Is this safe for brake rotors and calipers

I'm not sure on that, but try a small spot, and see but I would asked your mechanic if it is, safe to use, Me personally I wouldn't

what is concentration of hydrophoric acid

http://www.loctiteproducts.com/p/s_trmt_naval/technical-data/Loctite-Naval-Jelly-Rust-Dissolver.htm This is a link to the MSDS for the product. The exact concentration of phosphoric acid is a trade secret, but it is between 10% and 30%.

ASIN	B000C014ZI
Amazon Bestseller	#73,960 in Automotive ( See Top 100 in Automotive ) #122 in Care Corrosion & Rust Inhibitors #1,838 in Oils & Fluids
Are Batteries Included	No
Brand	Loctite
Color	assorted
Date First Available	August 12, 2012
Included Components	Professional
Item Weight	45.4 g
Laser Class	Durable, fast-acting, water-soluble, sprayable, brushable
Material	other
Model Number	1381191
Name List for Name Plates	該当なし(N/A)
Power Source	Hand Power
Product Dimensions	141.3 x 141.3 x 361.29 cm; 45.36 g
Quantity	1
Wallpaper Pattern	Solid

Loctite Naval Jelly Rust Dissolver 16-fluid オンス (553472), 1381191

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