Packaging substrate materials: Why are ABF substrates more advanced than BT substrates?

Generally, an important variety of rigid substrate materials is copper clad laminate. It is made of reinforced material (Reinforeing Material), impregnated with resin adhesive, dried, cut and laminated into blanks, then covered with copper foil, used steel plate as a mold, and processed by high temperature and high pressure forming in a hot press. The semi-cured sheet used in the general multilayer board is the semi-finished product of the copper clad laminate in the production process (mostly glass cloth impregnated with resin, dried and processed). In a rigid PCB, the substrate material is typically FR-4. However, in the Flex PCB, the commonly used substrate materials are polyimide (PI) film and PET (polyester) film, and besides these, polymer films such as PEN (polyethylene phthalate),PTFE, and aramid can be used.

2023-09-26

Development Process of PTFE

Polytetrafluoroethylene is called "plastic king". Roy Planct, the father of fluororesin, began to study freon substitutes in DuPont Company in the United States in 1936. They collected some tetrafluoroethylene and stored it in steel cylinders for the next experiment. However, when the pressure reducing valve of the steel cylinder was opened the next day, no gas overflowed. They thought it was air leakage, but when the steel cylinder was weighed, they found that the steel cylinder did not lose weight. They sawed through the cylinder and found a large amount of white powder, which was Teflon.

2023-09-25

PTFE Film Introduction

PTFE film is made of molded sintered cylindrical blanks, which are cut into films by machine tools and then calendered. According to the different treatment methods, it can be divided into three kinds of oriented film, semi-oriented film and non-oriented film. At present, PTFE film products include porous film, microfiltration membrane, color film and so on.

2023-09-25

PTFE Performance

Polytetrafluoroethylene has extremely high chemical corrosion resistance, such as in concentrated sulfuric acid, nitric acid, hydrochloric acid, and even boiled in aqua regia, its weight and performance are unchanged, and it is almost insoluble in most solvents. Slightly soluble in all alkanes (about 0.1g/100g) above 300°C. PTFE does not absorb moisture, non-flammable, oxygen, ultraviolet are extremely stable, so it has excellent weather resistance.

2023-09-25

Mechanical properties of polytetrafluoroethylene

Polytetrafluoroethylene is a typical soft and weak polymer. The mutual attraction between macromolecules is small, and the stiffness, hardness and strength are small. It will deform under long-term stress.

2023-09-25