 Chemicals cause from 2 to 11 % of all burns and contribute to as many as 30 % of burn @-@ related deaths . Chemical burns can be caused by over 25 @,@ 000 substances , most of which are either a strong base ( 55 % ) or a strong acid ( 26 % ) . Most chemical burn deaths are secondary to ingestion . Common agents include : sulfuric acid as found in toilet cleaners , sodium hypochlorite as found in bleach , and halogenated hydrocarbons as found in paint remover , among others . Hydrofluoric acid can cause particularly deep burns that may not become symptomatic until some time after exposure . Formic acid may cause the breakdown of significant numbers of red blood cells . 
 Chemicals cause from 2 to 11 % of all burns and contribute to as many as 30 % of burn @-@ related deaths . Chemical burns can be caused by over 25 @,@ 000 substances , most of which <a href='drop_aux' title='1'><mark>are</mark></a>either a strong base ( 55 % ) or a strong acid ( 26 % ) . Most chemical burn deaths <a href='drop_aux' title='2'><mark>are</mark></a>secondary to ingestion . Common agents include : sulfuric acid as found in toilet cleaners , sodium hypochlorite as found in bleach , and halogenated hydrocarbons as found in paint remover , among others . Hydrofluoric acid can cause particularly deep burns <a href='null_relcl' title='3'><mark>that</mark></a>may not become symptomatic until <a href='None' title='4'><mark>some</mark></a><a href='negative_concord' title='5'><mark>time</mark></a> after exposure . Formic acid may cause the breakdown of significant numbers of red blood cells . 
Chemicals cause from 2 to 11 % of all burns and contribute to as many as 30 % of burn @-@ related deaths . Chemical burns can b caused by ova 25 @,@ 000 substances , most of which either a strong base ( 55 % ) or a strong acid ( 26 % ) . Most chemical burn deaths secondary to ingestion . Common agents include : sulfuric acid as found in toilet cleaners , sodium hypochlorite as found in bleach , and halogenated hydrocarbons as found in paint remover , among others . Hydrofluoric acid can cause particularly deep burns may not become symptomatic until no time after exposure . Formic acid may cuz da breakdown of significant numbers of red blood cells .