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Concept
Face shield
Summary
A face shield, an item of personal protective equipment (PPE), aims to protect the wearer's entire face (or part of it) from hazards such as flying objects and road debris, chemical splashes (in laboratories or in industry), or potentially infectious materials (in medical and laboratory environments). Depending on the type used, a face shield may protect its wearer from a physical hazard, chemical splashes, or biological hazards.
A face shield is intended to protect the wearer's partial or entire face and the eyes from hazards. Face shields should be used with spectacles and/or goggles.
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).
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.
Polycarbonate (PC)
Provides excellent impact resistance, optical quality, heat resistance and normal chemical resistance.
Cellulose acetate (CA)
Provides normal impact resistance, optical quality, heat resistance and good chemical resistance.
Two methods are used to manufacture face shields: extrusion and injection molding.
Official source
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