In many cases, the use of pressure sensitive and HATS adhesives can eliminate mechanical fastening systems (staples, nails or retaining clips), and the inherent problems associated with them, such as cost, weight, and breakage. PSA and HATS frequently improve productivity during the final assembly process by providing a faster, more efficient way of attaching seals and gaskets to the end product.
To begin the adhesive selection process, it is important to have the answers for several basic questions:
1. To what type of substrate will the adhesive be attached?
2. In what temperature range will the adhesive be expected to perform, and with what chemicals will it come into contact?
3. Will the adhesive come into contact with moisture or sunlight?
4. Will the adhesive be functional after installation?
The double coated paper and film tapes and the heat bonded tape systems each offer specific benefits depending upon the surfaces to be joined, the strength of the bond required, and environmental factors such as temperature and chemical resistance.
*Advantages: Acrylic adhesives are cross-linkable and deliver good resistance to varying temperature ranges, chemicals, ultraviolet light and oxidation. They are very color stable and can easily be removed and reinstalled in the application if done incorrectly.
*Disadvantages: Generally, they have poor adhesion to polyolefins. The initial bond or tack strength of acrylic adhesive is low.
*Advantages: Rubber based adhesives will adhere to a wide range of materials and they have a high initial "grab" or tack.
*Disadvantages: Poor resistance to elevated temperatures, fair to poor resistance to chemicals, and generally poor resistance to ultra violet light and oxidation.