Experimental Procedures

Sealants and Tested Sealants

Eight sealants, commercially available in Japan (see Table 1), which are con­forming to JIS A 5758 [3] and are tested in accordance with JIS A 1439 [4], were used to carry out the exposure test.

The configuration of the test specimen that enabled exposure of the sealant to continuous degrees of extension and compression in a single specimen is shown in Fig. 1.

TABLE 1—Sealants tested.

Physical Propertiesa

Sealant

Mark

50 %M.

(N/mm2)

Tensile

Strength

(N/mm2)

Elongation

(%)

2 part Silicone

SR-2

0.14

0.81

1170

2 part Polyisobutylene

IB-2

0.11

0.38

490

2 part Modified Silicone (General Purpose type)

MS-2

(GP)

0.15

0.49

650

2 Part Modified Silicone (Stress Relaxation type)

MS-2

(SR)

0.12

0.43

480

1 part Modified Silicone

MS-1

0.12

0.56

560

2 part Polysulfide

PS-2

0.14

0.40

550

2 part Polyurethane

PU-2

0.15

0.53

570

1 part Polyurethane

PU-1

0.14

1.03

950

aPhysical Properties: based on JIS A 1439.

Experimental Procedures
Подпись: (Fixed specimen)
Подпись: Sealant

Подпись: (Changeable specimen)

Подпись: (Unit: mm)
Подпись: Rotary pm

image217Bond breaker

FIG. 1—Test specimen.