For exterior(Weatherproof weather seal)


MR-887 is 1 liquid alkoxy hardening type silicon sealant and an exclusive flexible joint designed for proper joint sealing on every kind of exterior material and multipurpose high performance product showing outstanding weatherproof and durability and superior adhesion without primer on most of the materials.


Distinct Features of the Product

· High strength and high elongation sealant for exclusive flexible joint
· Excellent weatherproof and durability
· Strong adhesion and permanent elastic restoring force maintenance
· 1 liquid type easy to construct
· Usable on most of materials without primer
· Satisfying relative regulations- KS F4910 F-25HM grade

※ It is prohibited to use at the area expected the joint movement of polycarbonate is more than ±30% and the joint will be moved within 1 hour.

Usage of the Product

· Sealing material exclusive for flexible joint
· Every kinds of exterior material masonry joint sealing
· Joint sealing for concrete, PC, RC and so on
· Lexan (Partial application is possible), stone (Low pollution) joint sealing
· Curtain wall joint sealing
· Windows and doors sealing and window frame joint sealing
· Curtain wall AL frame assembly (AL frame assemble)

Property of the Product

Classification Contents
Working possible time Within 10 minutes
Surface hardening time Within 20 minutes (23℃ 50% RH)
Complete hardening time 7 ~ 14 days
Work possible temperature (Before hardening) 4 (Air temperature) ~ 50℃ (Substrate temperature)
Adaptation temperature
(After hardening)
-50℃ ~ 150℃
Hardness (Shore A) 25 ~ 35
Classification Contents
Tensile strength 1.2 ~ 1.7 N/㎟ (ASTM D 412)
Elongation 400 ~ 600% (ASTM D 412)
Specific gravity 1.38 ± 0.1
Hardening type Oxime hardening type
Ozone resistance/UV rays resistance Superior
Packing unit 270 ml (CTG)
Relative regulation KS F 4910 F-25LM, G-25LM