MF881-two components structural silicone sealant
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MF881
Two Component Silicone Structural Sealant
Insulating Glass, Structural Glazing, Facade, Curtain Wall System
APPLICATIONS
SILANDE MF881 is a two-component neutral cured silicone sealant specifically developed for the manufacturing of high performance insulating glass units used in residential and commercial use of curtain wall systems and used in structural glazing applications such as factory glazing of curtain wall units and modules for unitized and panelized systems.
- FEATURES
- Excellent adhesion to a wide range of substrates including coated, enamelled and reflective glasses, anodised and polyester paint coated aluminium and stainless steel.
- Excellent temperature stability: - 60°C to 180°C.
- High level of mechanical properties.
- High elasticity and high modulus.
- Joint movement: ±25%.
- Resistant to ozone.
♦ TYPICAL PROPERTIES
| TEST ITEMS |
MEASURED VALUE |
| Base |
Appearance |
White / Grey Ropy Paste |
| (Com A) |
Viscosity |
170,000 mPa.S |
| Catalyst |
Appearance |
Black / White Ropy Paste |
| (Com B) |
Viscosity |
80,000 mPa.S |
| As mixed |
| |
Appearance |
Black / White / Grey |
| Mixture |
Viscosity |
340,000 mPa.S |
| By weight |
Application Time (23°C, 50%) |
30-50 mins |
| (A:B = 14:1) |
Tack-free Time (23°C, 50%) |
30-60 mins |
| |
Placed Vertical (50°C) |
0 |
| Sag |
Placed Horizontal |
No deformation |
| Hardness |
Shore A - 24h |
35 |
| Shore A-14 days |
44 |
| As cured - after 14 days at T 23®C and 50% R.H. |
| |
23°C |
0.97 MPa |
| |
90°C |
0.85 MPa |
| Tensile |
-30°C |
1.84 MPa |
| Adhesion |
After Water Immersion |
1.01 MPa |
| Strength |
After Water-UV Immersion |
0.97 MPa |
| |
Adhesive Failure Area |
0% |
| |
23°C Elongation Under Max. Tensile Strength |
140% |
| Temperature Resistance |
- 60~180°C |
| Resistance to UV-Ozone |
Continuous irradiation under water-UV 2500 hrs, No change. |
| Moisture Vapour Transmission Rate (MVTR) |
17.7 [gr/m2.24hrs.2mm] - EN1279/4 |
| Gas Permeation Rate (Ar) |
755 x 10-3 [gr/m2.hrs] - EN 1279/4 |
♦ MIXING AND DISPENSING INSTRUCTIONS
SILANDE MF881 have to be mixed homogeneously and air-bubble free in the correct ratio. SILANDE MF881 should be mixed in a ratio of 14:1 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 MF881 Silicone Structural Sealant 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 hand-held 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.
Part A is stable in aig Part B is moisture-sensitive, must only be exposed briefly to aiR
♦ CURING
When mixing SILANDE MF881 A base + SILANDE MF881 B catalyst approximately in a 14:1 weight ratio, the material will become tack-free at about 50 minutes under ambient conditions of T 23°C, 50% R.H. Under these conditions approximately 70% of strength should develop within 24 hours. Development of full 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 or deeper SSG cavities.The speed of reaction mainly depends on the temperature, the higher temperature the faster curing process. Heating above 50°C is not advisable as it may lead to bubble formation.
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