Description
This urethane rubber does not inhibit the cure of most platinum or tin cure silicone rubbers.
Compat™ 45 features low viscosity for easy mixing and pouring, curing with minimal bubble entrapment.
The mix ratio is 1A:1B by volume (85A:100B by weight), with a pot life of 25 minutes, and it cures to an ultimate Shore hardness of 45A.
The cured rubber is dimensionally stable with low shrinkage, offers good wear resistance, and excellent library life.
Compat™ 45 is used to make molds for casting silicone prop body parts, animatronic skins, and medical trainers, as well as rubber masters that can be molded with platinum or tin silicone without inhibition concerns.
Important:
Do not use
with this product:
Ecoflex™ Gel, Ecoflex™ 00-10, Ecoflex™ Near Clear,
Encapso-K, Rubber Glass™, Solaris™,
Soma Foama™,
Sorta-Clear™ 12 or 37
as they are not compatible and inhibition will result.
Technical Properties
- Mix Ratio By Volume: 1A:1B
- Mix Ratio By Weight: 85A:100B
- Working time: 25 minutes
- Cure Time: 16 hours
- Shore Hardness: 45A
- Specific Gravity: 1.12 g/cc
- Specific Volume: 0.89 cm³/g
- Color: Brown
- Tensile Strength: 4.34 MPa
- 100% Modulus: 945 kPa
- Elongation @ Break: 772%
- Die C Tear Strength: 17.7 kN/m
- Mixed Viscosity: 2,600 mPa·s
Instructions
Preparation
Store and use at room temperature (23°C).
These products have a limited shelf life and should be used as soon as possible.
Use in a low-humidity environment (below 50% relative humidity).
Mixing containers should have straight sides and a flat bottom. Mixing sticks should be flat and stiff with defined edges for scraping the sides and bottom of your mixing container.
Good ventilation (room size) is essential. Wear safety glasses, long sleeves, and rubber gloves to minimize contamination risk.
Models with porous surfaces (gypsum plasters, concrete, wood, stone, etc.) must be sealed prior to applying a release agent. Sonite™ Wax is a proven sealer for porous surfaces.
Important:
Ecoflex™ Gel does not cure against this product. It is not recommended to make a gel-filled makeup prosthetic appliance with this product, as cap plastic material will adhere to it.
Non-Porous Surfaces such as metal, glass, hard plastics, sulfur-free clays, etc., require only a release agent.
Applying a Release Agent
Use a release agent made specifically for mold making. If casting platinum silicone into this product, only use Ease Release™ 200 when making your mold,
DO NOT use Universal™ Mold Release.
A liberal coat of release agent should be applied onto all surfaces that will contact the rubber.
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 (23°C).
Important: Pre Mix the Part B before using. After dispensing equal amounts of Parts A and B by volume into the mixing container, mix thoroughly for at least 3 minutes making sure that you scrape the sides and bottom of the mixing container several times. After mixing parts A and B, vacuum degassing is recommended to eliminate any entrapped air in liquid rubber. Your vacuum pump must pull a minimum of 29 inches of mercury (or 1 Bar / 100 KPa). Leave enough room in the container for material expansion. Vacuum material until it rises, breaks, and falls. Vacuum for 1 minute after material falls.
If Mixing Large Quantities (7 kg/16 lbs. 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 the entire quantity into a new, clean mixing container and do it all over again.
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 1.3 cm (1/2”) over the highest point of the model surface.
Allow rubber to cure a minimum of 24 hours at room temperature (23°C) before using. Cure time can be reduced with mild heat. Do not cure rubber where temperature is less than 18°C.
To thicken for brush on applications, only use URE-FIL™ 11 filler. Recommended starting proportion: Mix 1 part URE-FIL™ 11 with 1A:1B of this product. Add more in small amounts if necessary. DO NOT USE URE-FIL™ 9 (CAB-O-SIL) WITH THIS PRODUCT.
Important: Do not add Kick-iT!™ cure accelerator, this will cause cured urethane to inhibit silicone.
Post Curing (Optional): Following a 24-hour cure, heating the rubber to 65°C (150°F) 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. The type of release agent to use depends on the material being cast. The proper release agent for wax, liquid rubber, or thermosetting materials (i.e., Smooth-On liquid plastics) is a spray release made specifically for mold making. Prior to casting gypsum plaster materials, sponge the mold with a soap solution for better plaster flow and easy release. Aquacon™ Water Based Release Agent is recommended for releasing abrasive materials like concrete.
Performance & Storage
Fully cured rubber is tough, durable, and will perform if properly used and stored. Molds should be stored on a level surface at room temperature in a dry environment. Do not stack molds, expose them to moisture or UV light for prolonged periods.
Important: Shelf life of product is reduced after opening. Remaining product should be used as soon as possible. Immediately replacing the lids on both containers after dispensing product will help prolong the shelf life of the unused product. XTEND-IT™ Dry Gas Blanket will significantly prolong the shelf life of unused liquid urethane products.
