Adhesive room-temperature setting

Adhesive, room-temperature setting—An adhesive that sets in the temperature range from 68°F to 86°F (20-30°C), in accordance with the limits for Standard Room Temperature specified in ASTM Methods D618. 

See also adhesive, hot-setting adhesive, inter-mediate temperature setting and adhesive, room temperature setting. 

Adhesive, Cold-Setting n An adhesive that sets at temperatures below 20°C (68°F) (See also Adhesive, Hot-Setting Adhesive, InterMediate Temperature Setting and Adhesive, Room Temperature Setting). 

Urea resin adhesives, by the use of the proper hardener, may be set either by heat or at room temperature. For room temperature curing, the hardener may be ammonium chloride, together with basic materials like calcium phosphate to neutralize excess acid that might damage the wood. Cold set or room temperature set adhesives are those that set satisfactorily at 20 —30°C, whereas a hot set adhesive generally means one that is set above 99 °C. 

Perry, H. A., Room Temperature Setting Adhesive for Metals and Plastics, Adhesion and Adhesive Fundamentals and Practice, J. E. Rutzler and R. L. Savage, eds., Society of Chemical Industry, London, 1954. 

Adhesive, room temperature n. An adhesive that sets in the temperature ranges of 20-30°C. 

Adhesives may also be classified by the way they are applied or cured. Hence, anaerobic adhesives are adhesives that set only in the absence of air, for instance, when confined between plates or sheets. A contact adhesive is one that is apparently dry to the touch but will adhere to itself instantaneously on contact (also called contact bond adhesive and dry bond adhesive). A heat-activated adhesive is a dry adhesive film that is made tacky or fluid by application of heat or heat and pressure to the assembly. A pressure-sensitive adhesive is a viscoelastic material that in solvent-free form remains permanently tacky. Such materials will adhere instantaneously to most solid surfaces with the application of very slight pressure. Room-temperature setting adhesives are those that set in the temperature range of 20-30°C. These are usually two-component adhesives that must be mixed before application. A solvent adhesive is an adhesive that has a volatile organic liquid as a vehicle and sets or becomes tacky after the solvent has evaporated. A solvent-activated adhesive is a dry adhesive film that is rendered tacky just before use by applicafion of a solvent. 

Reactive liquid adhesives can be chemically cross-linked to form durable, three-dimensional molecular structures. These bind chemically and/or mechanically with the fabric surface to generate high joint strength. They are generally one-part elevated-temperarnre-setting or two-part room-temperature-setting polymer systems. However, one-part systems that cure at room temperature when in contact with the substrates are also available (e.g., cyanoacrylates). 

Adhesive, room-temperature and intermediate-temperature setting resin (phenol, resorcinol, and melamine base)... 

Advantages. Excellent adhesion to a variety of substrates including silicones, room temperature setting, and ease of use. 

Inserted and bonded with room temperature setting adhesive... 

Prototype railcars consisting of multi-materials were fabricated in the Jabotabek project. For instance, the frames were imld steel, the roof construction were painted mQd steel sheets, the front-end construction was FRP, the rear-end construction and the side construction were stainless steel. The side constructions were bonded to the frames with a two-part room temperature setting epoxy adhesive using positioning jigs. The cars have been in service for already 4 years. 

Perry HA. Room temperature setting adhesives for metals and plastics. In Rutzler JE, Savage RL, editors. Adhesion and adhesion fundamentals and practices. London Society of... 

Plasticizers soften the film and increase the adhesion and the setting speed. The most common are phthalates, adipates and benzoates. The amount added can be in a broad range of 10-50%. They affect the swelling and softening of the PVAc emulsion particles, ensure film formation at room temperature, and the tack of the still wet adhesive. They also provide improved moisture resistance of the bond. Disadvantages are the lower resistance of the bond line against heat, possible migration of the plasticizers and enhanced cold flow. 

The relative aggressiveness of the environments proved to be consistent for all substrates, with the room temperature control the least hostile (virtually no loss of adhesion), and the cycle tests the most aggressive (up to 100% loss of adhesion within 60 days). Humidity cabinet exposure and 60°C water immersion yielded very similar values. As a result, for reasons of clarity, only water immersion data is actually presented here. Joint strength data obtained from either the Ford APG or Fisher Body Cycle Tests were identical, and were therefore also represented by one set of data points. The relative aggressiveness of the host environments toward... 

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