Seam width
The width of the seam created by the vacuum sealer's welding slat.
The wider the seam, the more reliable the package is, the lower the likelihood that the welding line will turn out to be a “weak spot”. On the other hand, a large width requires a powerful heater and significantly affects the price of the device. In general, for domestic use, a value of 2 – 2.5 mm is considered quite sufficient; but in heavy industrial models used for long-term storage, values of 10 mm and even more can occur.
For additional reliability, the seam can be made double (see "Features").
Power consumption
Rated power consumption of the device. Usually, the characteristics indicate the average power in normal operation; peak values can be much higher, but this mode does not last long.
On the one hand, the efficiency and speed of vacuuming directly depend on the power consumption, on the other hand, the consumption of electricity. And heavy high consumption industrial-grade devices may require a three-phase connection (see "Power supply").
Material
The main material used in the construction of the body of vacuum sealer.
— Plastic. Plastic is inexpensive and quite practical, but noticeably inferior to metal in terms of strength, heat resistance and scratch resistance. Therefore, it is mainly used in devices that are not designed for large volumes of work and high loads — namely, manual and low-power desktop vacuum sealers.
— Metal. Metal cases are extremely strong and reliable, but they are more expensive and weigh more than plastic cases. Therefore, they are found mainly in powerful industrial models, for which strength and reliability are of decisive importance.
— Plastic / metal. Usually, in this case, plastic cases are meant, in which especially critical places are reinforced with metal inserts. This option is typical mainly for desktop models of intermediate and advanced levels. See above for details on plastic and metal; Here, we note that such a combination makes it possible to combine the advantages and, to some extent, mutually compensate for the shortcomings of both materials. So, the cases are not as expensive and heavy as all-metal ones, and at the same time more reliable than all-plastic ones.
