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Product Testing Methods

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Zipper Testing Methods

There are various methods by which to evaluate zipper strength. The basic strength can be determined based on the results of the following inspection methods, from which overall strength appropriate for respective uses can be judged. (Based on JIS-S3015 and ASTM D2061)

Tensile Testing Machine Conditions

Tensile Speed: 300 mm/min, Clamp Width: 25 mm

Chain crosswise strength (per 2.5cm)

An engaged zipper chain is pulled crosswise as shown at a constant speed.

Top stop holding strength

The lower part of an engaged zipper is held securely, then the slider pulled to the top is pulled further up.

Bottom stop holding strength

The slider is pulled down to the bottom stop, and each side of the chain is pulled outwards in opposite directions.

Separating unit crosswise strength

The slider lock is engaged in the middle of a chain, then each side of the chain is pulled outwards in opposite directions.

Slider lock strength

The slider lock is engaged in the middle of a chain, then each side of the chain is pulled outwards in opposite directions.

Slider tab pull off strength (90 degree)

Tension force is applied to both the puller and the bottom of the body of an assembled slider.

In addition to the 90°angle shown, a 45°angle is also tested.
(Tensile Testing Machine Speed: 100 mm/min)

Plastic Hardware Testing Methods

Buckle tensile strength test

Strap adjuster tensile strength test

Wedge adjuster tensile strength test

D-Ring tensile strength test

Snap hook tensile strength test

Cord stopper tensile strength test

Hook & Loop Testing Methods

Durability Test

Strength of adhesion

Snap and Button Testing Method

Direct Pull Strength

Tack Button

A force is applied diametrically until the tack button separates from the tack or the fabric is torn. The force at separation is reported as the holding strength.

Peel Off Strength

Rivet & Burr, Snap, Eyelet & Washer

The lower part of an engaged zipper is held securely, then the slider pulled to the top is pulled further up.

Direct Pull Strength

SNAPET®

The slider is pulled down to the bottom stop, and each side of the chain is pulled outwards in opposite directions.

Lateral Strength

Hook & Eye

A force is applied diametrically until the tack button separates from the tack or the fabric is torn. The force at separation is reported as the holding strength.

Slippage Strength

SOFIX®

The lower part of an engaged zipper is held securely, then the slider pulled to the top is pulled further up.

Lateral Holding Strength

SOFIX®

The slider is pulled down to the bottom stop, and each side of the chain is pulled outwards in opposite directions.