Sealants

Two sets of sealants were employed in this study.

Set 1: Eight sealant products, all commercially available in Japan, with one sealant product from each chemical family (see Table 1) typically used in Japan, conforming to JIS A 5758 [4] and tested in accordance with JIS A 1439 [5], were used for the outdoor exposure test in Yamanashi Prefecture (see Fig. 3).

Set 2: Six sealant products, all commercially available in Japan, selected from different chemical families (see Table 2), were used to carry out the out­door exposure test in Choshi City and the accelerated artificial exposure test.

I Adding transformation

I Position change

FIG. 2—Process of joint transformation.

Copyright by ASTM Int’l (all rights reserved); Tue May 6 12:07:08 EDT 2014

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)

0.13

0.49

550

2 part modified silicone (stress relaxation type)

MS-2(SR)

0.17

0.52

550

1 part modified silicone

MS-1

0.12

0.51

800

2 part polysulfide

PS-2

0.19

0.56

350

2 part polyurethane

PU-2

0.11

1.15

790

1 part polyurethane

PU-1

0.18

0.97

800

TABLE 1—Sealant tested, set 1.

Physical Properties3

aBased on JISA 1439.

TABLE 2—Sealant tested, set 2.

Sealant

Mark

Physical Propertiesa

50 % M, N/mm2

Tensile Strength, N/mm2

Elongation,

%

2 part silicone

SR-2

0.14

0.81

1170

2 part modified

MS-2

0.15

0.49

650

1 part modified

MS-1

0.12

0.56

560

2 part polyurethane

PU-2

0.15

0.53

570

1 part polyurethane

PU-1

0.14

1.03

950

aBased on JIS A 1439.

The following legend is applied throughout this paper in order to expediently identify the different sealants during the test: SR, silicone; IB, poly-isobutylene; MS, modified silicone (silane modified polyether); PS, polysulfide; PU, polyur­ethane; 1, one part; 2, two parts; GP, general purpose; SR, stress relaxation type.