FAQ(Frequently Asked Questions)

How is adhesive tape tested?
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Methods of testing adhesive tape vary according to its use and feature, and there are 3 typical methods such as adhesiveness, initial adhesiveness and sustainabilty.
Adhesiveness tests the power that a tape provides when attached and detached, in other specific words, ”180° pull-it-up adhesiveness.”
The most common testing method is to investigate a strength recorded when detaching a sample tape, at the degree of 180°, which is adhered on the surface of a material, as shown in the figure below.
For more information please refer to KSA1107, and the brief testing method is as follows: 1) Prepare a surface to be adhered that is made of stainless 304 hair line panel; 2) Roll it back once using rubber roller when adhering; 3) Leave it for more than 30 minutes at a normal temperature and moisture; and 4) Conduct a test as shown in the left figure.

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Initial adhesiveness (Track)
It is the power that provides a transient stickiness even when a light pressure is applied. There are 3 measuring methods such as a ball track, quick stick and probe tack. At first, ball tack is generally used in Japan as follows: 1) A steel ball rolls 100 m long along a slope of 30° 2) The steel ball stops between 30 mm ¡­ 70 mm from adhesive sector by passing through an exposed surface; and 3) Then, the number of the steel ball is a strength of the ball tack.
The number is defined in such a way that a steel ball of 1/32 inches in diameter is
specified as #1, that of 2/32 inch is #2……., that of 32/32 inch is #32.

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Quick stick
It is evaluated by a value earned when pressing adhesive tape using a small amount of pressure and detaching the tape at an angle of 90¡Æ. This measurement has the advantage of evaluating a regular deformity or destruction while it has the disadvantage that obtained value depends on a support substance and that a rate of change varies according to the time elapsed while adhesive tape sticks on the surface of a material.

Probe Tack
It indicates and measures the power provided when a stainless cylinder pole of the size defined in using, as it is, the strength of the power read in an exclusive test equipment reaches and detaches adhesive surface by a constant power. Compared to ball tack, its objectivity is good but it requires an expensive equipment.
Cohesion
It is a method of evaluating a falling time or pushed distance by attaching a certain area to a defined substance to be adhered and applying a load on its edge.
Generally, it is described as sustainability or holding power and conducted by designating temperature of a space tested for measuring thermostability.

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What is the difference between viscous agent and adhesive agent?
Viscosity and adhesion are similar each other but have not a little different characteristics. Both of them are called adhesive in the western countries while identified in Japan as well as Korea. Adhesive agent is intended for an everlasting attachment between surfaces by elevating adhesive intensity through such a change from liquid to solid.
Viscous agent is an intermediate substance containing both liquid and solid characteristics; it shows high viscous type and feature when attaching to a material and looks like a solid when detaching. That is, viscous agent can be defined in such a way that it is neither a liquid nor a solid but a transient and strong fixing substance.

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What is UL94V-0?
UL is short for Underwriters Laboratories, a non-profit independent private security institute which performs various tests such as material, equipment, structure, method, etc that have effects on personal life and assets. One of the grades displaying a degree of flammability evaluated by this institute, is UL94, which is divided into UL94HB and UL94V and assorted with V-2, V-1, V-0 and 5V by a degree of flammability.
Testing method of UL94V-0 can be briefly described as follows: 1) Install a sample tape vertically; 2) Light a fire for 10 seconds using a burner; 3) The fire of the sample should go out within 10 minutes when removing the burner; and 4) Prepare a set of 5 tape samples to conduct the same test 10 times, and its total burning time may not exceed 50 seconds.

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In addition, a spark falling down when burning should not ignite absorbent cotton located at floor. DAEHYUN has applied flammability equivalent to UL94V-0 to thermo-adhesive film for FFC (Flexible Flat Cable), started, in 1994 for the first time in Korea, a mass production of environmental-friendly non-halogen typed products that do not use the existing halogen flammable substances, and obtained the certification of UL for the said product.

 

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