I was looking around, thinking about a new knife and came across a Spyderco "rescue" which had a "hardened" point or tip to break glass. The action would be to grip the knife, with point at the heel of the hand and swing down somewhat like a hammer. Then i got to think, how hard is hard, because i usually carry a pair of pliers, and although they dont have a pointed end, i'm assuming with a hard enough swing, the glass should break, right ? The pliers are Channellocks and use 1080 steel with a hardness around the 54-56 rockwell, if my memory serves me.
You're right, I believe 'hardened' is just advertising hype. I assume you're talking about breaking auto glass in an emergency. You've seen it broken before. A pile of crumbled glass pebbles. No large, sharp shards. A focused strike with any hard object will shatter it.
Women and cats will do as they please, and men and dogs should relax and get use to it.
I'd like to try and see, need to find an abandoned truck or car and give it a go.
Hmmm let me think, i live in a city in the heart of the rust belt, which lost 10,000 people last year alone, the third highest poverty level in the country, 2nd worst inner city school rating in the country, and third in crime in the country.
I have an idea there is a car here or there i can bust the windows out of...which is sad
I watched this hoping he would try the Victorinox rescue Knife. I have one. Now I wonder? By the way hard is relative. Some metals are harder than others. It all depends on the alloys. As he said the graphite tip is harder.
It also depends on the glass. Autoglass is a special compound designed to resist normal road hazards, but shatter into little pieces with rounded edges that make it less dangerous in an accident. It can still cut you but not the way old auto glass, that broke into big sheets with knife edges did. the hardness of glass varies too, So whacking it with one tool may not break it but another tool might. Still it's good to have one of these in your kit.
It's just that i walk the city and surrounding "burbs" so much that i'm bound to walk into a situation where my assistance would be needed. As i think of it, i'm surprized that i haven't been in a crisis event by now. By all means i'm not looking for it, but if i could be helpful...