Anovak,
I did a little more research and there are a number of theads that talk to the 15-S-3 and 15-S-9 mixture, some referencing that this is what the Canadian Archivists use, and some saying that the mixture equals 15-S-7. Surfactants are classified by the HLB Scale: Hydrophilic-Lipophilic Balance. The 15-S-9 is rated 13.3 which classifies it as a detergent, and with its low surface tension, and not excessive foam height, and high cloud point should make it an excellent UT cleaning agent. 15-S-7 HLB is 12.1, and 15-S-3 is 8. When you blend 15-S-3 and 15-S-9, you get an emulsion with a HLB of 10.6, so this is not 15-S-7, so that rationale makes no sense. Otherwise, for the life of me, it makes no sense to clean a vinyl record with a blend of 15-S-3 and 15-S-9 that is an emulsion and can result in a cloudy solution, that decreases the effectiveness of the 15-S-9, and may inhibit rinsing. The only reason that you would add 15-S-3 to 15-S-9 would be as a defoaming agent. But UT cleaning should not cause a stable foam to develop, unlike if using a pumped parts washer. If you compare Triton X100 to 15-S-19, you will see similar HLB and surface tension 30 vs 33, but X100 can create a higher foam, and it is really intended for the metal cleaning industry where you are dealing with a lot of mineral based cutting oils and need the better oil emulsion properties, not some animal-fat based finger prints.
I did a little more research and there are a number of theads that talk to the 15-S-3 and 15-S-9 mixture, some referencing that this is what the Canadian Archivists use, and some saying that the mixture equals 15-S-7. Surfactants are classified by the HLB Scale: Hydrophilic-Lipophilic Balance. The 15-S-9 is rated 13.3 which classifies it as a detergent, and with its low surface tension, and not excessive foam height, and high cloud point should make it an excellent UT cleaning agent. 15-S-7 HLB is 12.1, and 15-S-3 is 8. When you blend 15-S-3 and 15-S-9, you get an emulsion with a HLB of 10.6, so this is not 15-S-7, so that rationale makes no sense. Otherwise, for the life of me, it makes no sense to clean a vinyl record with a blend of 15-S-3 and 15-S-9 that is an emulsion and can result in a cloudy solution, that decreases the effectiveness of the 15-S-9, and may inhibit rinsing. The only reason that you would add 15-S-3 to 15-S-9 would be as a defoaming agent. But UT cleaning should not cause a stable foam to develop, unlike if using a pumped parts washer. If you compare Triton X100 to 15-S-19, you will see similar HLB and surface tension 30 vs 33, but X100 can create a higher foam, and it is really intended for the metal cleaning industry where you are dealing with a lot of mineral based cutting oils and need the better oil emulsion properties, not some animal-fat based finger prints.