CONATHANE EN-9
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Fixed En-4 Plus En-9 System
- 120-Minute Gel Window
- Multiple Elevated-Temperature Cures
Product Description
CONATHANE EN-4 / EN-9 is the curative in the fixed EN-4 Part A plus EN-9 Part B polyurethane system. EN-4 Part A is supplied separately and is always required for system use. The mixed and cured values shown apply only to this fixed pair and do not describe EN-9 Part B by itself or a prepacked kit. Documented applications include cables and connectors, modules and wound devices, and printed-circuit coatings. Mix each component before combining.
Key features
- Material system: Fixed EN-4 plus EN-9 system.
- Key characteristic: 80 and 120 minute gel points.
- Processing window: Multiple elevated-temperature cures.
Applications
- Cables and connectors
- Modules and wound devices
- Printed-circuit coatings
Technical Specifications
General Properties
Additional Information
Potting, encapsulants and underfills
CONATHANE® EN-9 Curative for the EN-4 polyurethane system
CONATHANE® EN-9 is the Part B Curative used with CONATHANE® EN-4 Part A Urethane Prepolymer to form an unfilled, two-component, 100%-solids polyurethane system. The EN-4 plus EN-9 system provides an extended viscosity-development window, reaching 100,000 cP after 80 minutes and 250,000 cP after 120 minutes at 25°C. Mixed, processing, and cured values apply to the complete EN-4 plus EN-9 system and do not describe EN-9 Part B alone.
Technical properties
EN-9 Part B as-supplied properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Amber | Not applicable | As supplied |
| Viscosity | 950 | cP | 25°C / 77°F |
| Specific gravity | 1.00 | Unitless | 25°C / 77°F |
EN-4 plus EN-9 system
Component and mixed-material properties
| Property | State / condition | Typical value | Unit |
|---|---|---|---|
| EN-4 Part A viscosity | 25°C / 77°F | 7,500 | cP |
| EN-4 Part A specific gravity | 25°C / 77°F | 0.97 | Unitless |
| Mix ratio EN-4 : EN-9 | By weight | 100:17.5 | Parts |
| Mix ratio EN-4 : EN-9 | By volume | 100:17 | Parts |
| Initial mixed viscosity | 25°C / 77°F | 6,800 | cP |
| Gel time | 100,000 cP at 25°C | 80 | min |
| Gel time | 250,000 cP at 25°C | 120 | min |
| Peak exotherm | 2 lb mass at 25°C | 55 / 130 | °C / °F |
Data scope: The EN-4 Part A value shown here is the value stated in the EN-9 system TDS. Mixed values apply only to the EN-4 plus EN-9 system.
Processing
Mix, degas, cure, and demold
Prepare and combine
Mix individual components before combining. Use 100 parts EN-4 Part A with 17.5 parts EN-9 Part B by weight, or 100:17 by volume, and mix until homogeneous.
Preheat and degas
Components may be preheated up to 60°C when reduced viscosity is required. For hand mixing, degas at greater than 27 in. Hg vacuum before use.
Application methods
Supported methods include hand-mix bench potting or casting, meter-mix bench potting or casting, and meter-mix vacuum potting or casting.
| Stage | Temperature | Time |
|---|---|---|
| Cure | 60°C / 140°F | 24 h |
| Cure | 80°C / 176°F | 16 h |
| Cure | 100°C / 212°F | 8 h |
| Demold | 60°C / 140°F | 10 h |
| Demold | 80°C / 176°F | 8 h |
| Demold | 100°C / 212°F | 4 h |
Processing boundary: Cure and demold timing begins after the unit reaches the stated temperature. The schedules are recommendations and should be evaluated for the actual application.
