---
catalog: WEB-I3
catalog_name: Insulating Glass Fabrication Supplies
page: 25
sku_count: 0
generated_at: "2026-05-21T23:30:08Z"
---

# Insulating Glass Fabrication Supplies -- Page 25

## Page Content

FHC INSULATING GLASS FABRICATION, SUPPLIES AND EQUIPMENT
SECTION 3
IG23
Bulk Quantities Available
Click to Chat With Us
Insulating Glass
Visit fhc-usa.com to search for
Enter the Item Number or scan QR code with  
your smartphone for complete product details
FHC IG Terms and Definitions
Caulking Compound
A sealant with a relatively limited 
movement capability, typically less  
than 10%, is often referred to as a  
“low-movement sealant”.
Channel
A U-shaped opening in a sash or frame 
designed to accommodate glass or 
an insulating glass unit is commonly 
referred to as a “glazing channel” or 
“glazing groove”.
Channel Glazing
The process of sealing the joints around 
lites or panels placed in the channel 
using removable stops is commonly 
known as “channel glazing”. It involves 
sealing the gap between the glass and 
glazing stops to secure the glass or 
panels in place.
Chemical Cure
“Curing by chemical reaction” typically 
involves the process of cross-linking 
a polymer to achieve the desired 
properties or characteristics.
Coefficient of Expansion
The change in size of a material in 
response to temperature fluctuations is 
referred to as its “thermal expansion” or 
“coefficient of thermal expansion”.
Cohesion
The molecular force responsible 
for holding the body of a sealant or 
adhesive together and providing its 
internal strength is commonly referred 
to as “cohesion”.
Cohesive Failure 
If adhesive materials are present on 
both surfaces and they separate, it 
indicates a cohesive failure in the  
unit. In cohesive failure, the adhesive 
within the bond itself has failed,  
causing the separation.
Cold Flow
Cured Polysulfides exhibit a property 
known as “conformability”, which 
means that the rubber can adapt to 
irregular shapes. This property is 
particularly beneficial in insulating glass 
applications. In a glazing channel, if 
conformability is not present, the rubber 
may allow one lite to shift without 
compromising the seal. However, when 
stacking units, they must be stacked 
at a 90-degree angle to the support, or 
one lite may deform out of alignment. 
This is why softer sealants are preferred; 
they may deform slightly more but can 
accommodate stress and movement 
without risking glass breakage.
Condensation Resistance 
Factor (CRF)
A numerical rating assigned to windows 
and doors based on their thermal 
performance, derived from AAMA 
1502.4-197 tests on the thermally 
improved aluminum prime windows 
and sliding glass doors. This factor 
is calculated under specific testing 
conditions: an interior environment at 
68°F (20°C) and 25% relative humidity, 
and an exterior environment at 18°F 
(-8°C) with winds at 15 mph. The CRF 
indicates the degree to which a window 
or door can prevent the formation of 
condensation on its interior surface. 
A higher CRF signifies greater thermal 
resistance. Windows must achieve a 
minimum CRF of 30 to be classified  
as thermally improved.
Consistency  
The term “consistency” is used 

*(truncated, 4,989 chars total)*