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Adhesives
Adhesives
Manufactured Products
 
Precision UV-Curable Adhesives
(AT4291A, AT9290F)

Features

  • Low shrinkage during curing (3% or less).
  • Low thermal expansion coefficient (2 * / or less).
  • Adhesion/fixation at submicron levels is possible because displacement of bonded subjects during curing or from temperature changes is so small.
  • Turns transparent when cured (AT9290F).
  • Easy to check the degree of curing and able to cure large depth (AT9290F).

Fig. Thermal properties of LD modules
fabricated with precision adhesive.

Fig. Thermal expansion coefficient
and shrinkage during curing


Comparison of

a) :precision UV-curable adhesives (a=2 * /) and
b) :general-purpose UV adhesives (a=30 * /)

 

a: thermal expansion coefficient


Main properties of Precision Adhesives
(AT4291A, AT9290F)

Name (Main Components)

AT4291A
(Epoxy)

AT9290F
(Epoxy)

Conditions (Viscosity)) [25]

Milky white viscous liquid (approx 27,000cP)

Milky white viscous liquid
(> 27,000 cP)

Curing

Curing Time (min)

10 *1

10 *2

Shrinkage during curing (%)

2~3

1~2

Depth of cure (mm)

~5

~8

Properties after curing

Thermal expansion coefficient ( )

2

< 4

Hardness (Shore D) [25]

92

89

Glass Transition Temperature ()

209

134 ~147

Adhesion Strength
(Kgf/cm2) [Glass]

>116

> 200


(Note)
Not able to use in the optical path. This property data is a measured value on samples instead of the guaranteed value.
Recommended curing process :

*1 UV irradiation : 30mW/cm2 (365nm) Heat treatment : 120 ~150 for 30~ 60min
*2 UV irradiation : 30mW/cm2 (365nm) Heat treatment : 60 ~100 for 1h

 

 
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