Workplace Safety Is No Small Matter: Is a "Soft" Safety Helmet Unqualified?

What happens if a steel awl falls freely from a height and hits a safety helmet?

A soft pop sound, and the helmet shell will definitely be poked with a small hole.

So, can we draw the conclusion that a soft helmet is unqualified?

The truth is quite the opposite.

1. The tip of a steel awl is less than 3mm, with a falling speed of about 5.6m/s and a pressure of ≈800MPa—equivalent to pressing the weight of a car onto a needle tip.
2. The anti-penetration test specified in the National Standard for Safety Helmets (GB 2811-2019)must be conducted with the helmet worn on a "dummy head", with a gap at the bottom and the helmet lining to absorb the impact energy.
3. Placing the helmet directly on a concrete floor with no cushioning at the bottom is like smashing an egg on a cutting board—even the hardest shell can’t withstand it.

Today, we’ll clearly explain how to test, select and wear a safety helmet once and for all.

PART 01: A Safety Helmet Is Not a "Steel Plate" — Hard ≠ Safe

Many of us take it for granted that a hard shell = strong impact resistance.

However, the real cause of head injuries, besides being "crushed", is having nowhere for the impact energy to dissipate.

For example: A raw glass cup is hard but shatters into pieces when dropped on the ground; rubber is soft but only deforms when hit with a hammer.

A common misconception: Why not make the helmet shell with metal? It’s tough, hard and reusable—perfect, right?

Important reminder: Metal shells have long been banned from general industrial use by national standards due to their electrical conductivity, thermal conductivity, and inability to absorb impact and pressure!

A Safety Helmet Requires the Perfect Balance of Rigidity and Flexibility

• Rigid shell: First disperses the impact force over a larger area.
• Flexible lining: Then absorbs the remaining energy through elastic deformation, friction and slight fracture. The final force transmitted to the human head is less than 4900N (the national standard limit), equivalent to 500kg of pressure on the top of the head for just 4 milliseconds.

If the shell is too brittle, it will crack before the energy can be dispersed, and sharp objects will pierce the scalp directly.If the shell is too soft, it will collapse and stick to the head when hit by a heavy object—with the same fatal result.

A safety helmet is not a single "steel plate", but a system engineering of shell + lining—neither part is dispensable.

PART 02: What Does the National Standard Anti-Penetration Test Look Like? Understand in 30 Seconds

01 The Test Subject

A single safety helmet (with a full set of lining)

02 The Test Tool

A 60° steel awl with a tip radius of 0.5mm, length of 40mm, maximum diameter of 28mm and weight of 3kg

03 The Test Envirenment

Standard Type B head mold (simulating a human skull) at a temperature of 23℃±2℃

04 The Test Procedure

The steel awl is dropped freely from a height of 1 meter

05 The Qualification Criterion

The awl tip must not touch the surface of the head mold (an alarm will sound if a copper mesh is connected, indicating failure).

Three Key Test Details

1. The helmet must be worn on the head mold—to simulate the actual gap between the helmet and the head.
2. The drop height must be 1 meter—for controllable impact energy.
3. The awl weight must be 3kg—an overly heavy awl becomes a "javelin" and loses reference value.

In the common wrong test, the drop height is far more than 1 meter, and the helmet is tested without lining or fixation—it’s like a "naked test" for the helmet, so it will definitely be pierced. It’s not that the helmet is soft, but the test method is non-standard!

PART 03: What Does Real Danger Look Like? Translating National Standards into Real-Life Scenarios

In addition to the anti-penetration test, the National Standard for Safety Helmets (GB 2811-2019) includes 6 key tests, each corresponding to real-life accident scenarios:

01 Impact Absorption

• Test: A 5kg hemispherical hammer is dropped from 1 meter; the maximum impact force on the head mold is ＜
• Real scenario: A 50kg bag of cement falls from above with a broken corner. The hemispherical hammer simulates a "blunt impact on the head"—a qualified helmet can turn the huge impact into a mild force.

02 Low Temperature Resistance (-30℃)

• Test: The helmet is frozen in a -30℃ refrigerator for 4 hours, then immediately subjected to impact and penetration tests.
• Real scenario: A tower crane driver is hit by an icicle on the head in the northeast winter—only an unbroken helmet can protect the head.

03 High Temperature Resistance (+150℃)

• Test: The helmet is baked in an oven at 150℃ for 30 minutes, then subjected to an impact test; the shell must not be significantly deformed.
• Real scenario: Molten iron splashes in a metallurgical workshop—an unsoftened helmet can prevent scalp burns (tested on a standard Type B head mold at 23℃±2℃).

04 Electrical Insulation (Type E)

• Test: The voltage is raised to 20kV with a leakage current ＜
• Real scenario: An electrician accidentally touches a live part—the helmet must first provide insulation protectionbefore withstanding impact.

05 Molten Metal Resistance (Type M)

• Test: Molten steel at 1550℃ is splashed on the helmet; the shell must not have continuous combustion for more than 5 seconds.
• Real scenario: A steelmaking furnace worker is swept by splashing molten metal—an incombustible helmet is the key to escape.
• 

Key Takeaways

• Severe scenarios like "steel awl penetration" are rare in real accidents.
• In most cases, safety helmets face blunt impact, oblique slashing, low-temperature brittleness, high-temperature softening, high-voltage electricityand other conditions.

PART 04: Four Steps to Choose the Right Safety Helmet

01 Check the "Certification"

The inner side of the helmet shell must be marked with: QS (Production License) logo, GB 2811-2019, production date, and a 30-month service life.

02 Check the "Test Report"

Request a third-party full-item test report from the supplier, and focus on this key sentence:"Penetration performance: Steel awl dropped from 1m, no contact with head mold surface — Qualified".

03 Check the "Quality & Fit"

• Squeeze the helmet shell: It rebounds immediately after release with no white cracks.
• Press the lining: The headband has good elasticity, and the adjustment teeth do not slip.
• Measure the head gap: A full palm can be inserted horizontally between the top of the helmet and the top of the head.

04 Choose According to the "Job Role"

• Construction work: General type (P)
• Power maintenance: Insulation type (E)
• Steelmaking blast furnace: Molten metal type (M)
• Northern winter work: Low temperature type (with marked temperature resistance)

PART 05: Wearing It Wrong = Not Wearing It At All

Complete a "Life Safety Check" in 5 Seconds (Mnemonic: Pull → Fasten → Tighten → Shake → Check)

1. Pull: Adjust the lining to be level, with the brim two finger widths above the eyebrows.
2. Fasten: Tighten the rear hoop knob clockwise—one finger can just be inserted between the hoop and the head.
3. Tighten: Leave a 1-finger gap for the chin strap; the helmet does not rotate when bowing or shaking the head.
4. Shake: Grasp the shell and shake left and right—the lining moves with the shell but the head does not—indicating the force absorption system is normal.
5. Check: Verify the production date; scrap the helmet immediately after 30 months. Discard any helmet with cracks, deformation or a history of heavy impact.

Important Maintenance Tip

The helmet shell can be cleaned, but exposure to direct sunlight + gasoline + spray paint will secretly break the plastic molecular chains, turning the helmet from a "tough rubber" into a "brittle cookie".

PART 06: Final Words: Don’t Wrong a Good Helmet as a "Scapegoat"

A safety helmet is not a magic iron cover, but a system solution combining material mechanics, national standards and correct use.

We recommend having safety helmets tested in professional laboratories, purchasing products that comply with national standards, and wearing them in accordance with specifications!

May every qualified safety helmet firmly catch the way home for every worker in the 0.01 second of impact!

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