1401-21T / 4101-23

Thixotropic Epoxy System for hand Laminating at Ambient Cure –

Multifunctional epoxy and cycloaliphatic-amine blend hardener for high performance composite parts. One hour pot life, with fast cure development at typical ambient temperatures. Thixotropic resin will not drain from laminate.

_images/medium/12231147021401-21T - 4101-23 380x308 template.jpg


Excellent combination that provides good thermal resistance, excellent fatigue and interlaminar shear strength with rapid wetting of E-glass fiber reinforcements. Rhino Linings 1401-21T Epoxy Resin is formulated for highly increased E-glass fiber compatibility. Low toxicity, low odor system. No VOCs, 100% solids.

Suggested Uses

Hand lay-up of composite fiberglass reinforced structures.

System Liquid Properties

Viscosity 1401-21 Resin, 77°F:2,500 - 3,000 cps (thixotropic)
Viscosity of 4101-23 Hardener at 77°F:150 cps
Mix Ratio, Resin to Hardener:100:30 by weight
Mixed Viscosity, 77°F:700 cps
Gel Time, 130 grams, 77°F:60-64 mins (Venus Gel Timer)
Pot Life, 200 grams, 77°F:50-60 mins (Time to reach 45°C in an unstirred mass)
Weight Per Gallon, 1401-21T Resin:9.5 lbs
Weight Per Gallon, 4101-23 Hardener:8.1 lbs

How To Use Basics

Condition epoxy resin and hardener to 20ºC – 30ºC (68ºF – 85ºF) to ensure proper mixed viscosity. Mix resin and hardener at the ratio of 100 parts 1401-21T resin to 30 parts 4101-23 hardener by weight. Introduce mixed material onto reinforcement(s), and roll to release air from laminate. In the case of hand lay-up, continue rolling until there are no “white” areas indicating incomplete fiberglass wet-out. 


A post cure of 12 hours at 130ºF will bring the composite to full cure. A cure schedule of 12 hours at 135°F or 7 days at ambient will accomplish maximum HDT. Optimum cure time(s) versus temperature(s) will depend on parameters such as part thickness or size.

Reinforcement Types

Rhino Linings 1401-21T Epoxy Resin is specially formulated for highly increased compatibility with E-glass reinforcements.

Advantages of Rhino 1401-21 Epoxy Resin

Rhino Linings Epoxy 1401-21T Epoxy Resin is formulated to improve the intimate bond between the epoxy resin and E-glass 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 Rhino Linings Epoxy 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 Rhino Linings Epoxy 1401-21T Epoxy Resin. The benefit to the composite fabricator is increased product life and longevity.

Cured Physical Properties of Composite

A-260 E-glass (epoxy compatible rovings) with Rhino Linings 1401-21T Epoxy Resin and 4101-23 Epoxy Hardener (65:35 glass to resin ratio). Cure schedule – 2 hours at 77ºF (wet out) / 12 hours at 135°F (basic cure) / 7 days at ambient temperature.


PropertyResultTest Method
Tensile Strength:83,000 psiASTM D-638
Tensile Modulus:5,250,000 psiASTM D-638
Flexural Strength:86,000ASTM D-790
Flexural Modulus:2,490,000 psiASTM D-790
Izod Impact:44.5 ft/lb/inASTM D-256-A
Water Absorption:0.09%ASTM D-570
Cured Specific Gravity1.92ASTM D-790
Barcol Hardness:64Rhino

Cured Physical Properties of Neat Resin

Rhino Linings 1401-21T Epoxy Resin, 100 parts, Rhino Linings 4101-23 Epoxy Hardener, 30 parts. Cure schedule – 2 hours at 77ºF (wet out) / 12 hours at 135°F (basic cure) / 7 days at ambient temp.


PropertyResultTest Method
Shore D Hardness:88DRhino
Heat Distortion Temperature>175°FRhino
Elongation at Tensile Strength4.5 - 5.0%Rhino
Ultimate Elongation:7.5 - 8.5%Rhino
Ultimate Compressive Strength14,500 psiRhino

How Supplied

5 Gallon Pails, 55 Gallon Drums, Intermediate Bulk Containers (IBC’s), Mfg by Rhino Linings Epoxy Division, San Diego, CA..


Rhino Equipment
Civil Engineering
Resins - 908 - 1315
Resins - 1316 - 1409
Specialty Products