High temperatures up to 200 Р В Р вЂ Р РЋРЎв„ўР вЂ™Р’В¬ can be sustained by polyimide, silicone and PTFE tapes with suitable adhesives (silicone).Dimensional stability of polymer tapes is frequently poor under space conditions. Radiation has a tendency to harden polymers and render them brittle. Metals are not affected, although discoloration can occur when they are coated with a protective varnish. The best choice for UV resistance is polyimide or fluorinated resins.When the backing ismetallized on the side of the incident light, optical properties are quite stable. Radiation (UV and particle) shall be considered mainly when tapes are used for thermal-control purposes.Most polymer backings are sensitive and their solar absorptivity increases rapidly under irradiation.Practically each new type of tape shall be tested for outgassing: present results do not allow a generalized statement to bemade regarding safe tapes for space application, but acrylic adhesives seem to be the better choice. The release of such products, which are frequently plasticisers or tackifiers, can harden the adhesive layer and render it inoperative. Adhesives mainly generate condensable products which are dangerous contaminants for optics and electronics. Outgassing products and entrapped air can lift the tape or bubble it unless the tape is perforated. When the tape is applied, outgassing takes place through the backing by diffusion when it is permeable and also through the bond line. Vacuum exposure can draw products out of the backing when it is a polymer and also out of the adhesive.

Clean space material off gassing