Cured EN-4 plus EN-9 system
Typical mechanical and environmental properties
| Property | Method | Condition | Typical value | Unit |
|---|---|---|---|---|
| Specific gravity | ASTM D792 | 25°C | 1.01 | Unitless |
| Shore hardness | ASTM D2240 | 25°C | A 90 | Shore A |
| Shore hardness | ASTM D2240 | After 7 d at 135°C | A 98 | Shore A |
| Tensile strength | ASTM D412 | 25°C | 2,000 | psi |
| 100% modulus | ASTM D412 | 25°C | 700 | psi |
| 300% modulus | ASTM D412 | 25°C | 1,300 | psi |
| Ultimate elongation | ASTM D412 | 25°C | 450 | % |
| Tear strength | ASTM D624 | 25°C | 280 | pli |
| Linear shrinkage | MIL-M-24041C | Cured | 1 | % |
| Volumetric shrinkage | MIL-M-24041C | Cured | 4 | % |
| Moisture absorption | MIL-M-24041C | 24 h at 93°C | 0.5 | % |
| Water absorption | ASTM D570 | 24 h / 30 d at 25°C | 0.2 / 0.4 | % |
| Heat-aging weight loss | MIL-M-24041C | 7 d at 135°C | 0.5 | % |
| Fungus resistance | MIL-E-5272C | Cured system | Non-nutrient | Result |
| Thermal shock | MIL-I-16923E | -70°C to 130°C | Pass, 10 cycles | Result |
| Compression set | ASTM D395 | Method B | 44 | % |
Electrical performance
Typical EN-4 plus EN-9 electrical properties
| Property | Method | Condition | Typical value | Unit |
|---|---|---|---|---|
| Dielectric strength | ASTM D149 | 1/16 in at 25°C | 750 | V/mil |
| Dielectric constant | ASTM D150 | 100 Hz / 1 kHz / 1 MHz at 25°C | 3.0 / 2.9 / 2.8 | Unitless |
| Dielectric constant | ASTM D150 | 100 Hz / 1 kHz / 1 MHz at 130°C | 3.8 / 3.8 / 3.3 | Unitless |
| Dissipation factor | ASTM D150 | 100 Hz / 1 kHz / 1 MHz at 25°C | 0.03 / 0.03 / 0.01 | Unitless |
| Dissipation factor | ASTM D150 | 100 Hz / 1 kHz / 1 MHz at 130°C | 0.03 / 0.03 / 0.04 | Unitless |
| Volume resistivity | ASTM D257 | 25°C / 130°C | >4.3 x 1015 / 7.4 x 1011 | ohm-cm |
| Surface resistivity | ASTM D257 | 25°C / 130°C | >1.0 x 1015 / 1.6 x 1012 | ohms/sq. |
| Insulation resistance | MIL-M-24041C | 25°C / 130°C | >2.5 x 1013 / 2.3 x 1010 | ohms |
| Arc resistance | MIL-M-24041C | 25°C | 120 | seconds |
| Flame resistance | MIL-M-24041C | 55 amps DC | No ignition | Result |
Hydrolytic stability
112-day exposure at 97°C / 95% RH
| Property | Original | After 112 days | Unit |
|---|---|---|---|
| Shore hardness | A 90 | A 87 | Shore A |
| Tensile strength | 2,000 | 1,700 | psi |
| 300% modulus | 775 | 700 | psi |
| Ultimate elongation | 450 | 370 | % |
| Tear strength, Die C | 280 | 190 | pli |
| Dielectric strength | 750 | 570 | V/mil |
| Dielectric constant, 1 kHz | 2.9 | 3.0 | Unitless |
| Dissipation factor, 1 kHz | 0.03 | 0.03 | Unitless |
| Volume resistivity | 4.3 x 1015 | 2.8 x 1015 | ohm-cm |
Data scope: Values are typical and are not intended for specification use.
Applications
Applications for the EN-4 plus EN-9 system
Cables and connectors
Potting and molding of military and commercial cables and connectors, watertight electrical connectors, harness breakouts, and cables.
Modules and wound devices
Potting and encapsulation of modules, wire-wound devices, and strain-sensitive components.
Printed circuitry
100%-solids and solvent-based coating applications for printed circuitry and components.
Storage and handling
Protect EN-9 and EN-4 from moisture
Store below 25°C / 77°F in a dry controlled environment away from direct sunlight. The stated shelf life is 12 months from shipment in the original sealed containers under the specified storage conditions.
The components are sensitive to moisture and atmospheric humidity. Protect opened material with dry air or nitrogen before resealing. If EN-4 Part A crystallizes during storage or shipment, heat it to 60°C, mix thoroughly, and cool to room temperature before processing.
Discuss EN-9 with EN-4 Part A
Krayden can help evaluate the EN-4 plus EN-9 system around its extended viscosity-development window, cure temperature, demold requirement, mechanical and electrical properties, assembly geometry, and service environment.
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