Is dry powder inhalation toxic? 3 health precautions you must take after using a dry powder fire extinguisher

1. Analysis of the Composition and Toxicity of Dry Powder Fire Extinguishers

Common Types of Dry Powder

Is it toxic?

Short-term exposure:

Inhalation of small amounts → Cough and sore throat (resolved within 1-2 days)

Inhalation of large amounts → Chest tightness and difficulty breathing (requires medical attention)

Long-term risks:

Repeated exposure may cause chronic bronchitis (occupational case among firefighters)

2. Three Essential Precautions After Extinguishing a Fire

Immediate Evacuation and Ventilation

Action:

After extinguishing the fire, quickly retreat to an upwind location.

Open windows/turn on exhaust fans to accelerate dust dispersal.

Stay for at least 30 minutes before returning.

Note:

Do not use a standard fan (direct airflow will stir up accumulated dust).

Personal Hygiene

Part-by-Part Treatment:

Don'ts:

Do not rub your eyes! It may cause corneal scratches.

Cleaning Environmental Residues

Processing by Material:

Hard Surfaces (Floors/Furniture): Wet mop with a neutral detergent, focusing on crevices (dry powder easily accumulates).

Soft Surfaces (Curtains/Carpets): Vacuum with a HEPA filter. Local stains should be sprayed with a 1:1 mixture of white vinegar and water, then wiped.

3. Indicators for judging the service life of dry powder fire extinguishers

"Dual Expiration Dates" of Dry Powder Fire Extinguishers

1. Cylinder Expiration Date (Mandatory Retirement Date)

Maximum Service Life: 10 years (calculated from the date of manufacture).

Retirement Conditions:

Rust area ≥ 1/3 of the cylinder

Obvious deformation, cracks, or signs of repair

Nameplate blurred, unable to identify manufacturing information.

2. Expiration Date of Fire Extinguishing Agent (Regular Replacement Required)

First Maintenance: First inspection and replacement of the extinguishing agent is required after 5 years of manufacture.

Subsequent Maintenance: After the first maintenance, re-inspection and refilling are required every 2 years.

Signs of Fire Extinguishing Agent Failure: Agglomeration, weight loss (leakage), or abnormal pressure.

Three Key Indicators for Determining Continued Use

1. Pressure Gauge Status

Green Zone: Normal pressure, continued use.

Red Zone: Insufficient pressure, requiring immediate repair or replacement.

Yellow Zone: Excessive pressure; the new extinguisher may function normally, but excessive pressure requires inspection.

2. Visual Inspection

Cylinder: No rust, deformation, or cracks (rust area <1/3).

Nozzle/Nozzle: No blockage, cracking, or damage.

Safety Pin/Seal: Intact.

3. Production Date and Repair Label

Production Date: Check the cylinder stamp or nameplate. Any cylinder older than 10 years must be scrapped.

Repair Label: After the first repair, a label from the testing agency should be placed, indicating the next inspection date.

Special Cases

1. Unused but Expired

Over 10 Years: Even if unused, the cylinder must be scrapped.

Between 5-10 Years: If the pressure is normal and the appearance is intact, the cylinder can be sent to a professional for inspection and refilling.

2. Used or Abnormal Pressure

Even if not expired: If used or the pressure is abnormal, repair and refill are required immediately.

3. Storage Environment Impact

High temperature/humid environment: This accelerates the agglomeration of the extinguishing agent and corrosion of the cylinder. It is recommended to shorten the inspection interval.