1401-21T / 4101-21
Thixotropic Epoxy System for Hand Layup –
Multifunctional epoxy and cycloaliphatic-amine blend hardener for high performance composite parts. Thixotropic 1401-21“T” resin helps to prevent drainage in laminate on vertical surfaces. Two curing agents (4101-21 fast and 4101-21 slow) provide a complete range of working times from 40 minutes to 6 hours, and by blending the curing agents, any point in between.
Description
Suggested Uses
System Liquid Properties
| System Liquid Properties | 1401-21T / 4101-21 |
| Viscosity 1401-21 Resin, 77°F: | 2,300 - 2,700 cps (thixotropic) |
| Viscosity 4101-21 Slow Hardener, 77°F: | 20 cps |
| Viscosity of 4101-21 Fast Hardener: | 50 cps |
| Mix Ratio, Resin to Hardener: | 100:30 by weight |
| Weight Per Gallon, 1401-21 Resin: | 9.5 - 9.6 lbs |
| Weight Per Gallon, 4101-21 Hardener: | 7.9 - 8.1 lbs |
| Weight Per Gallon, Mixed: | 9.2 lbs |
| Mixed Viscosity, 77°F: | 350 - 550 CPS (thixotropic) |
Gel Time Recipe Table
Rhino 1401-21 Resin, 100 parts / Rhino 4101-21 (all), 30 parts:
| Get Time, 150 grams at 77°F | Percent of 4101-21 Slow | Percent of 4101-21 Fast |
| 360 minutes | 100% (30PHR) | - |
| 240 minutes | 90% (27PHR) | 10% (3PHR) |
| 100 minutes | 75% (23PHR) | 25% (7PHR) |
| 70 minutes | 60% (18PHR) | 40% (12PHR) |
| 40 minutes | - | 100% (30PHR) |
Resin Mixing Basics
Condition epoxy resin and hardener to between 20ºC and 35ºC (68ºF to 95ºF) to ensure proper mixed viscosity. Introduce mixed material onto part or reinforcement(s). Curing temperature(s) between 40ºC and 65ºC (104ºF to 149ºF). Hold at this temperature for between 4 and 6 hours. Cure temperatures may be from 50°C to 85°C to accomplish maximum HDT. Optimum cure time(s) versus temperature(s) will depend on parameters such as part thickness or size.
Reinforcement Types
Advantages of Rhino 1401-21 Epoxy Resin
Due to the highly thixotropic nature of 1401-21T epoxy resin, it is possible to laminate thick sections without vertical drainage of the epoxy resin. Rhino 1401-21T Epoxy Resin is formulated to improve the intimate bond between the epoxy resin and E-glass or carbon fiber reinforcements. This formulation technique results in increased physical properties as follows:
| • Fiber Pull-Out Strength | • Tensile Strength and Modulus |
| • Flexural Strength and Modulus | • Compressive Strength |
| • Impact Resistance | • Inter-Laminar Shear Strength |
Of equal, if not greater significance is the retention of the above properties after exposure to heat, cycle fatigue, water, expected adverse environmental reagents such as salt spray, acid rain, etc. The formulation of 1401-21T Epoxy Resin results in minimal degradation of the cured composite’s physical properties as compared to epoxy resin systems not containing the proprietary formulation constituents of 1401-21T Epoxy Resin. The benefit to the composite fabricator is obvious and clear: Increased product life and confidence!
Cured Physical Properties of Composite
A-260 unidirectional E-glass (epoxy compatible rovings) with Rhino 1401-21T Epoxy Resin and 4101-21 Epoxy Hardener (70:30 glass to resin ratio). Cure schedule - 2 hrs at 35ºC (infusion) / 4 hrs at 65ºC (basic cure) / 2 hours at 85ºC (final cure).
| Property | Result | Test Method |
| Tensile Strength: | 83,000 psi | ASTM D-638 |
| Tensile Modulus: | 5,250,000 psi | ASTM D-638 |
| 90° Tensile Strength: | 6.05 ksi | ASTM D-3039 |
| In-Plane Shear Strength (4 plies + 45°) | 9.14 ksi | ASTM D-3518 |
| Flexural Strength: | 86,000 | ASTM D-790 |
| Flexural Modulus: | 2,490,000 psi | ASTM D-790 |
| Izod Impact: | 44.5 ft/lb/in | ASTM D-256-A |
| Water Absorption: | 0.09% | ASTM D-570 |
| Barcol Hardness: | 64 | - |
Cured Physical Properties of Neat Resin
Rhino 1401T-21 Epoxy Resin, 100 parts, Rhino 4101-21 Epoxy Hardener, 30 parts. Cured 2 hrs at 35ºC (infusion) + 4 hrs at 65ºC (basic cure).
| Property | Result | Test Method |
| Tg (DSC): | 194°F (90°C) | IPC-TM-650, 2.4 - 2.5 |
| Shore D Hardness: | 90D | Rhino |
| Tensile Strength: | 10.30 ksi | ASTM D-638 |
| Ultimate Elongation: | 7.4 - 7.5% | ASTM D-638 |
| Tensile Modulus: | 465 ksi | ASTM D-638 |
| Ultimate Compressive Strength | 14,500 psi | Sandia Labs Method |
| Flexural Strength: | 18.65 ksi | ASTM D-790 |
| Flexural Modulus: | 430 ksi | ASTM D-790 |
