MF889A-25 silicone stone weatherproof sealant is a low modulus, single-component elastic sealant. It solidifies after contacting moisture in the atmosphere to form an elastic sealant. The product does not contain toxic and harmful substances, does not pollute the environment, can form a good bond with most building materials, and provides excellent weatherproof sealing performance. It has low modulus, 100/50 grade high displacement capacity, and strong ability to withstand high and low temperature alternating repeated deformation. It can be widely used in the sealing of various building exterior walls in the residential industrialization, waterproof sealing of porous materials such as stone curtain walls.\

Sealant for building doors and windows
Slander
Features and Benefits
◎Environmentally friendly: low VOC, non-toxic, no pollution to the base material, no corrosion;
◇Good operability: single component, easy to operate, just extrude it with a glue gun and
apply it directly;
◎Good adhesion: good adhesion to most building materials such as
glass, aluminum, stone, concrete, GRC siding, etc.;
◇Excellent displacement capability: low modulus, high displacement capability of 100/50
levels;
◇Excellent aging resistance: strong UV resistance and weather resistance, long material
life cycle and good long-term protective performance.
composition
◎Single-component, neutral, water-vapor curing silicone sealant.
application
◇Installation of various doors and windows in prefabricated concrete buildings and caulking and sealing
of interior and exterior walls; ◎Waterproof sealing of porous materials such as stone
curtain walls; ◎◇Other bonding and sealing suitable for this product in the construction field.
Main Specifications
Test items
skills requirement
When the wood is cured, test it under the conditions of temperature (23±2)℃ and relative humidity (50±5)%
Droop, mr
Extrudability,ml/min
Surface drying time, h
Bonding time, d
Construction temperature range,℃

Cured and tested for 28 days under the conditions of temperature (23±2)℃ and relative humidity (50±5)%
Test results
Guideline

GB/T 13477.6

GB/T 13477.3

GB/T 13477.5

Hardness, Shore A

GB/T 531.1
Temperature resistance range after curing,℃

Modulus at 100% elongation, MPa

Elongation at break,%

Tensile strength, MPa

Displacement capacity,%

GB/T 22083
pollution depth

Pollution, mm
GB/T 23261
contamination width

color
In addition to black, gray and white, we can also negotiate and produce special colors according to customer requirements.

GB/T 22083 G, F 100/50
Adopt standards
Application method
MF889A-25 silicone stone weather-resistant sealant meets or even exceeds the following standards and specifications:

◇Surface cleaning
Remove all grease, dust, and water remaining at seams and recessed parts of the assembly

stains, frost, surface stains, old sealant, assembly accessories and protective coatings and other
impurities and contaminants.
Non-porous materials (such as metal and glass) must use solvent to clean the surface
to be glued according to the "two-cloth wiping method". In all cases, solvent must
be wiped with a clean, lint-free white cloth. Do not use detergent or soapy water.
Porous materials must be cleaned by grinding, sawing, washing (with water, etc.), mechanical grinding,
or a combination of the above methods to clean the surface to be sealed. Be sure to ensure that the
surface to be applied with sealant is completely clean and dry. Materials such as dust and loose particles
should be blown away with grease-free compressed air or vacuumed up.
◎Use primer
An adhesion test must be passed to determine whether a primer is required. If it is determined through
testing that primer is needed, pour the primer onto a piece of lint-free white cloth before injecting
glue, apply it to a thin layer on the surface of the joint to be glued, and let it air dry in time.
◎Shading
Areas near seams need to be masked to ensure perfect and neat work lines. Never allow masking tape to come into
contact with the clean surface to which glue will be applied. After the glue injection is completed, trimming
must be carried out immediately before the sealant has formed a skin. After the trimming work is completed,
the masking tape should be removed immediately.
◎Packing material
Open-cell polyurethane foam rods, closed-cell polyethylene, and non-outgassing polyolefin
materials are recommended cushioning materials. For shallower joints, polyethylene tape is
recommended to prevent three-sided bonding.
●Glue injection method
●Install appropriate gasketing material, adhesive spacers or tape as required.
●Continuously squeeze MF889A-25 silicone stone weather-resistant sealant into and fill the joints.
When the surface of the sealant has not yet formed a skin, use appropriate force to compact the
sealant into the lining material and joint surface. It is recommended to use convex tools to
trim the rubber surface into a concave shape. Do not use soap or water as auxiliary materials
for trimming.
After trimming, remove the masking tape immediately.
● Be careful not to splash uncured silicone sealant onto non-abrasive surfaces, such as polished
granite or other natural stone, because these wet silicone sealants cannot be completely
removed with organic or chlorinated solvents. Therefore, these surfaces must
be masked, or extra care must be taken when applying glue to prevent the sealant from
coming into contact with these surfaces. Once the uncured sealant comes into contact
with these surfaces, it will leave a film on the surface, possibly Affects the aesthetics
of the substrate surface.
Operation precautions
● If it accidentally enters the eyes, rinse immediately with water
●Do not come into contact with skin for a long time and avoid contact with children.
●Do not contaminate food, drugs or cosmetics
Please do an adhesion test before use and refer to our company's technical information and safety data.
According to the table, learn about the safe use, hazards and other information of the product.
For all safety matters not involved in the product, please comply with the requirements of JGJ102.
Storage and validity period
Well-packaged products can be stored in a cool, ventilated and dry place for 12 months and should be used before
the "expiry date" on the outer packaging of the product.
Package
Soft packaging: 592ML each, 20 pieces per box
Usage restrictions
This product is not approved for use as a structural adhesive, nor has it been tested or represented as suitable
For medical or medicinal purposes.
This product is not suitable for:
●Interfaces in groundwater or places subject to excessive friction
long term immersion in water
On the surface of building materials that may exude oil, plasticizers, solvents, or are partially vulcanized
Rubber gasket or tape
Frosted or damp surfaces 2
●
Places that are completely out of contact with air during curing (sealant needs water vapor to solidify)
change)
Application of paint on the sealant surface (general paint cannot adhere to the silicone
surface)
●Direct contact with food or other food grade surface applications
●When bonding cement and concrete substrates, the substrate must be completely dry and cured for 7 days
before construction, otherwise the bonding performance will be affected.
Technical Services
● Provide complete product technical information.
Adhesion test, compatibility test.
● Our company's laboratory can provide contamination testing for customers. Customers can mail
(or in other forms) the base materials selected in the project to us, and our company's
laboratory will conduct contamination testing and issue a written test report.