The role of molecular sieve in insulating glass
What is the ingredient of desiccant?
3A insulating glass (IG) desiccant is made from molecular sieve 3A. This IG desiccant can deeply co-adsorb resident moisture and organics in insulating glass, keep the IG clear and transparent even at very low outside temperature, prevent the condense of inside vapor. More importantly, it can resolve the problem of window distortion caused by IG inflation and shrinking under season or day-night temperature changing; this would prolong the life span of IG windows considerably.
What does it looks like?
Types of Desiccants
1. Silica Gel
2. Zeolites (Molecular Sieves)
Selection of suitable Desiccants
Adsorption Properties In IGU Conditions
Functions of the Desiccant in Insulating Glass
Desiccants have three functions
1) Adsorbing the moisture included during the manufacture of the IGU.
2) Second most important is to adsorb any off-gassed organics WITHOUT causing deflection
3) Adsorb moisture that permeates through the seal
Why insulating glass becomes shaped after production and installed?
Because of the pressure different inside insulating glass and outside insulating glass.
Correct Handling of the Desiccant
During IG Manufacture-Hang times No more than Four hours
Desiccation Loss in Hanging Spacers
_ Under roof
_ Bag/Super Sack: no exposure to UV radiation
Water Absorption Capacity
Desiccant Recommendation Based on Sealant Configuration
_ Hot Melt Butyl 3A or SiO2 Blend
_ Polyurethane 3A or SiO2 Blend
_ Polysulfide SiO2 Blend
_ PIB/PU 3A or SiO2 Blend
_ PIB/PS SiO2 Blend or 3A
_ PIB/Silicone SiO2 Blend or 3A
Supplier Quality Control
_Technical Support – Lifetime estimations, trouble shooting, hang time studies
The author here hopes to provide some information for insulating glass production, and please correct me if there is any mistake or wrong ideas. Jinan DETEK machine co., ltd, www.detekmachine.com