Hernon ReAct 727 Technical Data Sheet

Product Description

Hernon ReAct 727 is a tough acrylic adhesive designed primarily for securing of ceramic permanent magnet segments in motor magnet bonding applications. This adhesive has also found wide acceptance in a variety of structural bonding applications due to its versatile performance capabilities.

ReAct 727 has demonstrated the ability to provide high tensile strength while maintaining excellent product flexibility. This results in tough, durable bonds with outstanding impact and peel resistance. This tough acrylic is a single component, room temperature curing adhesive which is used in conjunction with Hernon EF Activator 56.

 

Product Benefits

Improved Reliability

• • High impact and shock resistance
• • Temperature resistance: -40 to 300°F (-40 to 149°C)
• • Good gap filling properties.
• • Excellent adhesion to a variety of surfaces.
• • Consistent rate of cure from 60 to 100°F (16 to 38°C)
• • Consistent bond strength

Improved Processing

• • Fast fixturing
• • No pot life, no mixing
• • No waste problems
• • Low toxicity
• • Low odor
• • Thixotropic: facilitates dispensing/applying
• • Non-migrating on vertical surfaces
• • Increases productivity
• • Requires minimal parts cleaning
• • Easy clean-up

Cost Effective

• • Requires minimal clamping time and tooling.
• • Eliminates high energy cost needed for heat cured materials.
• • Eliminates need for mechanical clips

 

Typical Applications

• • DC motor assembly.
• • Magnet bonding.
• • Bonding pre-coated sheet metal.
• • Bonding ferrites, plastic, and metal wear strips.
• • Bonding metals with special surface treatments such as galvanized, phosphate, and dichromate surfaces.

 

Typical Properties (Uncured)

Property	Value
Base Resin	Modified Acrylic
Solids	100% – No Solvents
Appearance	Off-White, Translucent
Specific gravity @ 25°C	1.07
Viscosity @ 25°C, cP	60,000
Flash point	See MSDS

 

Typical Curing Performance

ReAct 727 is designed to be used with EF Activator 56 and cured at room temperature. Cure characteristics are measured by determining fixture time (handling time) and speed of cure.

 

Fixture Time

Fixture time is defined as the time to develop a shear strength of 0.1 N/mm².

Tested on steel lap-shear specimens, 1 side primed with EF Activator 56 and tested according to ISO 4587

Gap, mm	Fixture Time, seconds
0	≤ 25
0.25	≤ 330

 

Cure Speed

The graph below shows shear strength developed with time using EF Activator 56 on steel lap-shear specimens and tested according to ISO 4587.

 

Cure Speed vs. Temperature

Heat can be used to effect or accelerate cure when surface priming operations are undesireable. Typical heat cure conditions consist of heating and maintaining bondline at a temperature shown in the graph below for the corresponding time specified. Optimum conditions for heat cure should be determined on the actual assemblies.

 

Typical Properties (Cured)

Physical Properties

Method	Property	Value
ASTM D882	Tensile Strength, psi	2,700
ASTM D882	Modulus of Elasticity, psi	21,000
ASTM D882	Elongation, %	130
ASTM D2240	Durometer Hardness, Shore D	65

 

Typical Cured Performance

Shear Strength

Tested on lap-shear specimens with 1 side primed with EF Activator 56 and tested according to ISO 4587

Substrate	Gap, mm	RT Cure, hrs	Shear Strength N/mm² (psi)
Steel	0	24	≥ 11.7 (2500)
Steel	0	48	20.7 (3000)
Steel	0.25	48	19.0 (2750)
Steel	0.50	48	17.4 (2520)
Aluminum	0	48	13.1 (1900)
Zinc dichromate	0	48	13.1 (1900)

 

Typical Environmental Resistance

Shear Strength, steel lap-shear specimens, 1 side primed with EF Activator 56, cured for 48 hours at 22ºC and tested according to ISO 4587

 

Heat Aging

Aged for 1000 hours at temperature indicated and tested at 22ºC

Temperature	Shear Strength, N/mm² (psi)
93ºC	15.7 (2280)
121ºC	10.8 (1560)
150ºC	4.1 (600)

 

Humidity Resistance

Conditioned in 50ºC condensing humidity for time indicated and tested at 22ºC

Exposure Time	Shear Strength, N/mm² (psi)
1 week	15.7 (2280)
2 weeks	11.2 (1620)
4 weeks	4.1 (600)

 

Chemical/Solvent Resistance

Aged 30 days at 87ºC and tested at 22ºC

Chemical/Solvent	% of Initial Strength
Air Reference	100
Water Glycol 50/50	30
Gasoline	10
Motor Oil	100

 

General Information

This product is not recommended for use in pure oxygen and/or oxygen rich systems and should not be selected as a sealant for chlorine or other strong oxidizing materials.

 

For safe handling information on this product, consult the Material Safety Data Sheet (MSDS).

 

Directions For Use

1. For best performance bond surfaces should be clean and free from grease.

2. To ensure a fast and reliable cure, EF Activator 56 should be applied to one of the bond surfaces and the adhesive to the other surface. Parts should be assembled within 15 minutes.

3. The recommended bondline gap is 0.1mm. Where bond gaps are large (up to a maximum of 0.5 mm), or faster cure speed is required, EF Activator 56 should be applied to both surfaces. Parts should be assembled immediately (within 1 minute).

4. Excess adhesive can be wiped away with organic solvent.

5. Bond should be held clamped until adhesive has fixtured.

6. Product should be allowed to develop full strength before subjecting to any service loads (typically 24 to 72 hours after assembly, depending on bond gap, materials and ambient conditions).

 

Storage

ReAct 727 should be stored in a cool, dry location in unopened containers at a temperature between 46ºF to 82ºF (8ºC to 28ºC) unless otherwise labeled. Optimal storage is at the lower half of this temperature range. To prevent contamination of unused material, do not return any material to its original container.

 

Dispensing Equipment

Hernon offers a complete line of semi and fully automated dispensing equipment. Contact Hernon Sales for additional information.

貌似促进剂EF 56已经停产了，改用15代替了！

 

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