MF882 -Two components Silicone sealant for insualting glass
Secondary Sealant for the Manufacturing of Insulating Glass
SILANDE MF882 is a two- |
• Excellent adhesion to a wide range of |
component neutral cured |
substrates including coated, enamelled |
silicone sealant |
specifically |
and reflective glasses, anodised |
and |
developed for the manufacturing |
polyester paint coated aluminium |
and |
of insulating glass units used for |
stainless steel. |
|
window and door, |
vehicles and |
• Excellent temperature stability: - 60°C to |
refrigeration, also |
can be used |
180°C. |
|
for edge frame |
curtain wall |
• High level of mechanical properties. |
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system. |
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• High elasticity and high modulus. |
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• Resistant to ozone. |
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TYPICAL PROPERTIES |
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TEST ITEMS |
MEASURED VALUE |
|
Base |
Appearance |
White / Grey Ropy Paste |
|
(Com A) |
Viscosity |
150,000 mPa.S |
|
Catalyst |
Appearance |
Black / White Ropy Paste |
|
(Com B) |
Viscosity |
80,000 mPa.S |
|
Mixture |
Appearance |
Black / White / Grey |
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By weight |
Application Time (23°C, 50%) |
30-50 mins |
|
(A:B = 16:1) |
Tack-free Time (23°C, 50%) |
30-60 mins |
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Placed Vertically (50°C) |
0 |
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Placed Horizontal |
No deformation |
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Shore A - 4h |
22 |
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Hardness |
Shore A - 24h |
40 |
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Shore A-14 days |
46 |
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After 14 days at a temperature of 23°C and RH 50%. |
Elastic Recovery |
94% |
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Adhesion Property at Definite Elongation |
No Damage |
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|
23°C |
0.92 MPa |
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After Aging in Hot Air |
1.10 MPa |
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Tensile |
300 hr After Water-UV |
0.82 MPa |
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Adhesion |
-20°C |
1.28 MPa |
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Strength |
60°C |
0.85 MPa |
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After Water-UV Immersion |
0.79 MPa |
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Adhesive Failure Area |
0% |
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Elongation under maximum tensile strength at 23°C 93% |
|
TGA |
3.6% |
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Moisture Vapour Transmission Rate (MVTR) |
12.3 [gr/m2.24hrs.2mm] - EN1279/4 |
Gas Permeation Rate (Ar) |
360 x 10-3 rgr/m2.hrsl - EN1279/4 |
MIXING AND DISPENSING INSTRUCTIONS
SILANDE MF882 has to be mixed homogeneously and air-bubble free in the correct ratio.SILANDE MF882 should be mixed in a ratio of 16:1 base to curing agent by weight, or equivalent 10:1 by volume for optimal properties. At this mix ratio, the sealant typically exhibits a working time of 30~50 minutes and allows units to be handled within 3 hours. Slight variations in mixing ratio can be tolerated, but these should not exceed 9:1 to 16:1 by weight to ensure maximum properties are obtained. To obtain the ultimate physical properties from SILANDE MF882, it is recommended that the base and curing agent are thoroughly mixed using an airless mixing system found on most existing commercially available two-part silicone dispensing machines. Neither hand mixing nor the use of handheld power mixers are satisfactory due to their incorporation of air into the material during mixing that would result in altered physical properties of the cured sealant.Most commercially available metering and mixing equipments are suitable.
CURING
When mixing MF882 A base + MF882 B catalyst at approximately a 16:1 weight ratio, the material will become tack-free at about 50 minutes under ambient conditions of 23°C, 50% R.H. Under these conditions approximately 70% of strength should develop within 24 hours. Development of fu11 properties requires full evaporation of cure by-products and will normally be achieved within 7 days. Full properties will take additional time in colder climates.