① Regardless of the state it is in, it should be in a liquid state during application.
② It should be able to fully spread and wet the surface of the adherend.
③ It must be able to convert from a liquid to a solid or gel state through some means, forming a tough and stable adhesive layer.
④ After curing, it should have a certain degree of strength, be able to connect reliably, transfer stress, and resist damage.
⑤ It can withstand temperatures above 0℃ and stand the test for a certain period of time.