Polysulfide Sealant for Insulating Glass
CNC-998
Polysulfide Sealant for Insulating Glass 
Polysulfide Sealant for Insulating Glass
CNC-998
Description
It is a kind of two-part room temperature vulcanized polysulfide sealant with high performance especially formulated for insulating glass.
This sealant has excellent elasticity, heat gas penetration and adherent stability to various glasses.
Insulating glass is a kind of energy-efficient material with various functions of soundproof, heat-resistant, anti-frost, and anti-fume, etc. It is widely used as the wind shields in construction, trains automobiles and the door glasses in refrigerators and freezing cabins.
The property of CNC-998 is certificated by JC/T 486 -2001standard <Elastic Sealant for Insulating Glass>.
CNC-998 is certificated by GB/T11944-2002 standard -<Insulating Glass>.
Where to use
CNC-998 Polysulfide sealant is specially designed for insulating glass.
Application
1-Two parts of CNCGLASS CNC-998 packaged respectively of composition A (basic gel) and composition B (curing agent), are mixed together according to the ratio of A: B=10: 1 before application. The curing rate may be modulated by changing the weight ratio of composition A to composition B over the range of 12:1 to 8:1 according to different environment conditions.
2-The mixture of sealant can be classified into two methods, one by hand-made and the other by special extrusion machine. It is noticed that CNCGLASS CNC-998 sealant should be scratched and mixed by the spatula along the same direction repeatedly to prevent gas bubble trapped in sealant in the method of hand-made. The homogeneity of mixture can be measured by butterfly-type method as listed in the following figure:
3-The surfaces of insulating glasses must be dry and clean.
4- CNCGLASS CNC-998 should fill the joints completely which need to be caulked during the course of making insulating glass.
5-Gun mouth should be assured to move along the same direction at uniform velocity to make the joints full of sealant and prevent the gas bubble production due to moving too fast or back and forth in the method of using special extrusion machine.
6-The sealant overflowing the joints should be pressed back at once by spatula to make the sealant contacting with the sides of the joints completely and smooth the surface of the joints along the same direction.
Main Technical Properties (Only for Reference)
Under the conditions of the 23±2℃ and the R.H. 50±5%
Item Component A Component B
Viscosity(Pa’s) 4000 800
Appearance Fine, smooth and homogeneous fine, smooth and grease-like
Color White Black
Density(g/em3) 1.75±0.1 1.52±0.1
Mixed Component A and Component B at 10:1 by weight, under the conditions of 23±2℃and the R.H. of 50±5%
Item Standard Result Test method
Resistance to flow, mm Vertical ≤3 0.8 GB/T113477
Level No distortion No distortion
Application Time, 30min ,S ≤10 4.8
A:B=10:1, Under the conditions of the 23±2℃and the R.H. of 50±5%, after 7days of curing:
Item Standard Result Test method
Durometer hardness (Shore A) 45 GB/T1531
Tensile strength , MPa MPa 0.8 GB/T113477
Permeation rate of evaporation (g/m2.d) ≤15 8 GB/T11037
GB/T113477 25HM JC/T1486
Packing
CNC-998 Polysulfide sealant is available as:
Packing 1: Component A: 300kg/ steel drum Component B: 30kg/ steel drum
Packing 2: Component A: 30kg/ steel drum Component B: 3kg/plastic pail
Shelf Life Storage
When stored at or below 27℃ in the original unopened containers, this product has a shelf life of 12 months from the date of production.
Precautions
Avoid direct contact with food and cosmetic.
Avoid prolonged skin contact with uncured sealant.
The uncured sealant should not contact with eyes and mouth. If sealant gets into eyes, flush with water. See physician if necessary.
Ensure good ventilation if used indoor.
Keep out of reach of Children.
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