Filin kwalba, wanda kuma aka sani da filin jirgin ruwa, wani nau'in farar fata ne wanda ke nufin ragowar da aka bari bayan distillation da sarrafa asusun kwal don cire guntun ruwa. Gabaɗaya ne mai santsi, Semi-m ko m, baƙar fata a cikin kusan kashi 92% ~ 9% ~ 5% ~ 5%.
Babban abubuwan da aka haɗa na filin jirgin ruwan kwal ne da polycycic mai ƙanshi na polycycicky hydrocarbons da abubuwan da suka dace. Takamaiman haka hadaddun abubuwa ne sosai, kuma bambance-bambance a cikin nau'ikan ruwan hay da dabarun sarrafawa na iya haifar da bambance-bambance a cikin abun da ke ciki. Hanyar da ta yanzu ta bambanta dangane da zafin jiki da yake nunawa.
Carfin kwalba yana da halaye masu zuwa:
A cewar maki daban-daban, filin wasan kwalba zai iya kasu kashi uku: Fasa-zazzage-zazzabi, da kuma filin zazzabi, kowanne yana da maki biyu: kowannensu yana da maki biyu: kowannensu yana da maki biyu.
A lokacin da amfani da filin jirgin ruwan din, ya kamata a biya hankali ga masu guba don gujewa lahani ga lafiyar ɗan adam, kuma ya kamata kuma a dauki cutarwa ga lafiyar mutane da muhalli yayin samarwa da amfani.