PIT2SD, a 2-mil double-sided polyimide tape is often used to mount wafers on a carrier for through wafer etching and it works very well.

For more information about polyimide tapes or any other of our products, visit us or contact us for more details.

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In the production of lead acid gel batteries for automobile and transportation sectors, gases such as H2 and O2 can be emitted. The emission of these gases by such batteries when charging or discharging can be controlled by sealing the top battery with an electrical resistant foil or film. For example, PIT5N (Polyimide) exhibits a high breakdown voltage, depending upon the film thickness. This material can be used to seal the valves, which would not protect the emission but would lower the rate of battery detonation, due to delocalized electrostatic discharge by the Polyimide film.

For each battery, a thin strip of film or tape is required to reduce these charges. These films are required for specific battery applications, where vicinity charges are higher.

For more information about polyimide tapes or any other of our products, visit us or contact us for more details.

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Certification Classification

For tapes and other thin materials, the certification classification typically used is UL94 VTM-0. The UL94 V-0 code is used for a self supporting material. The problem that arises with a very thin material is that it may not burn but it will shrink or distort as the flame is directed to the sample and if it cannot withstand a ten second application before in shrinks to the holding clamp, so it will not be classified as a 94V material. Cases like this are what UL 94VTM is used for. You take a sheet 200mm X 50m and form a cone with it to perform the flame test as shown in the figure.  Many thin materials that will not burn but will shrink to the clamp and need VTM testing.

Vertical Testing of Thin Materials (VTM-0, VTM-1, VTM-2)

This test is used for materials that are thin, or are too flexible or may distort, shrink or flex during ordinary vertical testing. Procedure: An 8×2 in specimen is rolled longitudinally around a 1/2 in diameter mandrel and taped on one end. When the mandrel is removed the specimen forms a cone. The cone is supported in a vertical position and a flame is applied to the bottom of the specimen. The flame is applied for three seconds and then removed until flaming stops at which time the flame is reapplied for another three seconds and then removed. Two sets of five specimens are tested. The two sets are conditioned under different conditions.

Vertical Flame Test for Thin Materials

For more information of UL classification or polyimide tapes, visit us or contact us for more details.

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The Usual Suspects

Generally speaking, manufacturers use three different adhesive types in combination with the backing material to produce a final “tape” product. Though these adhesive types can be subdivided into subgroups, the main categories are as follows:

1. Silicone
2. Acrylic
3. Rubber

Each of these adhesive types have advantages and disadvantages which make them more or less suitable for particular applications. Here we will draw the major lines outlining these differences.

Silicone adhesives

Silicones have been used to formulate adhesive products for decades due to their flexibility, temperature cycling resistance, chemical resistance, and wide range of possible material properties.

Silicone adhesives have the following general characteristics:

• High flexibility (low modulus) at sub-ambient temperature
• Consistent performance over wide temperature range (a reason they work so well with Polyimide Tapes)
• Excellent ageing and UV resistance (a reason they work so well in LED applications)
• High temperature resistance
• Good resistance to polar solvents

Compared to acrylic and rubber adhesives, they are significantly more expensive, but due to their excellent high temperature performance they are very well suited to splicing tapes, masking tapes and polyimide (Kapton) tapes.

Acrylic Adhesives

Acrylic adhesives can either be water-based (this is also referred to as emulsion or dispersion) or solvent-based. Water-based are slower drying compared to solvent-based systems but generally solvent-based acrylic systems have better resistance to other solvents, chemicals and water. Comparatively, water-based systems are less expensive than their solvent-based counter parts.

Acrylic adhesives are generally divided into two subgroups: Pure and Modified

Pure acrylic
Pure acrylic adhesives share the following characteristics:

• Reasonable adhesion to a wide range of substrates (see modified acrylics below)
• Good ageing, transmittance and UV resistance (a reason they are often used in fiberoptic applications
• Reasonable temperature resistance; between silicones (high resistance) and rubber (low resistance)

Pure acrylics have a lower tack (“stickyness when dry” for the layman) and less adhesion on hard-to-bond plastics such as high- and low-density polyethylene (HDPE & LDPE) and polypropylene (PP) than modified acrylic or rubber adhesives. Pure acrylic adhesives are mainly used on tapes whose applications are bonding, sealing or surface protection.

Modified acrylic
For all intents and purposes, modified acrylics have the same characteristics as pure acrylics, but have superior adhesion to the hard-to-bond-plastics mentioned above. Generally, these are more expensive than pure acrylics and are used for plastic bonding (including vinyl and linoleum), lamination and splicing.

Rubber Adhesives

Just from looking at the roll, it is very hard to tell what type of rubber is used on the tape. Look at the figure to the right, and this same picture can be used to describe every type of rubber-tape below. The key is to ask the supplier what type of rubber adhesive is used. Like acrylics, rubber adhesives can be divided into two subgroups: Natural and Synthetic

Natural rubber
These adhesive have higher tack (again “stickyness when dry” for the layman) than acrylic adhesives as well as higher shear strength but they have limited UV resistance. These are used in the cheapest tapes on the market, but have limited applications. Natural rubber adhesives are used in duct tapes, low-temperature masking tapes and surface protection tapes (think of the tape you get on your new fridge or stove).

Synthetic rubber
As the name implies, synthetic rubber is “formulated rubber” – think coming from the lab, not coming from the tree. Synthetic rubber can broken into three subgroups: Hot-melt, Solvent and Butyl rubber.

Hot-melt rubber

Hot-melt is a low-temperature melting plastic, which makes this adhesive have low temperature resistance. It also ages poorly (becoming brittle) and has low UV resistance. This rubber is used for low- to medium-duty carton sealing, low-temperature splicing as well as paper core starting applications.

Solvent rubber

Solvent-rubber based adhesives have better temperature and aging performance but still poor UV resistance. It is used for electrical and foam tapes.

Butyl rubber

Butyl rubber based tapes have excellent UV and aging resistance but lower mechanical strength. These tapes are used in foam tape applications and construction and plumbing applications such as pipe joints.

Visit CAPLINQ.com today or ask us how we can help you select the right tape for your application.
tapes are mainly used for sealing applications in the building and construction industry. T

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