rudder pintle bush RISHO KOGYO CO., LTD. rudder pintle bush Insulating material / Industrial plastic marine bearing

　Status of Certification of Rudder pintle bush　　　　　(2023/8/1)


Abbreviation	Nationality	Official name of certification organization	Available period （Year）	PR-2222		PR-2123
Abbreviation	Nationality	Official name of certification organization	Available period （Year）	Contact presuure (N/mm²)	Lubrication condition	Contact pressure (N/mm²)	Lubrication condition
ＮＫ	Japan	Nippon Kaiji Kyokai	5	7.0	Water	10.0	None specified
ＡＢＳ	United States	American Bureau of Shipplng	5	7.0		10.0
ＬＲ	United Kingdom	Lloyd’Register of Shipping	5	10.0		10.0
ＢＶ	France	BUREAU VERITAS	5	7.5	None specified	7.5
DNV	Norway Germany	DNV (DET NORSKE VERITAS)	5	7.5	Water	10.0
ＫＲ	Korea	Korean Register of Shipplng	5	7.0		10.0
ＣＣＳ	China	China classification society※	－	7.0		10.0

※Certification for each drawing should be decided.

installaton point

▲Installation point

abrasion test

▲Abrasion test

General properies

Test items		Unit	Test condition	PR-2222	PR-2123	Test method
Flexural strength	Vertical to layer	MPa	Ａ	86	138	JIS K 6911 5.17
Flexural modulus	Vertical to laye			4813	6116	JIS K 6911 5.17
Compressive strength	Vertical to laye			211	282	JIS K 6911 5.19
Compressive strength	Parallel to laye			177	180	JIS K 6911 5.19
Compressive elastic mudulus	Vertical to laye			5694	7915	JIS K 6911 5.19
Compressive elastic mudulus	Parallel to laye			5392	6443	JIS K 6911 5.19
Tensile strength	Parallel to laye			54	76	JIS K 6911 5.18
Tensile modulus of elasticity	Parallel to laye			9743	15357	JIS K 6911 5.18
Cleavage strength		kN		8.90	9.42	JIS K 6911 5.22
Izod impact strength	Parallel to laye	Ｊ／ｍ		83	69	JIS K 6911 5.21
Appearance after heat treatment		一	E－2/130	Not particular	Not particular	JIS K 6911 5.23
Water absorption		％	E－24/50 +D－24/23	0.51	0.32	JIS K 6911 5.26
Specific gravity		一	Ａ	1.29	1.36	JIS K 6911 5.28
Rockwell hardness	Ｍ scale	一	Ａ	83	95	JIS K 6911 5.16
CTE（TMA）	Vertical to laye	1/℃	A（25～100℃）	4.8×10^-5	4.7×10-⁵	JIS C 6481 5.19
Thermal conductivity		W/(m･k)	Ａ	0.31	0.33	Schrader
Frictioncoefficient （Unlubricated）	1.0 MPa loading	-		0.43	0.26	JIS K 7218 A
Abrasion rate (High load abrasion test)		％		1.2（※）	1.6（※※）	RISHO's standard (NK certificated)
Radial thickness change (High load abrasion test)		％		1.4（※）	1.7（※※）	RISHO's standard (NK certificated)

※　　Test result of 7.0N/mm² ×100hr. under water lubrication

※※　Test result of 10.0N/mm² ×100hr.without water lubrication

The above figures do not show guarantted value but show test results at our laboratory.