Polysulfide Sealant for Insulating Glass

Polysulfide Sealant for Insulating Glass

CNC-998

Polysulfide Sealant for Insulating Glass 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.

Peter Lin@CNCGLASS
All rights reserved by CNC GLASS INTERLAYER TECH:
Product 1]CNC EVA INERLAYER FOR ARCHITECTURAL LAMINATED GLASS
Product 2]CNC PDLC SMART FILM FOR PRIVACY SWITCHABLE GLASS
Product 3]CNC PVB INTERLAYER FOR AUTOMOTIVE WINDSHIELD GLASS
WWW.CNCGLASS.COM

Safety Caution of EVA-80 EVA Film Processed at 80 ºC DONOT Cross-Link at all

Safety Caution of EVA-80 EVA Film Processed at 80 ºC DONOT Cross-Link at all

Safety Caution of EVA-80: EVA Film Processed at 80 ºC DONOT Cross-Link at all

By Peter Lin

There is EVA film for laminated glass that it can be processed at 80 degree ºC .
After we made many tests, we proofed that the EVA film processed at 80ºC don’t cross-link at all.
If the EVA film don’t cross-link at all after heating , how can we trust the laminated glass’s safety properties?

We ran TGA (Thermogravimetric analysis) experiments and see what are the results.
First, we cured a 10x10cm sample of EVA-80 between two glass sheets. The heating profiles were at 80°C-120 minutes.

How do we get the results of gel content test? We weighted a 4x4cm cured EVA and placed in toluene overnight (16 hours). Then the sample was fully dry (one hour in a fume cupboard and one hour in vacuum oven at 100°C) and weighted again. With the weight loss was calculated the amount of gel content.

The first samples we ran (80°C-120minutes) were fully dissolved in the toluene solution overnight. We saw that behaviour before with an EVA thermoplastic, with no cross-linking. So, for our experiments and previous experiences, EVA-80 did not cross-link at all at 80°C during 1.5 and 2 hours.

All our experiments did not show any cross-linking level. After several analyses with different techniques (immersion in toluene and DSC) we got the conclusion that EVA-80 does not cross-link at all. It is just behaving as a thermoplastic. So it is not thermally and chemically stable, both properties are important to safety laminated glass to pass the European certificates for a architectural commercial product.
Hope this is more clear explanation. If you require more information, please feel free to contact us.

All rights reserved by CNC GLASS INTERLAYER TECH:
Product 1]CNC-Force EVA INERLAYER FOR ARCHITECTURAL LAMINATED GLASS
eva@evafilms.com
Product 2]CNC-SmartSMART FILM FOR PRIVACY SWITCHABLE GLASS
smartfilm@smartestglass.com
Product 3]CNC-Shield PVB INTERLAYER FOR AUTOMOTIVE WINDSHIELD GLASS
Web: www.CNCglass.com www.CNCnext.com
Mail: cnc@cncglass.com
benext77@gmail.com

Peter Lin@CNCGLASS CNCGLASSCOM

 

De-lamination Solution of Processing Laminated Glass With EVA Film

De-lamination Solution of Processing Laminated Glass With EVA Film

De-lamination Solution of Processing Laminated Glass With EVA Film
By Peter Lin

General View:
I have talked about the Bubbles Solution for Laminated Class with EVA Film , and today I would like to talk about the other problems you may face in laminating glass with EVA FILM.
The common problems are: de-lamination and self-exposing of the laminated glass.

De-lamination:

1)- The heating temperature is not high enough or the heating time is not long enough for the EVA FILM to melt and react totally, so the cross link reaction is not finished.
For this reason, please increase the heating temperature or prolong heating time of laminating.

2) -The EVA FILM is out of the shelf life, most EVA FILM’s self life is about one year or longer. Please use the EVA FILM within the self life. Yes, different EVA FILM manufacturers may have different self life for the EVA Film.

4)-Maybe it’s the problem of the quality of the EVA FILM. Send some film samples back to the EVA FILM manufacturer to test the EVA FILM again.

5)-The moisture of the glass or EVA FILM is too much. EVA FILM are less sensitive to moisture, but if it’s too high, it will do harm to the adhesion of EVA FILM. Please dry glasses and storage EVA FILM in good way.

6)-There is some organic substance on the surface of glasses. For example oily substance will also do harm to the adhesion of EVA FILM.
Please clean the glasses if necessary. You can use clean water, industrial alcohol, Acetone to clean the glasses.

7)-When laminated with the painting papers (like PP, PVC), the printing ink is too much and not being dried.
Please dry the printing papers first before laminating with glasses and EVA FILM.

8)-If you found the de-lamination is happening in the edges of the laminated glass, here is why:
Maybe the workers’ hand touch the edges of the glasses, and there are oily substance in the hand, which will do harm to the adhesion of the EVA FILM.
Please ask your worker to wear gloves.
Maybe its summer, and your workers work very hard, and their hands are sweaty. And the sweat will do harm to the EVA FILM.

Any other situation, please feel free to contact us.
ALL RIGHT RESERVED BY CNC INTERLAYER TECH :
All rights reserved by CNC GLASS INTERLAYER TECH:
Product 1]CNC-Force EVA INERLAYER FOR ARCHITECTURAL LAMINATED GLASS
eva@evafilms.com
Product 2]CNC-SmartSMART FILM FOR PRIVACY SWITCHABLE GLASS
smartfilm@smartestglass.com
Product 3]CNC-Shield PVB INTERLAYER FOR AUTOMOTIVE WINDSHIELD GLASS
Web: www.CNCglass.com www.CNCnext.com
Mail: cnc@cncglass.com
benext77@gmail.com

Peter Lin@CNCGLASS_co

CNCGLASSCOMDe-lamination Solution of Processing Laminated Glass With EVA Film