What Are The Environmental Requirements For The SMT Factory?

Environmental requirements for the SMT Factory?

Abstract: In the SMT chip processing factory, SMT is a complex and comprehensive system engineering technology, involving PCB boards, components, process materials, automated precision assembly in SMT chip processing, solder joint testing equipment, and other factors. Among them, SMT production equipment is high-precision mechatronics equipment. Solder paste and patch adhesive in SMT process materials are high-temperature thixotropic fluids. They have certain requirements for environmental cleanliness, humidity, and temperature. Companies that need OEM materials can go to the SMT chip processing factory to visit and inspect the specific production environment. The processing environment can directly affect product quality. A reliable SMT patch processing factory will pay attention to every detail in production, and environmental factors are one of the control details. In order to ensure the normal operation of the equipment and the welding quality of the product, let SZTech-SMT introduce to you the environmental requirements for the workshop of the SMT patch processing factory.

Clean level

The production workshop of the SMT patch processing factory should be kept clean and free of dust (including the ground, equipment surface and interior without dust and impurities.) The air cleanliness is 100,000 (BGJ73-84).


The ambient temperature of the production workshop is (25±3)°C as the best, generally 22°C ~ 28°C, and the limit temperature is 20°C ~ 30°C.


If the relative humidity in the air in the production workshop is too high, it will easily lead to defects such as tin beads and solder splashes after welding; if the relative humidity is too low, it will cause the solvent in the flux to volatilize, and it is easy to generate static electricity, resulting in a series of defects. Therefore, the relative humidity should be controlled from 45% to 70%. In view of the above requirements for the SMT chip processing and production environment, the general production workshop should be equipped with air conditioning and a certain amount of fresh air is required to ensure human health.

Power Source

The production workshop generally requires single-phase AC220 (220±10%) and three-phase AC380 (380±10%). The equipment must be equipped with a voltage stabilizer to maintain the stable operation of the equipment.

Air Source

According to the use requirements of the equipment, the workshop should be equipped with an air source with a certain pressure. Generally, the compressed air compressor should be placed outside the workshop. The general pressure is 5kg/c㎡. It is required to increase the filtration and purification of the gas to ensure that the gas is oil-free, dust-free, and water-free. Stainless steel or high-pressure pipes are used as gas pipes.

Exhaust system

Reflow soldering equipment and wave soldering equipment need to be equipped with an exhaust system, and the minimum flow rate of the exhaust duct is 500 cubic feet per minute (14.15m/min).

ESD environment

Staff must wear anti-static clothing and anti-static shoes when entering the workshop, and wear anti-static wristbands when touching products. The work area should be equipped with anti-static floors, static lines, anti-static seats, anti-static packaging bags, turnover boxes, and PCB board racks wait.

Summary Environmental Requirements for the SMT Factory?

The above content is shared by SZTech-SMT for you (what are the environmental requirements for the workshop in the SMT patch processing factory?) Related content, I hope it will be helpful to you, learn more about SMT patch processing knowledge,

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