Magnesium Hydroxide flame retardment has some characteristics of retarding fire,reducing smoke,cheap priceand safe stuff etc,therefore,it is applied widely.
Synthetic method of phosphoretted fire retarding agent - YHD was researched.The property and application technique together with its application result of flame retardant YHD were mentioned here.
" Retarded" was once a polite way of saying " feeble-minded" ; it was in long-standing clinical use before becoming a playground insult and, ultimately, deeply offensive.
There were no smock-frocks, even among the country folk; they retarded motion, and were apt to catch on machinery, and so the habit of wearing them had died out.