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Shock-Absorbing Film Allows Thin, Impact-Resistant Laminated Glass
Contributing to the Vehicle Weight Reduction

Shock-Absorbing Film

Applicable Business Areas

Manufacturers of laminated glass for vehicles, manufacturers of laminated glass for building materials

Target Applications

Laminated glass

Shock-absorbing film developed by Hitachi Chemical has superior shock dispersion ability and therefore achieves anti-shock and shock-absorbing functions that are three times better than conventional intermediate films used in laminated glass (according internal test methods). This resin can contribute to weight reduction while maintaining the anti-shock ability of the laminated films in both laminated automotive and architectural glass.

Innovative Solution

Thinner, Light-weight Laminated Glass for Automotive

Since intermediate film resins used traditional glass are hard, they do not disperse or absorb shock, concentrating it locally instead. In contrast, Hitachi Chemical’s shock-absorbing film maintains the flexibility (at the molecular level??) and can therefore disperse or absorb shock. The shock-absorbing function is up to three times superior (0.0567 J/cm2) to that of conventional intermediate resin films. This function allow glass to be thinner and lighter while maintaining comparable strength to conventional laminated glass.

Product Features

Anti-shock ability that is three times superior to that of conventional intermediate film resin

Evaluation data comparing traditional 6mm float glass, laminated glass using competitor’s resin and Hitachi Chemical shock absabing film (glass-resin-glass)

Float glass 6mmt

Laminated glass using non-Hitachi Chemical’s materials

Laminated glass using Hitachi Chemical’s materials

Structure

Float glass 6mmt

Float glass 2.8mmt

Non-Hitachi Chemical's material 0.38mmt

Hitachi Chemical's material 0.10mmt

Float glass 2.8mmt

Optical properties
(Reference: air)

T.T

89.41

91.48

91.5

Haze

0.22

0.14

0.13

L*

95.75

96.61

96.63

a*

-1.43

-0.32

-0.19

b*

0.37

0.62

0.21

Anti-shock property*
(Anti-crack energy)

J/cm2

0.0147

0.0172

0.0567

* Anti-shock property evaluation (iron ball drop test) method

Weight of iron ball (kg)× Drop height (m) × 9.8 / 100 = Anti-crack energy (J/cm2)

Description of Iron Ball Drop Test
  • Outline of test
    “The test conforms to ISO12543. In this test, a 1kg iron ball is dropped from varying heights to determine the average maximum height it can be dropped from without causing the material to crack.  This information was then used to determine the impact resistance (anti-crack energy) of the glass using the equation above.”

  • A schematic of the jig is shown in the figure below
    Jig material: SUS
    Bolt material: SUS

  • Glass sample: 11 cm x 11 cm needs to reference that the test area had dimensions of 10x10
    Clamp the glass with the abovementioned jig.

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