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VOSI - Public Safety Standard V41.23

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VOSI - Public Safety V41.23 Standards Review Page

VOSI V41.23 PUBLIC SAFETY UNIVERSAL SPECIFICATION/TEST METHOD
FOR
FOOTWEAR HEEL ATTACHMENT STRENGTH

1. SCOPE

1.1 To establish a test method (tensile test) for measuring the breaking strength of footwear heels.

1.2 To establish minimum strength requirements regardless of heel height.

2. REFERENCED DOCUMENTS

2.1 ASTM F694, Heel Attachment Strength Test for Women’s Shoes.

2.2. Proposed Standard Test Method for Heel – Attaching Strength of Footwear, (ASTM Subcommittee F13.2 on Biomechanics and Footwear Construction, 11-2000).

2.3 SATRA PM113, Heel Attachment Strength (SATRA Technology Center, Ketering, Northhamptonshire, NN169JH, UK, admin@satra.co.uk).

3. TERMINOLOGY

3.1 Heel Breast – the front face of the shoe heel.

3.2 Heel Height – the perpendicular distance from the top back edge of the heel to the plane of the tread (wear) surface.

3.3 Outsole – The bottom (sole) of the shoe: including the surface that is exposed to wear.

3.4 Top Piece (toplift) – the bottom layer of a heel usually made of leather, rubber, plastic, etc.

4. TEST METHOD

4.1 Use a tensile testing machine with a 2-in/min (5 cm/min) traverse rate (ref. 2.2) and autographic recorder.

4.2 Drill a 3/16 in (4.76 mm) diameter hole 3/8 of an inch above the top piece wear surface and midway between the breast and the rear surface of the heel (through the side of the heel).

4.3 Use a suitable U-shaped strap and push a #10 machine screw (0.190-in. diam.) through both the strap and the heel and secure with a nut and washer.

4.4 Connect the strap to the upper jaw of the tensile testing machine.

4.5 Clamp the front of the shoe in the lower jaw, and determine the breaking strength. 

4.6 Minimum required breaking strength 125-lb. (556N) (ref. 2.3: 500N (112 lb.))

5. SIGNIFICANCE & USE

5.1 The high and often narrow heel of womens shoes frequently break and cause women to fall and become injured.

5.2 This test method will establish a minimum required breaking strength for womens heels to minimize the number of injuries caused by heels that fail during walking.

5.3 Footwear manufacturers must use a heel/outsole attachment method that will resist the heel attachment torque produced by the 500 Newton breaking strength times the distance of the heel height minus the 3/8-inch heel tensile test attachment distance.

5.4 Users of the ref. 2.1 test method, which applies a torque to break the heel/insole attachment, have a 250 in. lb. minimum torque requirement. This is equivalent to the 125-lb. (556N) minimum tensile test breaking force applied to a 2" high heel. Heel heights greater than 2" require the same breaking force, therefore the required torque is greater than the ref. 2.1 250 in lbs.

5.5 Footwear manufacturers must be able to provide minimum heel breaking test certification for womens shoes (per V41.23) having heel heights greater than l" (2.5 cm)

6. KEYWORDS

6.1 Womens Heels, Tensile Test, Heel Breaking Strength, Heel Attachment Torque

This Universal Specification/Test Method is under the jurisdiction of Voices of Safety International (VOSI) Committee V41.20 on "Pedestrian Slip Resistance Requirements for Walkways & Footwear".

Copies are available from VOSI, 264 Park Ave., N. Caldwell, NJ 07006, PH (973) 228-2258, Fax –0276, e-mail: dcmeserlian@voicesofsafety.com

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Created: 2000-12-01 Last Updated: 2000-12-14