RTV Polyurethane Liquid Rubber for Making Molds for Concrete
Column, GRC Products
Product Description:It consists of A&B component, B is curing agent, and A is
polyurethane prepolymer.can be used as a concrete or cement
stamping mold as well as for making hard durable rubber parts for
machinery or automotive applications.
Features:It has excellent processing properties, solid in common
temperature, shorter gel time, and regulating colour by adding
pigment. The ware has good properties of abrasive resistance,
hydrolysis resistance, transparent, good resilience, stable
dimension.
Applications
Substitute for Silicon rubber to make the mould of “cultural
stone”. It also applies to electrical equipment potting, rubber
rollers, Ski and snowboard ,rubber plates, rubber wheels, shoe
models and others.
Technical Datasheet
A | Type | MC-PU50 A |
| Appearance | Colorless or light yellow transparent liquid |
| Viscosit(y 30℃)mPa·s/ | 2500±300 |
B | Type | MC-PU50 B |
| Appearance | Light yellow liquid |
| Viscosity(30℃)/mPa·s | 560±200 |
| Ratio A:B(mass ratio) | 1:1 |
| Operation temperature/℃ | 25～40 |
| Gel time(30℃)*/min | 25-30(variable) |
| Appearance | Light yellow |
| Hardness (shore A) | 50±3 |
| Tensile strength/MPa | 5-8 |
| Elongation at break/ % | 400-500 |
| Tear strength/(kN/m) | 18-22 |
| Rebound/ % | 30-35 |
| Specific gravity(25℃)(g/ cm3) | 1.18
|
Using Instructions
NOTE: To ensure thorough coverage, lightly brush the release agent
with a soft brush over all surfaces of the model. Follow with a
light mist coating and let the release agent dry for 30 minutes.
Because no two applications are quite the same, a small test
application to determine suitability for your project is
recommended if performance of this material is in question.
Measuring & Mixing...
Liquid urethanes are moisture sensitive and will absorb atmospheric
moisture. Mixing tools and containers should be clean and made of
metal or plastic. Materials should be stored and used in a warm
environment (73°F/23°C).
IMPORTANT: Stir Part B thoroughly before dispensing. After
dispensing equal amounts of Parts A and B into mixing container,
mix thoroughly for at least 3 minutes making sure that you scrape
the sides and bottom of the mixing container several times.
If Mixing Large Quantities (16 lbs./7 kgs. or more) at one time,
use a mechanical mixer (i.e. Squirrel Mixer or equal) for 3 minutes
followed by careful hand mixing for one minute as directed above.
Then, pour entire quantity into a new, clean mixing container and
do it all over again.
Although this product is formulated to minimize air bubbles in your
the cured rubber, vacuum degassing prior to pouring rubber will
further reduce entrapped air.
Pouring, Curing & Performance..
For best results, pour your mixture in a single spot at the lowest
point of the containment field. Let the rubber seek its level up
and over the model. A uniform flow will help minimize entrapped
air. The liquid rubber should level off at least 1/2” (1.3 cm) over
the highest point of the model surface.
Curing - Allow rubber to cure a minimum of 16-24 hours at room
temperature (73°F/23°C) before demolding.
Post Curing - Optional . . . Following an overnight cure, heating the rubber
to 150°F (65°C) for 4 to 8 hours will increase physical properties
and performance.
Using The Mold - If using as a mold material, a release agent should be applied
to the mold before each casting.
Performance & Storage - Fully cured rubber is tough, durable and will perform if
properly used and stored. The physical life of the rubber depends
on how you use it.
Package:20Kg/drum or 200Kg/drum.
Storage:Store in cool and dry place. If you can’t use one drum up at a
time, please inject N2.The storage time of original packing is 6 months.
