General Properties

PB resin is a polymer made by synthesizing butene-1 and is a polyolefin-based composite with high crystallinity.

Properties Unit Test Method Property Limit
Physical Properties Importance - ASTM D1505 0.937
Hardness D scale ASTM D2240 D60
Absorption Rate mg/㎠ JIS K7209 0.01 or below
Mechanical Properties Tensile Yield Strength kgf/㎠ ASTM D638 170
Tensile Breaking Strength kgf/㎠ ASTM D638 340
Tensile Fracture Stretching % - 250
Elastic Modulus kgf/㎠ ASTM D638 2.700
Possion - - 0.38
Impact Strength kgf/㎠ JIS K7110 45
Thermostatic Properties Creep ℃-1 D696 1.3 x 10-4
Specific Heat cal/g℃ - 0.5
Thermal Conductivity kcal/m.hr.℃ C177 0.33
Melting Point ℃ DTA 124℃~126℃
Brittle Temperature ℃ JIS K7216 -18℃
Electrostatic Properties Volume Resistivity Ω.com ASTM D257 1017 or above
Withstand Voltage kv/mm ASTM D149 38

General Properties

PB resin is a polymer made by synthesizing butene-1 and is a polyolefin-based composite with high crystallinity.

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

Thermal Conductivity

PB pipes have the advantages of less thermal conductivity and less heat loss than metal pipes. Therefore,
hot water flows more efficiently than metal pipes. However, for long-distance piping and piping that minimizes heat loss, use a thermal insulation material.

Material of Pipies Thermal Conductivity Coefficient ㎉/m.hr.℃ The Ratio of PB Tube to 1
PB Pipies 0.33 1
Stainless Pipies 14 7
Steel Pipes 50 250
Aluminum Pipes 180 900
Copper Pipies 340 1.700

Linear Expansion Coefficient

Since the thermal expansion and contraction force of the PB pipe is about 1/60 of that of the metal piping material,
the PB pipe of the drowned pipe can hold the expansion and contraction of the pipe enough for the friction of soil or concrete
when it is buried in concrete. For this reason, thermal expansion and contraction of the PB pipe is not usually considered.

Materials Linear Expansion Coefficient (℃-¹) Tensile Elastic Ratio (kgf/㎠)
PB Pipies 1.3~1.5x10-4 4,000
Stainless Pipies 0.09~0.1x10-4 2,800,000
Steel Pipes 0.1~0.11x10-4 2,100,000
Copper Pipies 0.17~0.18x10-4 2,100,000

Freezing and thawing resistance

The graph below shows the results of repeated tests of freezing and thawing PB pipes.
The test method is to fill the test pipe with water and repeat the freezing and thawing cycles of [-20 ℃ / 16hr ↔ 23 ℃ / 8hr].

PB pipes are not frozen in the test results. This indicates that the PB pipe is flexible enough to absorb the volumetric expansion of water by freezing.
However, this test uses a short tube, so you should not apply this result to actual piping. For example, if the entire length of a long pipe is frozen,
there is no problem if the entire pipe is frozen at the same time. However, if the volume increase due to freezing is concentrated on a part of the pipe,
it may be damaged. Therefore, in case of piping where there is a risk of freezing of any piping material, please take anti-freezing measures such as using antifreeze,
removing water or keeping warm.