After using a sodium hypochlorite spray gun for disinfection, do you need to wait for a while before contacting people?

After using a sodium hypochlorite spray gun for air disinfection, it is indeed necessary to wait for a period of time before people can enter or come into contact with the space to ensure safety and fully utilize the disinfection effect. The following is a detailed breakdown:

1. Ensure that the disinfectant is fully effective
Reason: Sodium hypochlorite requires a certain amount of time to completely kill microorganisms in the air or on surfaces.
Suggestion: After spraying, wait for 10-30 minutes to allow the disinfectant enough time to complete its sterilization effect.

2. Prevent personnel from inhaling residual mist
Reason: There may be residual sodium hypochlorite mist or trace amounts of chlorine gas in the air that has just been disinfected. Direct inhalation may cause respiratory discomfort, coughing, sore throat, etc.
Suggestion: After disinfection, keep the space ventilated and wait for the fog to settle and the air to renew. It is usually recommended to ventilate for 15-30 minutes before personnel enter.

3. Avoid skin or eye irritation
Reason: Residual disinfectant droplets in the air that come into contact with the skin or eyes may cause allergies, stinging, or dryness.
Suggestion: Before personnel enter, ensure that the space is dry and free of obvious fog, especially for sensitive groups such as children and the elderly who should delay entry.

4. Avoid leaving irritating substances on the surface of items
Reason: There may be residual sodium hypochlorite on the surface after spraying, and direct contact may cause hand irritation or contamination of food and items.
Suggestion: After disinfection, wipe the areas that people frequently come into contact with with with clean water (such as tabletops and door handles), especially when using high concentration sodium hypochlorite.

5. The specific waiting time varies depending on the environment and concentration
Low concentration (such as below 500mg/L): Suitable for daily air disinfection, usually wait for 15-30 minutes.
Medium to high concentrations (such as 1000mg/L and above): suitable for virus outbreaks or high-risk areas. It is recommended to wait for a longer time, preferably 30-60 minutes, and strengthen ventilation.

6. Refer to authoritative standards and product specifications
Reason: Different brands and models of sodium hypochlorite spray guns use different concentrations of disinfectant, and there are also slight differences in waiting time and processing methods.
Suggestion: You should refer to the usage instructions on the spray gun manual or disinfectant label and follow the standard operation.