XX content = content of XX?? I have this substance that is made from three different raw materials and I just want to refer to the raw materials as components A, B and C without saying what exactly they are, because the actual raw materials used can vary. Now, I want to say "This substance has a component A content of 20 percent by weight" (meaning the amount of component A contained in this substance represents 20 percent of its total weight) but the phrase "component A content" does not sound right to me. I tried "a content of component A of 20 percent" but again this is confusing because "content of XX" usually means what is contained in XX rather than the percentage of XX contained in something bigger. Does anyone have a better idea of how to phrase "This substance has a component A content of 20 percent by weight"? Here, I want use "this substance" as the subject and still come up with a natural sentence. Thank you