Controlling the temperature could be performed by electromagnetic induction heating, which can heat up the mold from 110 ℃ to 200 ℃ in only 4 seconds . By using a proper coolant, the cooling time also takes only 20 seconds to reach 110 ℃ again . Another way to heat the mold is to use steam at a temperature of 180 ℃, which can increase the temperature in injection molding from 30 ℃ to 140 ℃ in 20 seconds . Water can be used in this approach to cool down the mold and solidify the injected polymer. CO2 lasers have also been used to heat the injected resin .