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Physical properties[edit]

Polyethylene is a thermoplasticpolymer consisting of long hydrocarbon chains. Depending on the crystallinity and molecular weight, a melting point and glass transition may or may not be observable. The temperature at which these occur varies strongly with the type of polyethylene. For common commercial grades of medium- and high-density polyethylene the melting point is typically in the range 120 to 180 °C (248 to 356 °F). The melting point for average, commercial, low-density polyethylene is typically 105 to 115 °C (221 to 239 °F).it is transprant.

Chemical properties[edit]

Most LDPE, MDPE and HDPE grades have excellent chemical resistance, meaning that it is not attacked by strong acids or strong bases. It is also resistant to gentle oxidants and reducing agents. Polyethylene burns slowly with a blue flame having a yellow tip and gives off an odour of paraffin. The material continues burning on removal of the flame source and produces a drip.[3] Crystalline samples do not dissolve at room temperature. Polyethylene (other than cross-linked polyethylene) usually can be dissolved at elevated temperatures in aromatic hydrocarbons such as toluene or xylene, or in chlorinated solvents such as trichloroethane or trichlorobenzene.[4]


SDR33 SDR26 SDR17.6 SDR13.6 SDR11
公称压力 PN,Mpa
0.32 0.4 0.6 0.8 1.0
16        2.3
20      2.3 2.3
25    2.3 2.3 2.3
32    2.3 2.4 2.9
40  2.3 2.3 3.0 3.7
50  2.3 2.9 3.7 4.6
63 2.3 2.5 3.6 4.7 5.8
75 2.3 2.9 4.3 5.6 6.8
90 2.8 3.5 5.1 6.7 8.2
110 3.4 4.2 6.3 8.1 10.0
125 3.9 4.8 7.1 9.2 11.4
140 4.3 5.4 8.0 10.3 12.7
160 4.9 6.2 9.1 11.8 14.6
180 5.5 6.9 10.2 13.3 16.4
200 6.2 7.7 11.4 14.7 18.2
225 6.9 8.6 12.8 16.6 20.5
250 7.7 9.6 14.2 18.4 22.7
280 8.6 10.7 15.9 20.6 25.4
315 9.7 12.1 17.9 23.2 28.6
355 10.9 13.6 20.1 26.1 32.2
400 12.3 15.3 22.7 29.4 36.3
450 13.8 17.2 25.5 33.1 40.9
500 15.3 19.1 28.3 36.8 45.4
560 17.2 21.4 31.7 41.2 50.8
630 19.3 24.1 35.7 46.3 57.2

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Q:how do i make a solar hot water system using a black rubber tube?
Do a search on Youtube for solar water heater.
Q:How to remove plastic tube out of the car oil pan? How will the plastic damage the engine?
Not good. The plastic could conceivably block the oil pump, causing a catastrophic loss of oil preeure. I'd recommend you drive it to your closest mechanic and have him drop the oil pan and remove it. It'll cost a lot of money, but not nearly as much as having the motor go away due to no oil.
Q:How do I connect the cast iron sewer line with the PVC pipe?
With expansion joint, or quick joint, the expansion joint is cheaper and faster. In any plumbing shop there is a retractable knot. Will need to replace the cast iron pipes sawed off, the new PVC tube into the cast iron pipe of about 100mm, with the PVC pipe fixing clamp. Then in the gap between the PVC pipe and the cast iron pipe, the cement mortar can be used for grinding. When connecting, the outer wall of the cast iron pipe can be polished with gauze to prevent leakage.
Q:How can I rescue a plastic tube flushed down the toilet?
Put a mask and snorkel on and dive in to try and find it.
Q:How do I heat the thin plastic tube?
Then I think we should control the temperature, the maximum is not more than 100 degrees C, the general melting point of plastic will not exceed 200 degrees C
Q:About plastic drain pipe expansion joint
Vertical pipe expansion joint setting drainage pipe crossing part is fixed support, when the riser length is not more than 4m, should be provided with a telescopic section of each layer; when the interlayer pipe length is greater than 4m, the number of expansion joints should be calculated according to the pipe deformation and expansion joints allow the expansion amount calculation sure. The riser passes through the floor without blocking the floor, the maximum distance between the expansion joints is 4m, and the expansion joint should be fixed. A connecting pipe is arranged on the upper part of the upper part of the floor when the floor is near, and a telescopic joint is arranged above the confluence pipe. When the converging pipe is arranged at the lower part of the floor, a telescopic joint is arranged at the lower part of the confluence pipe.No horizontal pipe access in the floor, 1.0~1.2m can be located on the ground expansion joints.
Q:I have a GE Refrigerator PCF23MGWCC the water dispenser tube on the outside front has a hard yellow substance?
Sounds like sulphur. You must have sulphur in your water. Scrap it off and expect to have to do it again. Good luck I believe the GE models the tube is foamed in place not changable by itself. The entire door would have to be changed out. very expenssive. Try a small bottle type brush to clear it. Good luck
Q:How do I connect my new fridge to the old water tube?
You shouldn't have to change the tubing all refers as far as I know come with a 1/4 in line. Get a adapter from Home Depot or Lowe's and you should be good to go. You might cut off a small piece of you old tubing and the fitting on the refer and take them with you that should help a lot. Good Luck
Q:What is the strongest cast tube plastic?
polybutylene or chlorinated polyvinyl chloride
Q:Why, in general, the strong tube is plastic tubes, weak tubes are metal tubes?
The metal tube can be grounded to shield, eliminate interference, and reduce the electromagnetic interference between the weak current

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