Choose from use
For adhesives, it is best to use a medium epoxy resin (0.25-0.45) resin, such as 6101.634; for castables, it is best to use a high epoxy resin (>0.40) resin, such as 618.6101; Low epoxy (<0.25) resin, such as 601.604.607.609.
Choose from mechanical strength
The resin with too high epoxy value is strong, but brittle; the strength is good at high and low temperatures with moderate epoxy values; the lower the epoxy value, the lower the strength at high temperatures. Because the strength is related to the degree of cross-linking, the epoxy value is high after curing, and the degree of crosslinking is also high. The epoxy value is low and the degree of crosslinking is low after curing, so that the difference in strength is caused.
Choose from operational requirements
No need for high temperature resistance, no requirement for strength. It is hoped that the epoxy resin can be dried quickly and not easily lost. The resin with lower epoxy value can be selected. If the permeability is good, the strength is better, and the epoxy value can be selected. Resin.
The screw driver is a common tool used to turn the screw to make it in place. It usually has a thin wedge head, which can be inserted into the slot or notch of the screw head.
There are mainly one character (minus sign) and cross (plus sign). There are also common hexagon screw drivers, including two kinds of hexagon and hexagon. Each screw driver has different specifications and can be customized.
According to different head types, screwdrivers can be divided into one character, cross, meter character, star (computer), square head, hexagon head, Y-shaped head and so on. One character and cross are the most commonly used in our life, such as installation and maintenance. It can be said that as long as there are screws, screwdrivers will be used.
Hexagonal head is not used much, commonly used in the hexagonal wrench, such as some machines a lot of screws are with hexagonal hole, convenient for multi angle force. We don't see many big ones. Small ones are often used to repair mobile phones, hard disks, notebooks and so on. We call small screwdrivers clock batch. We often use star T6, T8, cross pH0, ph00 and so on.
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