▁temper atures ▁produce ▁maximum ▁quantities ▁of ▁the ▁fo amed ▁product . ▁The ▁fo amed ▁mol ten ▁glass ▁breaks ▁into ▁gra vel ▁on ▁cool ing . ▁ ▁Us es ▁ ▁Fo am ▁glass ▁gra vel ▁has ▁a ▁wide ▁range ▁of ▁applications ▁across ▁construction ▁and ▁civil ▁engineering ▁projects ▁as ▁well ▁as ▁land sc aping ▁applications . ▁It ▁is ▁used ▁as ▁the ▁base ▁aggregate ▁in ▁the ▁construction ▁of ▁solid ▁flo ors ▁and ▁as ▁an ▁ins ulating ▁aggregate ▁for ▁base plates . ▁The ▁gra vel ▁is ▁self - inter lock ing ▁with ▁a ▁high ▁fr iction ▁angle ▁and ▁is ▁used ▁in ▁road ▁construction , ▁particularly ▁useful ▁in ▁areas ▁of ▁mar sh y ▁ground ▁or ▁per ma f rost ▁marg inal ▁zones ▁where ▁it ▁can ▁reduce ▁the ▁de grad ation ▁of ▁the ▁road ▁base . ▁It ▁can ▁be ▁used ▁to ▁ins ulate ▁under ground ▁t anks ▁or ▁pip es , ▁create ▁d rain age ▁b eds ▁and ▁French ▁( gra vel ) ▁dra ins . ▁ ▁References ▁ ▁Category : G lass ▁applications <0x0A> </s> ▁The ▁Horn castle ▁bo ar ' s ▁head ▁is ▁an ▁early ▁sevent h - century ▁Ang lo - S ax on ▁orn ament ▁dep ict ing ▁a ▁bo ar ▁that ▁probably ▁was ▁once ▁part ▁of ▁the ▁cr est ▁of ▁a ▁hel met . ▁It ▁was ▁discovered ▁in ▁ 2 0 0 2 ▁by ▁a ▁metal ▁det ector ist ▁searching ▁in ▁the ▁town ▁of ▁Horn castle , ▁Lincoln shire . ▁It ▁was ▁reported ▁as ▁found ▁tre asure ▁and ▁acquired ▁for ▁£ 1 5 ,