What is the appropriate humidity for photographic equipment in moistureproof box?

55% ~ 45% of cameras, video cameras, lenses, microscopes, magnifying glasses, telescopes, tapes, disks, recording tapes, films, musical instruments, stamps and furs.

The lens will grow mildew due to humidity-the lens of cameras, digital cameras and video cameras is very sensitive to humidity. Once the moisture filled with mold in the air touches the lens surface, it will gradually corrode the inside of the lens like dental worms, causing serious damage.

According to the regulations of the International Camera Industry Association, when the temperature is lower than 10℃ or the humidity is lower than 60%RH, the mold will stop breeding. Mold can grow when the humidity is 60%RH, and explosive growth will occur between 70%RH and 90%RH!

Therefore, the minimum humidity of the camera should not be lower than 40%RH, and the maximum humidity should not exceed 60%RH. 40%RH to 50%RH is the best! The humidity of the drying box for storing floppy disks, tapes, slides, photos, films, video tapes, optical film cameras, digital cameras, digital cameras and electronic equipment is 45%RH~55%RH.

Extended data:

According to the regulations of the International Camera Industry Association, when the temperature is lower than 10℃ or the humidity is lower than 60%RH, the mold will stop breeding. Precious lenses, cameras, expensive instruments, samples or painstakingly worked things have been destroyed by dampness and mildew. Therefore, it is the best choice to use electronic moistureproof box to save valuables.

Using a simple sealed plastic box (moisture-proof box) can quickly dehumidify, but it has two major disadvantages:

1. It is easy to forget to replace the desiccant, resulting in the loss of moisture-proof effect. When the absorbed water vapor reaches a certain degree of saturation, it will lose its ability to continue dehumidification. Because it can't absorb and eliminate water in real time, it will become the opposite effect of "moisturizing". If you don't pay attention to the replacement of the drying bag, it will become a "moisturizing box".

2. Some hygroscopic agents contain calcium chloride. When calcium chloride is wetted and hydrolyzed, it will release a small amount of chlorine, which has strong oxidation and is easy to corrode equipment. In addition, pay attention to this desiccant: after a long time, there will be a certain amount of liquid in the container where the desiccant is placed. Be careful not to knock it over, otherwise it will never dry in the camera!

Difference:

From the perspective of preservation, you need to know the most important point of preserving a camera. "What should the lens be preserved and protected?" 』

Conditions of lens mildew

1. Humidity: When the relative humidity of the environment is more than 60%, mold can grow.

When the RH is higher than 65%, the growth is accelerated, and when the humidity reaches RH80-95%, it is an environment with high incidence of mold.

2. Temperature: The mycelia of mold can grow at the ambient temperature above 8 degrees, and the growth is accelerated above 12 degrees.

When the temperature is higher than 10 degree and the humidity is higher than 60%, mold will do harm to articles.

When the temperature is 20-35 degrees and the humidity is 75-95%, mold can grow explosively.

3. Nutrition: Mold needs few nutrients, such as carbon, nitrogen, potassium, phosphorus, sulfur and magnesium.

It is an essential nutrient for mold, and mold can also absorb all the basic elements from inorganic salts.

When the articles contain the nutrients needed by the above molds and the temperature and humidity of the environment are suitable for spore development, molds can grow. Therefore, it is the most basic condition to keep the lens in an environment with relative humidity below 50%RH.

Reference source; Baidu Encyclopedia-Camera moistureproof box