A face shield is a piece of personal protective equipment (PPE). To provide optimal protection, they are designed to cover the full face (from the top of the head to the chin and covering the ears horizontally) and protect the wearer from viral spray particles. Face shields are arguably best at protecting from coughs and sneezes.
About Face Shield
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Face Shield Structures
Seems are important - Make sure leakage doesn't occur
Two methods are used to manufacture face shields: 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.
Face Shield Materials
There a 2 major materials for medical face shields
When it comes to selecting face shields, the most important consideration is the lens plate. The quality of the lens plate ultimately reflects the clarity and impact resistance of the face shield. Cheaper materials with poor clarity often result in dizziness and fatigue after a period of time. Here are some common materials for face shields.
- Polycarbonate (PC)
- Glycol Modified Polyethylene Terephthalate (PETG)
- Polyethylene Terephthalate (PET)
Face Shield Regulation & Standards
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)
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
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