Dutsen ulu shine kayan da aka fi amfani da su na zafin jiki a cikin ajiyar sanyi na jiragen ruwa.Babban albarkatunsa shine basalt.Fiber ce da aka yi ta hanyar centrifugation mai sauri bayan an narkar da shi a yanayin zafi mai zafi, kuma ana saka shi daidai gwargwado, mai hana ƙura da man silicone.Dutsen ulu yana warkewa kuma ana yanke shi a babban zafin jiki don samar da gashin ulu na dutse, tarkace, bututu, faranti, da dai sauransu, waɗanda ake amfani da su a cikin ajiyar sanyi, bango mara nauyi, rufi, rufi, benaye masu iyo, rukunin gida, da sauransu na jiragen ruwa.Dalilin da ya sa ake amfani da ulun dutsen a cikin jiragen ruwa ba kawai saboda mafi kyawun aikin da ake yi na zafi ba, amma har ma da kyaun sauti da kuma tsayayyar wuta, kuma mahimmanci, farashinsa yana da ƙasa.

Za a iya yin ulun gilashin zuwa samfura tare da mafi ƙanƙanta girma mai yawa a tsakanin kayan inorganic thermal insulation kayan.Saboda samfuran ulu na gilashi suna da haske a cikin girman girma kuma suna iya zama daidai da kayan kumfa.A matsayin kayan rufewar zafin fiber, ulun gilashi gabaɗaya ana amfani da shi don raba sassa kamar manyan kantuna, kofofi da tagogi, da sauran wuraren da ake buƙatar rigakafin wuta, rufin zafi da adana zafi.

Ƙunƙarar ulun gilashi mai ƙarancin ƙarfi yana da ƙarancin juriyar shigar harshen wuta, don haka ba a yarda a yi amfani da shi don rufewar zafi a cikin manyan kantunan Class A ko bene na jiragen ruwa.Gilashin ulu tare da yawa na 16 ~ 25kg / m3 za a iya amfani dashi azaman rufin zafi ko kayan adana sanyi don ɗakin da aka rufe bututun refrigeration tsarin;Gilashin ulu tare da nauyin 40 ~ 60kg / m3 za a iya amfani dashi azaman dakin zafin jiki don tsarin ruwan zafi / tsarin tururi da kuma buƙatun sanyi na musamman na kayan haɓaka kayan aiki na bututu na ruwa;saboda ƙananan ƙarancinsa kuma don rage nauyin jiragen ruwa, ana amfani da kayan ulu na gilashi a cikin jiragen ruwa na soja.

An fara samar da ulu na yumbu a cikin gida a cikin 1970s, wanda aka yi amfani da shi don bututun zafi tare da zafin jiki mafi girma a kan jiragen ruwa da kayan daɗaɗɗen zafi don ɗakunan da ke da ƙayyadaddun buƙatu don matakan juriya na wuta.A halin yanzu, kayan da ake amfani da su na hana wuta da ake amfani da su a kan jiragen ruwa daban-daban a gida da waje, galibi ulu ne na yumbu.

Ana amfani da kumfa polyurethane mai ƙarfi a cikin ginin ajiyar sanyi don jiragen ruwa mai nisa.Hanyoyin gine-gine sun kasu kashi-kashi zuwa hanyar feshi, hanyar turawa, hanyar haɗin gwiwa, da kuma hanyar allo mai haɗaka don ajiya kafin sanyaya.Ya kamata a lura da cewa, idan aka kwatanta da sauran kayan haɓakar thermal, kumfa polyurethane mai ƙarfi yana da ƙarancin juriya na wuta da ƙayyadaddun aikace-aikace.