so its not powder,,it dosent make it stronger,it juust how it comes from the big drug dealers,usually with a stamp on the hash to identify where it came from.at least thats how ive seen it
you can buy a keif/hash press at any bigger tobbaco or peice shop. the main reason people do it is for re-sale and its a way to store it. doing so increases the weight and lowers the quality. hash from the US is garbage, better off finding some hash from the middle east or asia.
it would also make it harder for it to get ripped through by mold. if it's a tight block, it can't really grow through it very quickly, so it should store better