Potassium Silicate Coatings, Application of
|Publication Date:||28 October 2020|
This specification covers the detail requirements for the painting application of ceramic coatings used for thermal control or astronaut visual cue/part markings on space flight hardware. In general, these are two-part ceramic coatings with potassium silicate or hybrid potassium/sodium silicate binder, including Z-93P, Z-93SC55, Z-93C55, YB-71P, YB-71C, MH21:IP, MH11ZP, and MH55ICP made by Alion Sciences and AZ-93, AZW/ LA-II, AZ-2000-IECW, AZ-2100-IECW, ML-210-IB, RM-550-IB, AZ-1000-ECB, AMJ-400-IG, AMJ-600-IR, AMJ-700-IBU, AMJ-710-IBU, TMS-800-IY, and TMS-810-ICY made by AZ Technology. These coatings have flight history, either on hardware or as part of the Materials on International Space Station Experiment (MISSE). Other vendors of potassium silicate and hybrid silicate binder coatings may be considered. This document gives no recommendation, endorsement, or preference, either expressed or implied, concerning materials and vendors to be used.
This supersedes MSFC specification 10M01838, "Paint, Z-93 Temperature Control, Application of, Specification for". Refer to MSFC-PROC-1384 for silicone binder coatings and MSFC-PROC-547 for polyurethane binder coatings.
The process covered by this specification consists of the following classes. If a class is not specified, the method of thickness verification is optional and either Class I or Class II is acceptable.
a. Class I - This class is designated for spacecraft hardware with simple configuration where strict control of the coating thickness is not difficult.
b. Class II - This class is designated for spacecraft hardware with complex configuration where strict control of the coating thickness is not practicable.
c. Class III - This class is designated for spacecraft hardware being coated for the purpose of meeting esthetic requirements. Control samples for thermal emittance and solar absorptance are not required.
This standard applies the following: All mandatory actions (i.e., requirements) are denoted by statements containing the term, "shall." The terms: "may" or "can" denote discretionary privilege or permission; "should" denotes a good practice and is recommended, but not required; "will" denotes an expected outcome; and "are/is" denotes descriptive material.