) will reduce the design cost very much , that¡¯s the most important reason .
Cem-1 Material
he materials suitable under the CEM-1 specification in classification of NEMA ¨C the most widespread materials for production of 1-layers printed circuit boards.
Standard CEM-1 material is composite material on a cellulose basis with one layer of laminate (FR-4) on a surface. Usually CEM-1 has milky-white color.
The feature of this material is the impossibility of realization the metallization through holes, thus, this material can be used only for production of 1-layer printed-circuit boards.
Standard CEM-1 satisfies to combustibility class UL 94-V0, as FR-4 material. Mechanical characteristics of CEM-1 are little bit worse, than at FR-4: CEM-1 is more fragile. The dielectric constant and a tangent of angle of dielectric losses of both materials are differ insignificantly.
Thus, CEM-1 is a cheaper alternative for FR-4 material for production of 1-laye prototype printed-circuit boards.
In Cem PCB Material Family ,Have other better one CEM-3 , Let¡¯s see the difference CEM-1 and CEM -3
CEM-1 Composite material composed of woven glass fabric surfaces and paper core combined with epoxy resin. Primarily used in the . Easy punching and excellent electrical properties and higher flexural strength than paper based grades. CEM-1 provides excellent mechanical and electrical properties, and punches well up to .093¡å.
CEM-3 is very similar to FR4. Instead of woven glass fabric a ¡®flies¡¯ type is used. CEM-3 has a milky white color and is very smooth. It is a complete replacement for FR4 and has a very large market share in Asia. It is a kind of flame retardant epoxy copper-clad plate glass material, is generally used in electronics with double sided and multilayer pcb boards. And CEM ¨C 3 is a new printed circuit substrate material developed based on FR ¨C 4. In recent years, CEM-3 is used to replace FR-4 in Japan, even more than the FR ¨C 4 dosage.
In Led lighting Market ,Most of Led PCB Manufacturer use Cem1 as base Material . it can give the best balance between The heat dissipating performance and PCB cost .
In Next article we will introduce more low grade PCB material for our electronic designer , give a low Cost PCB solution to you .
Fr1 . FR2 , FR3, 22F, CEM 1 ,Cem 3 . FR4, FR5, What¡¯s difference between them ? How to Choose the suitable material for your design? how to control your PCB cost , Let ¡®s wait the next article coming .
