What are the general requirements for the dew point of the factory?

Factory dew point requirements are usually classified according to the production process, product characteristics and environmental control needs. General industrial environment dew point requirements, precision manufacturing and special process dew point requirements, special industry dew point requirements three categories, as follows:

1. General Industrial Environment Dew Point Requirements

1. basic control range
   most common industrial environments (such as machining, warehousing, etc.) require dew point temperatures to be controlled 0 ℃ to 10 ℃ between, corresponding to a relative humidity of about 30%-60%. This range can prevent the formation of condensation water on the surface of the equipment and avoid corrosion of metal parts or moisture of electronic components.

2. Typical application scenarios

   • mechanical processing workshop dew point control is required to reduce tool wear and workpiece surface corrosion.
   • Storage environment: Prevent the goods from damp and mildew, especially food, medicine and other materials sensitive to humidity.
   • General office area maintain comfortable humidity and avoid paper curl or static problems.

2. precision manufacturing and special process dew point requirements

1. high precision control range
   precision manufacturing (e. g., semiconductors, optical instruments) and special processes (e. g., painting, electroplating) require dew point control. -20 ℃ to -40 ℃, the corresponding relative humidity is lower 5%. This range ensures that:
   • material stability: Prevent metal oxidation, hydrolysis of polymer materials or adsorption of moisture to cause performance degradation.
   • Process reliability: Avoid coating blistering, insufficient plating adhesion or short circuit of electronic components.
   • Product consistency: Reduce dimensional deviations or performance differences caused by humidity fluctuations.
2. Typical application scenarios
   • semiconductor Manufacturing: Wafer processing needs to be carried out in an ultra-low dew point environment to prevent moisture-induced oxidation or contamination.
   • Lithium battery production dew point is required for electrode manufacturing, electrolyte injection and other processes. ≤-40 ℃ avoid moisture to accelerate the decomposition of the electrolyte or cause the battery to bulge.
   • Precision painting: Dew point shall be controlled in automobile body painting to prevent film blistering or pinhole defects.

3. special industry dew point requirements

1. extreme control needs
   in some industries, due to product characteristics or safety requirements, the dew point needs to be controlled below -50 ℃, the corresponding relative humidity is close 0%. For example:
   • solid State Battery Manufacturing (Sulfide Process): Dew point needs to reach -50 ℃ to prevent lithium metal from reacting with moisture to cause an explosion or fire.
   • Special material storage lithium metal and other materials sensitive to water and oxygen need to be stored at the dew point. ≤-40 ℃ environment, ensuring long-term stability.
   • high purity gas production: For example, electronic grade special gases (such as SiH, NFalready) need to be filled under ultra-low dew point conditions to avoid the introduction of impurities.
2. Industry Codes and Standards
   • lithium battery industry: Domestic mainstream enterprises (such as BYD and Yiwei Lithium Energy) refer to Japanese and American standards and require dew points in drying rooms and glove boxes. ≤-40 ℃.
   • Pharmaceutical Industry with reference to the GMP standard, the dew point of the clean area is usually controlled below 5 ℃ reduce the risk of microbial growth.
   • electric power industry: High voltage gas insulation equipment (such as GIS) need to control the gas dew point to prevent the insulation performance degradation.

The Core Value of 4. Dew Point Control

1. product quality assurance: Prevent material moisture absorption, oxidation or chemical reaction out of control, improve product yield.
2. Equipment life extension: Reduce the risk of corrosion, wear or icing, and reduce maintenance costs.
3. Production safety promotion: Avoid combustible gas condensation or electrostatic accumulation, reduce the risk of fire and explosion.
4. Energy efficiency optimization: Avoid energy waste caused by excessive drying by precisely controlling the operation of drying equipment.