The tubes are made from low emissivity borosilicate glass (glass with a very low iron content that has superior durability and heat resistance ) with an all-glass seal and they employ AL/N on AL selective coating, which enables the use of the whole solar energy spectrum to generate heat; this produces greater thermal efficiency in bright sunshine but also produces high efficiency in overcast or diffuse sunlight conditions. Further, the tubes are evacuated and have a barium getter (vacuum indicator) which changes color from silver to white if a tubes vacuum has been compromised.
An examination of the tubes shows that the outside is actually 2 layers of glass and a vacuum has been created between them. A good way to demonstrate this would be to fill an empty tube with very hot water and notice that it does not even get warm as you hold the tube in your hands. That is because of the thermos effect¡± created by having a vacuum between the layers of glass.
Carton with foam inside.
Decahydrate Borax
(Na2B4O7.10H2O)
CHEMICAL ANALYSIS
Component Unit Content
B2O3 % 36.47 min.
Purity % 99.90 min.
Na2O % 16.24 min.
SO4 ppm 70 max.
Cl ppm 50 max.
Fe ppm 10 max.
SIZE DISTRIBUTION
Size (mm) Unit Content
+ 1.000 % 1.00 max.
- 0.063 % 4.00 max.
50kg/bag 24Mton/20'FCL load without palletized
50kg/bag 24Mton/40'FCL load without palletized.
Boric Acid
(H3BO3)
Chemical Analysis
Component Unit Content
B2O3 % 56.25min
Purity % 99.90min
SO4 ppm 500max
Cl ppm 10max
Fe ppm 7max.
Size Distribution
Size Unit Content
+1.000 % 2.00max
-1.063 % 4.00max.
50kg/bag 24Mton/20'FCL load without palletized
50kg/bag 24Mton/40'FCL load without palletized.
Pentahydrate Borax
(Na2B4O7.5H2O)
CHEMICAL ANALYSIS
Component Unit Content
B2O3 % 48.00 min.
Na2O % 21.45 min.
SO4 ppm 136 max.
Cl ppm 70 max.
Fe ppm 3 max.
Insolubles in Water ppm 150 max.
SIZE DISTRIBUTION
Size (mm) Unit Content
+ 1.200 % 4.00 max.
- 0.075 % 5.00 max.
50kg/bag 24Mton/20'FCL load without palletized
50kg/bag 24Mton/40'FCL load without palletized.
