Where the external surface of those materials and components must be reflective, the reflective power must be appropriate to the intensity of the heat flux due to radiation in the infrared range.
Cé go gcaithfidh an dromchla seachtrach de na hábhair agus de na comhpháirteanna a bheith frithchaiteach, ní mór an chumhacht fhrithchaiteach bheith oiriúnach don dlús teasfhlosca mar thoradh ar radaíocht sa réimse infridhearg.