CONATHANE TU-701
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Fixed Tu-401/TU-701 Polyurethane System
- 20 to 30-Minute Working Window
- Shore A 70 with 750% Elongation
Product Description
CONATHANE TU-401 / TU-701 is the Part B curative for the fixed CONATHANE TU-401 Part A plus TU-701 Part B polyurethane system. The unfilled, 100% solids formulation supports casting and potting processes for flexible molds, industrial wheels, pads, gaskets, bushings and damping components, with room-temperature and elevated-temperature cure options. Documented applications include flexible molds and tooling, industrial wheels, pads and bushings, and gaskets and damping pads. The TU-401 / TU-701 system can be processed by hand mixing, meter mixing or vacuum potting and casting.
Key features
- Mix ratio: Fixed TU-401 Part A / TU-701 Part B polyurethane system with a 100:65 mix ratio by weight.
- Processing window: 20-30 minute work life at 25 C with room-temperature or 80 C cure options.
- Mechanical performance: Cured system provides Shore A 70 hardness, 750% elongation and 8,000-hour ASTM G53 UV exposure without visual degradation.
Applications
- Flexible molds and tooling
- Industrial wheels, pads and bushings
- Gaskets and damping pads
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Electrical Properties
Additional Information
Tooling & Moldmaking Materials
TU-701 Part B curative for the fixed TU-401 / TU-701 tooling elastomer system
CONATHANE TU-701 is the Part B curative for the fixed CONATHANE TU-401 Part A plus TU-701 Part B polyurethane system. The unfilled, 100% solids formulation supports casting and potting processes for flexible molds, industrial wheels, pads, gaskets, bushings and damping components, with room-temperature and elevated-temperature cure options.
As-Supplied Properties
Component and mixed-material properties
Keep component properties distinct from mixed-system values. The values below are typical and apply at the stated conditions.
| Property | TU-701 Part B Curative | TU-401 Part A Prepolymer | Condition / Basis |
|---|---|---|---|
| Viscosity | 400 cP | 8,500 cP | 25 deg C |
| Specific gravity | 1.01 | 1.04 | 25 deg C |
| Appearance | Clear amber | Clear light amber | As supplied |
| Mix ratio | 65 parts by weight; 67 parts by volume | 100 parts by weight; 100 parts by volume | Fixed TU-401 / TU-701 system |
| Initial mixed viscosity | 2,000 cP | - | 25 deg C |
| Work life | 20-30 minutes | - | 25 deg C |
Typical values are not intended for specification use.
Processing
Mixing, de-airing and cure
The TU-401 / TU-701 system can be processed by hand mixing, meter mixing or vacuum potting and casting. The cure schedules are recommendations and should be optimized for the application.
- Mix TU-401 Part A and TU-701 Part B at 100:65 by weight or 100:67 by volume until homogeneous.
- Components may be preheated up to 60 deg C when reduced viscosity is required.
- For hand mixing, degas the mixed material at greater than 27 in. Hg vacuum before use.
- Cure for 7-21 days at 25 deg C or 16 hours at 80 deg C.
Demold and cure windows
- Demold: 24 hours at 25 deg C or 2 hours at 80 deg C.
- Cure time is based on time after the unit reaches the specified temperature.
- Use only the fixed TU-401 Part A and TU-701 Part B pairing for the mixed and cured values shown on this page.
Storage and Handling
Protect the components from moisture during storage and use
Both components should be stored in a dry, controlled environment below 25 deg C and out of direct sunlight.
- Original sealed containers: 12 months from date of shipment when stored as recommended.
- The material is sensitive to moisture and atmospheric humidity.
- Once opened, use immediately or blanket with dry air or nitrogen before resealing.
- Mix individual components thoroughly before use.
Technical Guidance
System boundary and process control
This page is component-focused on TU-701 Part B, while mixed and cured properties are presented only for the fixed TU-401 Part A plus TU-701 Part B system.
Part B is not a standalone cured system
Use TU-701 Part B only with the fixed TU-401 Part A counterpart when applying the mix ratio, work-life, cure and final-property data shown here.
Cure schedule selection
The room-temperature and 80 deg C cure schedules are recommendations. Determine the optimum cure conditions for the specific casting geometry and process.
Final-State Properties
Typical cured TU-401 / TU-701 system properties
These mechanical and electrical values apply to the mixed and cured fixed system under the source conditions.
| Property | Typical Value | Method / Condition |
|---|---|---|
| Shore hardness | A 70 | ASTM D2240, 25 deg C |
| Tensile strength | 3,000 psi | ASTM D412, 25 deg C |
| 100% / 200% / 300% modulus | 300 / 500 / 650 psi | ASTM D412, 25 deg C |
| Ultimate elongation | 750% | ASTM D412, 25 deg C |
| Graves tear strength | 280 pli | ASTM D412, 25 deg C |
| Linear shrinkage | <0.5% at 25 deg C cure; 1.0% at 80 deg C cure | ASTM D2566 |
| UV resistance | 8,000 hours without visual degradation | ASTM G53 Weatherometer |
| Dielectric strength | 500 V/mil | ASTM D149, 1/16 in. at 25 deg C |
| Volume resistivity | 3.4 x 1011ohm-cm | ASTM D257, 25 deg C |
| Surface resistivity | 9.4 x 1012ohms/sq. | ASTM D257, 25 deg C |
All listed values are typical and are not specification limits.
Applications
Casting and tooling applications
The fixed TU-401 / TU-701 polyurethane system is recommended for potting and casting uses requiring elastomeric behavior and UV stability.
Flexible molds and tooling
Use for flexible mold and casting applications where an elastomeric polyurethane system is required.
Industrial wheels, pads and bushings
Typical uses include industrial wheels, metal-forming pads and bushings.
Gaskets and damping pads
Typical uses include washers, gaskets and vibration, shock or sound damping pads.
Discuss TU-401 / TU-701 processing for your casting geometry
Krayden can help review the fixed TU-401 Part A and TU-701 Part B mix ratio, viscosity, de-airing approach, cure schedule and cured-property requirements for your tooling or casting application. Krayden can also help review the documented processing conditions and evaluation criteria before testing.
