What phase of the sealant curing process refers to the time it takes for the curing sealant to lose stickiness to touch?

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The phase of the sealant curing process that refers to the duration in which the curing sealant loses its stickiness to touch is known as tack free time. During this period, the surface of the sealant begins to form a skin, becoming less adhesive and ultimately allowing for handling without transferring to other materials. This characteristic is important in various applications to ensure that the sealant can be worked with further or that other materials can be applied without residue or interference. Tack free time is a key consideration in the application of sealants, as it influences the rework schedule and the overall efficiency of assembly in aerospace manufacturing.

The other phases, while relevant, refer to different aspects of the curing process. Complete cure time is the total time needed for the sealant to achieve full hardness and performance specifications, gel time is the initial phase when the sealant starts to thicken, and setting time typically refers to the period when the material transitions from a wet to a stable state without defining the specific loss of tackiness.

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