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Product

Basic Property

Property Unit Test method PB
Physical Property Specific gravity - ASTM D1505 0.937
Hardness D scale ASTM D2240 D60
Absorption rate mg/㎠ JIS K7209 0.01 or less
Mechanical Property Yield tensile strength kgf/㎠ ASTM D368 170
Break tensile strength kgf/㎠ ASTM D368 340
Fracture tensile rate % - 250
Elastic modulus kgf/㎠ ASTM D638 2,700
Possion - - 0.38
Impulse strength kgf/㎠ JIS K7110 45
Thermal Property Coefficient of linear expansion ℃-1 D696 1.3X10-4
Specific heat ㎈/g℃ - 0.5
Heat conductivty ㎉/m.hr.℃ C177 0.33
Melting point ℃ DTA 124℃-126℃
Temperature Bromide ℃ JIS K7216 -18℃
Electronical Property Volume resistance Ω*cm ASTM D257 1017 or more
Withstand voltage ㎸/mm ASTM D149 38

Basic Property

Working pressure(Kg/㎠)
20℃(50years) 40℃(50years) 60℃(50years) 70℃(50years) 80℃(25years) 90℃(10years)
16.32 13.97 10.71 8.98 7.55 5.00

Physical Property

Heat conductivty
PB pipe has lower rate of heat conduction and heat loss than do metal pipe
therefore, it is more effective for hot water to flow through PB pipe than metal pipe.
Thermos materials can be used over the pipe if you need to avid heat loss
PIPE Thermal Conduction Factor ㎉/m.hr.℃ The Proportion to PB Pipe
PB PIPE 0.33 1
STAINLESS PIPE 14 7
STEEL PIPE 50 250
ALUMINIUM PIPE 180 900
COPPER PIPE 340 1,700
Coefficient of linear expansion
The rate of linear expansion on PB pipe is 1/60 metal pipe therefore, when PB pipe is laid on
concrete and soil, the fiction of concrete is sufficient to hold the expansion of the pipe.
For these reasons, heat expansion of the pipe is not an issue
Materials Coefficient of Expanssion(℃-¹) Drawing Elastic Rate(kgf/㎠)
PB PIPE 1.3~1.5X10-4 4,000
STAINLESS PIPE 0.09~0.1X10-4 2,800,000
STEEL PIPE 0.1~0.11X10-4 2,100,000
COPPER PIPE 0.17~0.18X10-4 1,100,000
The Fusion of freezing
The picture below shows the results of repeating test concerning the fusion of freezing in PB pipe.
The method of the test is to fill up the pipe being used for the test with water and repeat freezing and melting in the cycle of 20C, 16hr, 20C, 8hr.
The result of the test is that PB pipe doesn’t freeze and brust. It shows that PB pipe elastic enough to absorb cubical expansion to water.
But the result can’t be applied to plumbing without revision.
파이프팽창율

- The result of the test is that PB pipe doesn't freeze and brust. It shows that PB pipe elastic enough to absorb cubical expansion to water.
But the result can't be applied to plumbing without revision. For example, when the entire long pipe is frozen, there is no problem if all of them are frozen at the same time.
However, if the volume increase due to freezing is concentrated on a part of the pipe, there is a possibility of breakage. For example, when the entire long pipe is frozen, there is no problem if all of them are frozen at the same time. However, if the volume increase due to freezing is concentrated on a part of the pipe, there is a possibility of breakage.