Chile Safety Footwear Standards

General footwear NCh772/1-1992

Antistatic footwear NCh2147/1-1993

Insulating footwear NCh 2147/2-1993

Semiconductor (Conductive) footwear NCh2147/3-1993

 

NCh772/1 General Safety Footwear

• Must have toe caps complying with NCh772/2 (see below)

• Must have counter stiffener (closed seat region)

• Stitch densities are specified

• Upper must be leather

▷ Tensile strength min 25MPa NCh773/1

▷ Elongation at break min 50% NCh773/1

▷ pH min 3.5

▷ Chrome Oxide min 2.5%

• Lining must be leather or leather split, 8 hour immersion, 16 hour drying

▷ Water absorption min 35% NCh773/1

▷ Water desorption min 40% NCh773/1

•  Outsoles NCh1350 (see below)

▷ General footwear NCh772/1

▷  Antistatic footwear NCh2147/1

▷ Insulating footwear NCh 2147/2

▷ Conductive footwear NCh2147/3

 

Shank must have steel shank min 1.0mm thick and 34 Rockwell C hardness

• Nails, Screws or Rivets must be copper, bronze or stainless steel

• Impact resistance NCh773/4 range of clearance for footwear from 13mm for size 38 and below to 15.5 above size 46

• Sole attachment NCh773/5 Toe 800N, Heel 500N

• Outsole must be marked in waist area with manufacturer’s name or the importer name

• Additional guidance is provided for a variety of upper material properties according to

NCh773/1 to be agreed between parties.

 

Thickness NCh139 (not seen) – 1.8 to 2.4mm

▷ Grain distension – min 7mm

▷ Tear strength NCh622 (not seen) – min 80N/mm

▷ Area shrinkage (100°C) – max 5%

▷ Non Chrome ash content NCh1206 – max 2.0%

▷ Grease content NCh1203 – min 5%

 

Additional guidance is provided for lining and tongue material properties according to

NCh773/1 to be agreed between parties

▷ Thickness NCh139 – 1mm

▷ Tear strength NCh622 – min 18N/mm

▷ pH NCh1791 – min 3.5

 

Additional guidance is provided for leather insole properties according to NCh773/1 to be

agreed between parties

▷ Thickness NCh139 – 2.5mm

▷ Taber abrasion resistance NCh773/2 – max 1300mg

▷ Tear strength NCh622 – min 30N/mm

▷ pH NCh1791 – min 3.5

 

NCh772/2 (toe cap and nail penetration plates)

• Toe cap dimensional requirements

• Impact NCh773/4 – EN style striker and mass dropped from 700mm so roughly 140J impact energy, range of minimum clearances for bare cap testing from 20mm in size 38 and below to 22.5 in sizes above 46

• Corrosion resistance NCh773/3 – 1% salt solution, paper strips, 48 hours – no more than 5 areas of corrosion none more than 2.5 sq mm

• Steel anti pen plate corrosion – similar test and requirements

• Anti pen plate dimensional conformity – no gap larger than 6.5mm around edge of plate to edge of insole

• Nail penetration – NCh1797 – penetration resistance minimum 1100N

 

Outsoles NCh1350

• Thickness

▷ Min 4mm base thickness

▷ Min 2.5mm lug height

▷ Min 6mm if no lugs

• Tensile strength NCh1834 – min 10MPa

▷ Max 20% change after aging 48 hours at 70°C

• Tensile elongation NCh 1834 – min 300%

▷ Max 20% change after aging 48 hours at 70°C

• Din abrasion ISO 4649

▷ Max 250 cubic mm for density 0.9 g/cc or less

▷ Max 150 cubic mm for density >0.9 g/cc

• Tear strength NCh1351/1 – min 29.4 kN/m

• Hardness NCh1832 – 60 to 80 Shore A

• Hydrolysis of polyurethane NCh1351/2 – treatment followed by Ross flex max 6mm cut growth

• Interlayer bond strength EN344 - min 4.0 N/mm

• Fuel Oil resistance NCh1351/2 – max 12% swell

▷ If shrinkage is found the n treatment and Ross flex

• Color identification 1cm diameter dots in waist area

▷ Yellow – general safety and occupation footwear

▷ Red – footwear with fuel oil resistant outsoles

▷ Green –antistatic or semiconductor footwear

▷ Blue – Insulating footwear

 

NCh2147/1 Antistatic Footwear

• General design and manufacture

▷ Surface area of ground contact for the heel – min 256 sq mm

▷ No metallic outer parts that are of ferrous metal

▷ Safety toe cap design and manufacture according to NCh772/2

▷ Samples for testing must comply with NCh772/1

• 500V test

• Resistance must be between 0 and 500,000 Ohm

• Electrode - 2.3kg mass, 54mm diameter with bottom covered with 6.35mm rubber (40

to 60 Shore A) entire assembly wrapped in metal foil

• Place electrode in heel of footwear, place footwear on metal base electrode plate

• Apply the voltage (500V)

Determine the Voltage and Current flowing through the footwear or read resistance directly

 

• Marking

▷ Green dot 1cm diameter on waist of outsole

▷‘Antiestático’ branded on the upper in the ‘faxing area’

▷ Additional information must be provided in Spanish

 

 

NCh2147/2 Electrically Insulated Footwear

• General design and manufacture

▷ Not clear but may not allow stitches that pass through the sole

▷ Must not have metallic parts in outer layers of the footwear

▷ Must comply with NCh772/1

▷ Current leakage test

• 14,000 Volt for one hour – max leakage 5.0mA

• Inner electrode a mass of 2.3kg wrapped in metal foil that will make contact with at

least 65% of the insole surface

• Pieces of blotting paper soaked in 1% salt solution that will cover at least 65% of the

insole surface, ensure no contact with upper or lining

• Leave for 5 minutes and then insert inner electrode

 

• Marking

▷ Blue dot 1cm in diameter on waist of outsole

▷‘Aislante’ branded on the upper in the ‘faxing area’

▷  Additional information must be provided in Spanish

 

 

Ch2147/3 Semiconductor (Conductive) Footwear

• General design and manufacture

▷ Surface area of ground contact for the heel – min 256 sq mm

▷ No metallic outer parts that are of ferrous metal

▷ Safety toe cap design and manufacture according to NCh772/2

▷ A conductive strap must be provided in the footwear that connects to the wearer’s calf skin

▷ Samples for testing must comply with NCh772/1

• 500V test

• Maximum resistance 10,000 Ohm

• Electrode - 2.3kg mass, 54mm diameter with bottom covered with 6.35mm rubber (40

to 60 Shore A) entire assembly wrapped in metal foil

• Cover insole of footwear with insulating material of thickness 6.35mm

• Place electrode in heel of footwear, place footwear on metal base electrode plate

• Apply the voltage (500V)

• Determine the Voltage and Current flowing through the footwear or read resistance directly

 

 

• Marking

▷ Green dot 1cm diameter on waist of outsole

▷ "Semiconductor" branded on the upper in the ‘faxing area’

▷ Additional information must be provided in Spanish