Scoville Heat Units (SHU) is how the pepper sprays hotness is rated has been around for many years, since 1912 to be exact!  Pepper sprays overall effectiveness depends on the Scoville Heat Units.  Self Defense Sprays have to be at 2 million SHU in order for them to properly work on your attacker.Pepper Sprays Oleoresin Capsicum will cause eye tearing profusely, possible temporary blindness, massive coughing and difficulty breathing. Self Defense Sprays will take your attacker down and cause a lot of pain. Self Defense Sprays are extremely reliable in its affects on individuals who may be drug or alcohol induced while other forms of self defense weapons will not.  Self Defense Sprays come in different strengths, usually between 10% and 18%.  This is definitely enough to warrant someone who has been sprayed to feel the hurting affe guitar chords cts and will last up to 45 minutes allowing you time to escape to safety.  The worst you can do is stay with the attacker after using your pepper spray.  Get the job done and get out of there immediately. The Oleoresin Capsicum is derived from oil and doesn’t mix very well with water.  The last thing you want to do if sprayed is just let the eyes naturally tear to cleanse it out.  Do not touch the affected area with your hands and then touch yourself elsewhere as it will end up all over you. If you should get it onto other parts of the body you will feel burn sensations and could lead to blisters, this can last for hours.Self Defense Sprays come in a large variety of styles, from what looks like an ordinary pen to a compact lipstick you can easily carry in a pocket or purse, a stylish ring or as a one pound canister for your home.