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For glasses to meet the standard for safety, which two requirements must be fulfilled?
Polycarbonate lenses and a frame thickness of 2mm
Polycarbonate lenses and a 3mm minimum thickness
Plastic lenses and a 4mm minimum thickness
Glass lenses and a 2mm minimum thickness
The correct answer is: Polycarbonate lenses and a 3mm minimum thickness
The requirements for safety glasses are designed to ensure durability and resistance to impact. The specification for polycarbonate lenses is significant because polycarbonate material is known for its high impact resistance, making it an ideal choice for safety glasses. Additionally, the requirement of a 3mm minimum thickness for the lenses enhances their strength and resistance to breakage. In safety eyewear standards, having both polycarbonate lenses and a sufficient thickness is crucial for providing adequate protection against potential hazards. This combination ensures that the lenses can withstand high-velocity impacts, which is a typical concern in environments where safety glasses are needed. The other options suggest different materials and thicknesses that either do not align with the standards commonly recognized for safety eyewear or do not meet the necessary criteria for impact resistance. Therefore, the combination of polycarbonate lenses with a 3mm minimum thickness is essential for compliance with safety standards.