EZ-84 Epoxy

X30 2-part foam

General Description

EZ84 is a 2-part structural epoxy.  The resin is clear in color, and has a tendency to form crystals with age.  The crystals can usually be reabsorbed if you immerse the container in very warm water.  The hardener is honey colored when new, flowing quite easily, but turns to a dark brown and molasses consistency with age.  Old hardener can be made to flow better with carefully applied heat, such as with a paint gun.

Velocity Use

EZ-84 is the primary structural epoxy for the Velocity kit. All structural glass lay-ups are preformed with this system, such as wings, fuselage, etc. Velocipoxy is the preferred system for metal bonding.

Product Description

From the Aircraft Spruce website:  In early 1996, Composite Design Co. developed E-Z Poxy to provide a replacement epoxy system for Epolite (Safe-T-Poxy) which is no longer produced by Hexcel.  The E-Z Poxy series of laminating systems utilizes one resin and your choice of three hardeners for varying pot life and viscosity requirements.  The E-Z Poxy systems offer the same handling and physical properties as the discontinued Epolite systems including ease of use, long pot life, rapid cure for demold or process continuation, and superior room temperature curing properties.  Excellent for use in sport aviation, marine, and industrial applications.

E-Z 83 hardener is equivalent to Safe-T-Poxy standard hardener, E-Z 84 is equivalent to Safe-T-Poxy II hardener, and E-Z 87 is equivalent to Safe-T-Poxy slow hardener.  E-Z Poxy products should not be mixed with materials produced by other epoxy manufacturers.

Product Specifications

From the Aircraft Spruce website:  

E-Z POXY TECHNICAL DATA
E-Z POXY RESIN SYSTEMS FROM COMPOSITE POLYMER DESIGN
E-Z 10 Epoxy Resin		E-Z 84 Aromatic Amine Hardener
E-Z 83 Aromatic Amine Hardener		E-Z 87 Aromatic Amin Hardener
E-Z 10 Resin (Viscosity 1500 cps @ 77F) with:
Hardener	EZ 83	EZ 84	EZ 87
Mixed Properties:
Mixed Viscosity cps @ 77F*	1300	800	1500
Viscosity Hardener cps @ 77F*	410	140	830
Pot Life @ 77F	2 hours	2 hours	5 hours
Tack Free @ 77F	4 hours	8 hours	8 hours
Cure Time @ 77F	24 hours	3 days	3 days
Mix Ratio by Volume	100/47	100/47	100/47
Mix Ratio by Weight	100/44	100/44	100/44
Physical Properties Tg (F):
R/T	151	151	142
P/C*	196	196	196
Elongation %	3.5	3.5	3.9
Specific Gravity	1.14	1.13	1.14
Linear Shrinkage @ 23C (4 days %)	.10	.10	.10
Tensile Strength PSI:
R/T	8,200	8,100	8,400
P/C	10,000	10,000	10,000
Tensile Modulus (PSI x 10 -5)	4.8	4.2	4.0
Viscosity may vary +/- 10%
Post Cure for 2 hrs. @ 150F

Safety and Handling

Here are the manufacturer's Material Safety Data Sheets.
Media:EZ-83_84_87.pdf