F2412-11 —specifies the test methods that measure the resistance of protective footwear against a range of hazards that can produce an injury in the workplace.
F2413-11—specifies the minimum performance requirements protective footwear needs to meet to resist a range of hazards that can produce an injury in the workplace.
The 11 after the dash signifies the footwear meets the ASTM F2412 or F2413 requirements issued in 2011.
The second line starts by identifying the gender of the user the footwear was made for (M = Male or F = Female). It is then followed by the footwear’s ratings.
Impact (I/75). Safety toe footwear is tested to meet one of two units of measurement for impact rating: 50 or 75 pounds. Footwear rated I/50 will protect toes from an impact up to 50 pounds and I/75 will protect against 75 pounds. The impact test is performed by dropping a 50-pound weight at a height of 18 inches at a designated speed.
Compression (C/75). Safety toe footwear is tested to meet one of two units of measurement for compression rating: C/50 or C/75. Footwear with a C/50 rating can withstand compressive loads up to 1,750 pounds while C/75 footwear can withstand 2,500 pounds.
Metatarsal (Mt/75). Metatarsal protective footwear must first meet impact and compression class 75 requirements. The metatarsal test is performed by dropping a 50-pound weight at a height of 18 inches onto the metatarsal guard. The standard does not cover aftermarket add-on guards.
The third line lists additional hazards the footwear protects the user from.
Conductive (Cd) footwear protects the user from hazards that may result from a build up of static electricity and to reduce the potential of explosives or volatile chemicals from igniting.
Electrical Hazard (EH) footwear has non-conductive, electrical shock-resistant heels and soles able to withstand the application of 18,000V at 60 Hz for one minute without any current flow or leakage current in exceeding one millampere (mA) under dry conditions.
Static Dissipative (SD) is designed to protect users against hazards that may exist due to excessively low footwear resistance and to maintain a high level of resistance to decrease the possibility of electric shock. The footwear must meet a lower limit of electrical resistance of 106 ohms and an upper limit of 108ohms.
Puncture-resistant (PR) footwear has a puncture-resistant plate between the insole and outsole and is a permanent part of the footwear. The footwear must have a minimum puncture resistance of 270 pounds and show no signs of cracking after 1.5 million flexes.
Impact ( I ) and Compression ( C ) Resistance
A safety test is performed by dropping a 50 pound weight from a predetermined height (1.5 feet) at a designated speed. The I/75 C/75 rated footwear will protect the wearer’s toes from an impact of up to 75 foot-pounds and compressive loads up to 2,500 pounds.
The clearances under the safety toe after the test is performed are as follows:
Men-0.500 Inch (12.7mm)
Women-0.468 Inch (11.9mm)
Metatarsal – MT
Metatarsal protection is designed to prevent or reduce injuries when the toe and metatarsal areas of the foot are exposed to hazards. The metatarsal test is performed by dropping a 50 pound weighted bar 1.5 feet onto the metatarsal guard. (75 foot-pounds of impact energy.) The impact energy is the same as for the safety- toe impact. The clearance is measured by inserting a wax foot-form into the shoe to accurately measure the deflection of the metatarsal guard on the interior of the shoe.
The clearances under the metatarsal guard after the metatarsal impact are as follows:
Men- 1 Inch (25.4mm)
Women-0.937 Inch (24mm)
Conductive Footwear- CD
Conductive footwear is designed to discharge static electricity from a person’s body through their shoes to the ground. This type of footwear is designed to minimize static electricity and take the “charge” out of your body so static discharge sparks do not occur.
The electrical resistance of conductive protective footwear should range between 0 and 500,000 ohms. (One-half Mega Ohm)
Electrical Shock Resistant Protection- EH
EH protective footwear is designed to reduce the hazards due to accidental contact with live electrical circuits and is only meant to be used as a secondary protection for electrical hazard environments.
The outer surface of the sole and heel shouldn’t be penetrated by any electrically conductive component, like nails in the heel.
EH shock resistant footwear must be capable of withstanding the application of 18,000 volts at 60 Hz for 1 minute with no current flow or leakage in excess of 1.0 milliampere.
Static Dissipating Footwear-SD
SD protective footwear is designed to reduce the buildup of excess static electricity by conducting body static charge to ground, while maintaining a sufficient high level of resistance that protects the wearer from electrical hazards due to live electrical circuits.
The electrical resistance must be greater than 1,000,000 ohms (1 Mega Ohms) and not exceed 100,000,000 ohms (100 Mega Ohms).
Sole Puncture Resistant Footwear – PR
Puncture resistant footwear includes a sole puncture resistant device (usually below the insole) which reduces the possibility of puncture wounds to the bottom of the feet.
PR footwear should withstand a minimum nail penetration force of 270 pounds.