Table 1 Composition and treatment conditions of samples

Non-aged samples

NAg-1

Bovine bone glue + Fe₂O₃ powders

NO.63000, Kremer

25 ℃, RH 40%

6 months

NAg-2

Cowhide glue + Fe₂O₃ powders

NO.63020, Kremer

NAg-3

Rabbit skin glue + Fe₂O₃ powders

NO.63028, Kremer

NAg-4

Bookbinder glue + Fe₂O₃ powders

NO.63060, Kremer

Aged samples

Ag-0

Rabbit skin glue + Fe₂O₃ powders

NO.63028, Kremer

After 6 months, 100 ℃

0 h

Ag-1

300 h

Ag-2

600 h

Ag-3

1000 h

Ag-4

1500 h

Ag-5

2000 h