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A United States Navy Electrician's Mate wearing a face shield while checking for bad fuses on a lighting panel aboard the USS Carl Vinson (CVN 70)

A face shield is a device used to protect wearer's entire face (or part of it) from hazards such as flying objects and road debris, chemical splashes (in industry), or potentially infectious materials (in medical and laboratory environments).

Contents

IndustryEdit

The face shield is a device intended to protect the wearer's partial or entire face and the eyes from different hazards, depending on faceshield type. Faceshields should be used with spectacles and/or goggles.[1]

StandardEdit

ANSI (American Standard)
  • Mark Z87: Basic impact: Faceshields shall be capable of resisting impact from a 25.4 mm (1 in) diameter steel ball dropped from a height of 127 cm (50 in).
  • Mark Z87+: High impact: Faceshields shall be capable of resisting impact from a 6.35 mm (0.25 in) diameter steel ball traveling at a velocity of 91.4 m/s (300 ft/s).
    • ref. ANSI Z87.1
EN 166 (European Standard)

These shields are for protection against high-speed particles, and must withstand the impact of a 6 mm nominal diameter steel ball, striking the oculars and the lateral protection at the speed stated.

  • Mark A: 190 m/s.
  • Mark B: 120 m/s.
  • Mark F: 45 m/s.
    • ref. EN166
CSA (Canadian Standard)

Z94.3-15 Eye and Face Protectors Class 6 relates to face shields, and is divided into 3 sub-classes

  • 6A – Impact, piercing, splash, head, and glare protection.
  • 6B – Radiation protection. Also for low heat, splash, glare, and light non-piercing impact protection.
  • 6C – High-heat applications and light non-piercing impact protection only.
    • ref. CSA Z94.3-15

See also welding helmet.

MaterialEdit

Provide excellent impact resistance, optical quality, heat resistance and normal chemical resistance.

Provide normal impact resistance, optical quality, heat resistance and good chemical resistance.

ManufacturingEdit

Two methods are used to manufacture faceshields: extrusion and injection molding. Faceshields cut from extrusion sheets provide better impact resistance than injection molded faceshields because extrusion sheets are made of high molecular weight plastic pellets while injection molding must use lower molecular weight plastic pellets, which provide better melt flowing property needed by injection molding. For example, even 0.8 mm thickness faceshields made of extrusion polycarbonate sheets can withstand the impact of a 6 mm nominal diameter steel ball traveling at the speed 120 m/s (European standard, protection against high-speed particles – medium energy impact), while injection molding faceshields must have at least 1.5 mm thickness to withstand the same impact. However, injection molding can provide more complicated shape than extrusion.

MedicalEdit

A video describing research on the efficacy of face shields to protect against aerosol emitted from coughing.

In medical applications, "face shield" refers to a variety of devices used to protect a medical professional during a procedure that might expose them to blood or other potentially infectious fluids. An example is the use of a CPR mask while performing rescue breathing or CPR. Another example is the use of personal protective equipment to guard the face against exposure to potentially infectious materials.

PoliceEdit

In riot protection, "face shield" often means a transparent visor.

ConstructionEdit

 
Atlantic Ocean (Jan. 27, 2006) - Chief Damage Controlman, John Brooks, removes the face shield from a Sailor’s MCU-2/P gas mask after washing it with decontamination solution during a General Quarters Drill aboard the Nimitz class aircraft carrier USS Dwight D. Eisenhower (CVN 69). Eisenhower is underway conducting carrier qualifications.

On many construction sites many workers use face shields to protect them from debris or sparks. Many tools for cutting and working with metal recommend the use of a face shield. Examples include welding equipment or metal chop saws.

See alsoEdit

ReferencesEdit

  1. ^ ANSI Z87.1-2003, page 11

External linksEdit

  Media related to Face shields at Wikimedia Commons