Cov khoom siv cua sov, tseem hu ua tshav kub thaj ua rau thaj, yog cov cuab yeej ua kom sov uas hloov cov tshuaj siv hluav taws xob mus rau hauv tshav kub los ntawm kev ua kom nrawm oxidation cov tshuaj tiv thaiv hauv lub cell galvanic. Lawv cov khoom siv cua sov yog tsim los ntawm cov hmoov hlau hmoov, cov pa roj carbon activated, vermiculite, inorganic ntsev, thiab dej. Tom qab tshem tawm txheej txheej gelatin, nws reacts nrog oxygen kom tso cua sov. Vermiculite ua raws li cov khoom siv insulating, tswj qhov kub nruab nrab ntawm 52℃rau 8-18 teev. Cov poj niam cev xeeb tub thiab cov me nyuam mos yog cov uas yuav tsum tsis txhob siv cov khoom no.
Cov khoom no tau tsim nyob rau hauv Nyij Pooj xyoo 1970s thiab ua kom muaj cua sov autonomously yam tsis xav tau hluav taws xob, hluav taws xob, dej, lossis lwm yam khoom siv hluav taws xob. Loj - nplai ntau lawm tau pib hauv Suav lag luam hauv xyoo 2006, thiab los ntawm 2008, cov khoom tsim tawm txhua xyoo hauv tsev tau mus txog 181 lab thaj ua rau thaj. Raws li lub teeb kev lag luam tus qauv "Heating Patches" (QB/T 4903-2016), qhov siab tshaj plaws ntawm cov cua sov thaj ua rau thaj yuav tsum tsis pub tshaj 70 degree, qhov nruab nrab kub yuav tsum tsis txhob qis dua 48 degree, thiab lub sij hawm ntawm lub tshav kub tsim yuav tsum tau qhia meej meej nyob rau hauv cov khoom ntim. Lawv yuav tsum tau siv rau sab nraud ntawm cov khaub ncaws, tsis txhob sib chwv ncaj qha rau ntawm daim tawv nqaij kom tsis txhob muaj qhov kub thiab txias; kev sib cuag nrog kub nyob ze 60℃rau ntau tshaj 5 feeb tuaj yeem ua rau kub hnyiab.
Lub hauv paus ntsiab lus ntawm cov cua sov ntawm cov cua sov yog cov tshuaj tiv thaiv oxidation: hlau hmoov reacts nrog oxygen thiab dej los tsim ferrous hydroxide, uas yog thaum kawg hloov mus rau hauv hlau oxide thiab dej. Vermiculite thiab cov pa roj carbon activated ua haujlwm ua ke kom tawg cov hmoov hlau, tiv thaiv kom sov sai thiab tawv nqaij. Kev kuaj mob qhia tau tias nws tuaj yeem txo qhov mob pob qij txha thiab mob khaub thuas. Kev sim cov ntaub ntawv qhia tau hais tias tom qab qhwv lub qe nyoos nrog lub tshuab cua sov rau 5 teev, qhov kub sab hauv tuaj yeem ncav cuag 67.3 degree. Cov khoom no yog tswj raws li kev lag luam niaj hnub tsim nyog, thiab muaj qhov sib txawv ntawm kev tswj xyuas zoo piv rau cov kub compresses tswj raws li Class II kho mob. Thaum siv kom raug, tsis muaj teeb meem carcinogenic, tab sis kub hnyiab yuav tsum tiv thaiv.