“ASTM D1337-10 Standard practice for storage life of adhesives by viscosity and bond strength” developed by the American Society for Testing and Materials (ASTM) describes a laboratory method by which the storage life of an adhesive can be measured using viscosity, bond strength, or a combination thereof. This standard can be used to determine the storage life of any adhesive where this information is required.
This application is intended to determine, through viscosity tests (Procedure A) or adhesion strength tests (Procedure B), or both, whether the storage life complies with the minimum specified storage life required for an adhesive. It does this by providing before and after results under a set of standard conditions that simulate storage life. Determination of requirements for the percentage of the original property retained or the minimum value of a property is found in the relevant material specification or as agreed between the manufacturer and the user.
Each adhesive product has a shelf life of approximately 1-2 years, depending on production date, storage conditions and when opened. The environment in which a roll of tape is stored often determines its usability and adhesive shelf life. For example, a sealed, fully packaged roll left on the shelf for a year may be in better condition than an unsealed roll left outside for a month. Different facilities have different standards for storing adhesive. Therefore, it is necessary to ensure that the adhesive is stored in a temperature and humidity controlled environment.
Temperature is the most important factor to consider for storing an adhesive. The correct storage temperature depends on the adhesive itself, the technical data sheet tells you at what temperature the adhesive should be stored. Some adhesives are less sensitive to temperature changes than others. However, in general, adhesives should be stored between 15 and 25 degrees. Adhesives stored at temperatures below recommended begin to crystallize. Additionally, one-component adhesives become more viscous when cold. On the other hand, adhesives stored at temperatures above recommended will lose performance. High temperatures are more likely to cause damage than lower temperatures.
Adhesive strength is the interfacial strength between the adhesive and the substrate and is often the most important consideration when designing a strong adhesive bonded assembly. However, adhesion strength is not the only factor critical to creating an effective bond. Even when using the world's hardest adhesive, bonding will fail if the adhesive does not adhere to the surface of the substrate.
Cohesive strength is the internal strength of an adhesive, that is, the ability of the adhesive to hold itself together under stress. The higher the cohesive force, the stronger the adhesive. Cohesion strength is determined by the chemical composition of the adhesive. Adhesives range in strength from pressure-sensitive adhesives to structural epoxy and acrylic adhesives.
Substrate surface energy is important in adhesive selection. Surface energy is a physical property of the surface of a material that determines whether an adhesive will make close contact. On a material with high surface energy, the liquid wets or spreads over the surface, on a material with low surface energy, the liquid resists flowing and beads. An adhesive must wet the substrate to ensure a bond.
In this regard, the viscosity and bond strength of an adhesive are important in determining the storage life of the adhesive.
Among the numerous testing, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization, with its trained and expert staff and advanced technological equipment, provides testing services defined in the standard "ASTM D1337-10 Standard practice for the storage life of adhesives according to viscosity and bond strength". It also gives.
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