a container having a container body , a thermic module at one end of the body , and a closure at the other end of the body initiates an internal exothermic chemical reaction to heat its contents when a user actuates the thermic module . a plastic thermic module body is spin - welded to a plastic container body by rotating one relative to and in contact with the other . the container body has multiple layers , including an inner layer such as a so - called oxygen barrier layer that inhibits oxidation and spoilage of the contents , and spin - welding the container body to the module body seals the otherwise - exposed oxygen barrier layer against air or moisture intrusion . the container includes a rotatable cover adhered to the container end over the closure with heat - sensitive adhesive that prevents a user from accessing the contents until a certain temperature is reached . the thermic module further includes a seal between an inner actuator button and an outer actuator button that seals the thermic module reactants against moisture intrusion prior to use , and is punctured when the thermic module is actuated . the thermic module may also include a filter disposed in interfering relation with the thermic module vents , including a portion between the inner and outer actuator buttons , to block egress of any particles of the solid reactant or the reaction product .