A generic bulk product labeled and called only "red pepper" is sold very cheaply in most International Markets, Asian and Chinese grocery stores in US.
It is always a very finely ground red powder sold in 500g (and much larger) clear plastic pillow shaped bags that I can never use up. (Normal label just says Brand, "Red Pepper", weight.)
I think it can be used to make the hot flavors when preparing "Chinese" dishes and I use it to add "heat" to any "Chinese Food" that was not made spicy enough.
Careful, this dry power will make you sneeze and irritates the eyes more than finely ground black pepper. Sometimes without even opening it.
It contains it's seeds and is a bit hotter than any crushed red pepper used on Italian food. (Mostly because that "crushed" is more coarsely grated flakes than any coffee grind.)
Every decade or so when it turned brown, I searched for another market that didn't exist long enough for me to get it again.
I add 1/8 teaspoon to a 1 pound skillet dinner.
So, I only buy one of the smallest packages and repack it in a canning jar or a used spice dispenser container saved and washed from something mild enough to use up. (Like Italian seasoning)