What are the methods for storing and cleaning safety helmets?

Methods for storing and cleaning safety helmets

1. Storage Environment Requirements
Dry and Ventilated: Safety helmets should be stored in a well-ventilated environment free from moisture and standing water to prevent material aging caused by dampness.
Avoid High Temperatures and Direct Sunlight: High temperatures weaken the impact resistance of the helmet shell, and ultraviolet rays in sunlight accelerate material aging.
Prevent Heavy Pressure: Do not place heavy objects on top of the safety helmet to avoid deformation or cracking of the shell.

2. Prevent Chemical Corrosion and Contamination
Keep away from acids, alkalis, and corrosive substances: Safety helmets must not be stored in environments that come into contact with acids, alkalis, or other corrosive chemicals.
Keep Clean: Before storing, ensure the helmet shell surface is free of oil and dust to prevent contamination from entering the internal cushioning layer.

3. Cleaning Frequency and Procedures
Regular Cleaning: It is recommended to perform routine cleaning every two weeks. In harsh working environments (such as dust and oil), this can be reduced to once a week.
Cleaning Tools: Gently wipe the helmet shell and internal lining with a soft, damp cloth or neutral soapy water. Avoid using strong acids, strong alkalis, or abrasive cleaning agents. Drying: After cleaning, allow the helmet to air dry naturally or wipe it dry with a clean, soft cloth. Ensure the helmet is completely dry before storing.

4. Inspection and Replacement
Daily Pre-wear Inspection: Check the helmet shell for cracks, dents, or obvious wear. Confirm that the chin strap and headband are securely fastened.

Lifespan: Safety helmets generally have a lifespan of 2–5 years. They must be discarded immediately after impact to prevent failure.

How to Precisely Adjust Helmet Size and Head Circumference?

Precise Adjustment of Helmet Size and Head Circumference

1. Selecting the Appropriate Size Based on Head Circumference
Size Classification: Common ratchet helmets are available in S, M, and L sizes. Select the corresponding size based on the user's head circumference.

Head Circumference Measurement: Use a soft measuring tape to measure the widest part of the head (from forehead to back of the head) and match it to the standard size chart.

2. Adjusting the Headband and Chin Strap
Headband Adjustment: Loosen the back adjustment buckle and stretch or tighten the headband to distribute it evenly around the head.

Jaw Strap Gap: Adjust to leave a gap of about one finger's width between the chin strap and the jaw, ensuring stability while avoiding pressure.

3. Adjust Helmet Liner Height and Angle

Vertical Spacing: The vertical distance between the top of the chin liner and the top of the head should be maintained at 25–50mm (approximately 2–4cm) to ensure sufficient cushioning space during impact.

Angle Requirement: The angle between the chin liner and the vertical direction is recommended to be maintained at 20–30°, which can be achieved by adjusting the guide strap depth.

4. Stability Check

Shaking Test: After adjustment, gently shake the helmet to confirm that the helmet does not wobble significantly or fall off.

Wearing Comfort: The helmet should feel comfortable and fit snugly when worn, without any pressure pain or looseness.