The above information is not contained in the MSDS. It is in the product data sheet. MSDS only contains chemical properties, hazmat, fire information etc.
From the product data sheet for SCS1200:
"Construction SCS1200 silicone sealant is not recommended for use
on submerged joints, especially where porous substrates permit
water infiltration to the bond interface. However, effective aquarium
applications are being accomplished. Consult GE Technical Centers
for details.
....
WHEN SILICONE SEALANTS ARE USED IN REMEDIAL WORK,
ALL OLD SEALANT MUST BE REMOVED" (caps original format)
From conversation with GE Silicones in 2004, the most common silicone used by aquarium builders were RTV100 series, and IS800 series.
From conversation with Momentive in 2009, the most common silicone used by aquarium builders were RTV100 series, and IS800 series.
SCS1200 series, RTV100 series, IS800 series, DC732 and DC999A are all FDA approved for food contact. DC795 is not FDA approved.
Tensile strength for SCS1200 is 470 psi, peel strength (adhesion -- how well it sticks) is 40lbs/in. RTV100 series is 400 psi, peel is 40 lbs/in. The peel strength is the more important property, and they are identical, so it really comes down to which one is easier to get, in the quantity that you require.
There really is not a fight when discussing the "good stuff", only when consumer grade silicones, such as GE Silicone I and II, come into play with tank building, and aquarium use. They are not suitable for the task.
Jim
