·         Diametru interior:

   37 mm *

   47 mm **

·         Lungime: 1500 mm * , 1800 mm **

·         Coeficient de absorbtie termica: >0,94

·         Coef. de pierderi: <0,8 watt/m

·         Absorbtia termica max. suportata: 270 gr C

·         Materialul sticlei: sticla yena borosilicate glass 33