#6- What are the differences between Keratin, Brazilian straightening and Semi-Permanent Straightening(SP-S)?

They're all the same. Just different names.
All of the Keratin treatments, Brazilian Treatments, SP-S etc, follow the general format given below:
1.Treatment solution is applied to clarified and towel dried/or blown dry hair.
2.let to sit from 0-60 minutes to absorb
3.blown dry completely
4.flat ironed at @350-450 degrees, or blow out with a blow dryer and round brush for shorter lasting results.
5.not neutralized.
6.Smooth out frizz and curl to various degrees.
7.contains some precursor ingredient to a polymer
8.cost @$250-360 wholesale for @32-33oz bottle of solution.
9. 0-4 day waiting period before 1st wash, after treatment.
10.Treatment takes @ 1.5-5 hours depending on thickness, length, dry timing, number of stylists working on a client.
11.Going price is @150-450, which completely depends on stylist mark up. The various solutions cost about $8-11 per oz. and 1 treatment will use @1-4 oz/client depending on hair.
12.All companies we've seen so far say to only use products that are sodium chloride free, or sulfate free.
13.These treatments do not break bonds within the hair, they over ride the bonds. The effects are usually not permanent and usually wear off in 1-4 months depending on which product is used. The coating adds shine in general.
14.These treatments can be done over all other chemical treatments including Sodium Hydroxide products, Thio products, and color services.
15.These products hit the market in @2007, in America.

If the product you're looking to use, generally follows the above guidelines, then we lump them into the Keratin/SP-S category. The reason for the term "Brazilian" is because the technology of over riding bonds instead of breaking them, seems to have been made popular in Brazil.