hot melt adhesive for bookbinding

Test item

Standard

remark

Back

Side

1

Appearance

white or light yellow solid

white or light yellow solid

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2

Melt viscosity(180℃),Pa.s

2.2-6.0

1.6-2.7

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3

Softening point,℃

≥82

≥74

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4

tensile strength,Mpa

≥3.0

≥2.5

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5

Elongation at break %

≥300

≥300

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6

Hardness (Shaw A), degree

80-92

75-85

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7

thermal stability(180℃X24h)

no color turns black or scorched,

no color turns black or scorched,

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8

Brittleness temperature ℃

≤ -1

≤ -1

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