Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Plastics & Elastomers Functions
- Technologies
- Product Families
Features & Benefits
- Materials Features
- Prodcut Highlights
The ColorMatch™ Series also readily accept fillers (such as URE-FIL™ 3 from Smooth-On). Because of its neutral color, Smooth-Cast™ 325 is ideal for creating marble and wood grain casting effects, or duplicating the look of real metal by adding bronze, brass or other metal powder. Applications for the ColorMatch™ Series plastics include making pigmented prototype models or figures, special effect props, reproducing small to medium size sculptures, decorative jewelry, etc.
Applications & Uses
- Markets
- Applications
- Plastics & Elastomers End Uses
- Plastics & Elastomers Processing Methods
- Processing Recommendations
Preparation
These products have a limited shelf life and should be used as soon as possible. Materials should be stored and used in a warm environment (73°F/23°C). All liquid urethanes will react with moisture in the air, causing bubbles. Use in a low humidity environment (below 50% RH). 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. 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.
Applying A Release Agent
A release agent is necessary to facilitate demolding when casting into or over most surfaces. Use a release agent made specifically for mold making (Universal™ Mold Release or Mann’s Ease Release™ 200 available from Smooth-On or your Smooth-On distributor). A liberal coat of release agent should be applied onto all surfaces that will contact the plastic.
IMPORTANT
To ensure thorough coverage, apply release and brush with a soft brush over all surfaces. Follow with a light mist coating and let the release agent dry for 30 minutes. Smooth-On silicone rubber molds usually do not require a release agent unless casting silicone into the mold. Applying a release agent will prolong the life of the mold.
Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Pot Life at 73°F (23°C) | 2.5 | Minute | ASTM D-2471 |
| Cure Time at 73°F (23°C) | 10 | Hr | — |
| Tensile Strength | 3170 | psi | ASTM D-638 |
| Tensile Modulus | 140000 | psi | ASTM D-638 |
| Elongation at Break | 10 | % | ASTM D-638 |
| Flexural Strength | 3690 | psi | ASTM D-790 |
| Flexural Modulus | 101000 | psi | ASTM D-790 |
| Compressive Strength | 3500 | psi | ASTM D-695 |
| Compressive Modulus | 36500 | psi | ASTM D-695 |
| Shrinkage | 0.01 | in./in. | ASTM D-2566 |
| Mix Ratio | 1A:1B (115A:100B) | by volume (by weight) | — |
| Mixed Viscosity | 100 | cps | ASTM D-2393 |
| Specific Gravity | 1.07 | g/cc | ASTM D-1475 |
| Specific Volume | 25.9 | cu. in./lb | ASTM D-1475 |
| Hardness | 72 | Shore D | ASTM D-2240 |
| Heat Deflection Temp | 120 (50) | °F (°C) | ASTM D-638 |
Technical Details & Test Data
- Pigmenting Measuring and Mixing
Pigmenting
Pre-Mix Pigment Or Fillers With Part B - For consistent results, pigment or fillers should be added by weight each time. Some “test” castings may have to be made until desired affect is achieved. Add desired amount of pigment or filler to ColorMatch™ Part B and blend thoroughly to a uniform consistency before adding Part A.
NOTE: When adding SO-Strong™ RED tint to Smooth-Cast™ 326 or 327, the color will darken and change. For a better match when using SO-Strong™ RED, use SmoothCast™ 325 as your casting resin. This is only an issue with SO-Strong RED, all other SO-Strong™ colors will behave normally.
How Much Pigment or Filler? Pigment Example: Generally, 0.5% - 1% Smooth-On pigment added by weight of Part B will yield rich, vibrant color. For translucent effect, add 0.1% pigment. Metal Cold Casting: Ask for our Technical Bulletin On Metal Cold Casting. Because end-user requirements vary for desired finished effect, we can not offer all pigment or filler loading percentage possibilities. Again, “test” castings may have to be made until desired effect is achieved.
Measuring & Mixing
Liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Mixing tools and containers should be clean and made of metal, glass or plastic. Materials should be stored and used in a warm environment (73°F/23°C). Stir or shake both Part A & Part B thoroughly before dispensing. After dispensing equal volumes of Parts A and B into mixing container (115A:100B by weight) and mix thoroughly. Stir deliberately making sure that you scrape the sides and bottom of the mixing container several times. Be careful not to splash low viscosity material out of the container.
- Pouring Curing and Performance
Pouring
For best results, pour your mixture in a single spot at the lowest point of the containment field and let the mixture seek its level. This will help minimize air entrapment.
Curing-Important
Use this product with at least room size ventilation or in proximity to a forced outlet air vent and do not inhale/breathe fumes. Fumes, which may be visible with a significant mass concentration, will quickly dissipate with adequate ventilation. Castings with significant mass may be hot to the touch and irritate skin immediately following cure. Let casting cool to room temperature before handling. Demold time of the finished casting depends on mass and mold configuration. Low mass or thin-walled castings will take longer to cure than castings with higher mass concentration. Smooth-Cast™ 325 will cure in 7-10 minutes, Smooth-Cast™ 326 in 60 minutes and Smooth-Cast™ 327 in 2-4 hours depending on mass and mold configuration. Castings made with Smooth-Cast™ ColorMatch™ liquid plastics will remain semi-rigid longer that other Smooth-Cast™ resins depending on mass.
Post Curing
Castings will reach “full cure” faster and achieve maximum physical properties if post cured. Allow material to cure for recommended cure time at room temperature followed by 4 - 6 hours at 150°F / 65°C. Allow casting to come to room temperature before handling.
Performance
Cured castings are rigid and durable. They resist moisture, moderate heat, solvents, dilute acids and can be machined, primed/painted or bonded to other surfaces (any release agent must be removed). If machining cured material, wear dust mask or other apparatus to prevent inhalation of residual particles. Castings can be displayed outdoors after priming and painting. Unpainted castings will yellow over time - more quickly when exposed to ultra-violet light.
Safety & Health
- Safety
Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Use only in a well-ventilated area
Storage & Handling
- Shelf Life
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 (available from Smooth-On) will significantly prolong the shelf life of unused liquid urethane products.