Pre seal cleaning
Low vapor pressure solvents evaporate slowly and can be easily trapped in cracks and faying joints. Seal will not stick to damp, solvent soaked surfaces. Solvent is not to be left to dry on the assembly but should be wiped dry with an approved clean rag before sealing per spec.
Removal of cured sealant from structure is difficult and leaves a stain that may or may not come off with the use of solvents. To eliminate time consuming cleaning operations down stream, it is recommended that excess and stray sealant be removed while the sealant is still wet with an approved solvent. MPK is a good low vapor pressure alternative for cleaning wet seal.
BAC 5000 Section 5 Qualified Solvents with vapor pressure less than 45 mm Hg
Note: Several of the cleaners are not allowed as the final clean prior to applying the sealant. Confirm vapor pressure with your supplier prior to use.
Solvents & Solvent Mixtures
Methyl Propyl Ketone (MPK)1,2
BMS 11-7 Type II1,2
Methyl Ethyl Ketone/sec-Butyl Alcohol blend2
Naphtha TT-N-95 Type 21
(vapor pressure varies)
Biogenic SE377C 2
Citra Safe 1,2
1-Also qualified to BAC 5030
2-Also qualified to BAC 5504