HDPE PIPE ISO4427-1996

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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:Should I clean out my hamsters tubes already?
I think that you should probably clean it out. Do it at night when he is not in the tubes so you do not disturb him. My hamster sleeps in an attachment that goes on the tubes and she does the same thing with the food, pooping, and peeing in there. She loves when I clean it out for her, I do it about every 2-3 days. If I do not clean it out and wait an extra day if I am busy or something she takes all of the bedding out of it and moves it to the regular cage area herself. So yes I do think that you should clean it, he will probably appreciate it!
Q:Plastic tube how to link three links?
You can do it yourself. Remember, in the pipe connection, the best combination of the use of fine shar slightly hit point, glue after 12 hours don't try.
Q:How do I heat the thin plastic tube?
Generally do not use thin plastic tube heating, if it must be heated, it must be heated water bath, to prevent the temperature is too high and burned containers.
Q:If you filled up a plastic tube with saturated salt water and used the tube as a solenoid around a nail,?
Only if a current(which would be limited by the resistance of the salt water or copper) was applied.So your question is which has less resistance per unit of cross section.Which would be copper.So the answer is no it wouldn't be more efficient(excess heat).Besides to do so would be a hard task what with leaks,space for the plastic tube etc. since the field is determined by ampere turns.
Q:Attaching a plastic tube to a wood rod?
Drill a hole in the wood and glue the tube into it. Does it have to be wood? It might be better to use a block of plastic and drill a hole instead of trying to attach a tube.
Q:why does the toothpaste doesnt react with tube in which its filled?
Because the inner side of the tube is designed not to react chemically with the contents (the same for remedies, facial creams etc, not only for tooth paste)
Q:Dog may have eaten Chapstick and the tube itself!?
He will either pass it in a day or two. Watch his stools for it. Or if he stops pooping, you will need to take him to the vet because it could be causing a blockage in his intestines. Hopefully, he will just pass it.
Q:vacuum cleaner plastic hose and steel extension tube are stuck.?
the cooking oil is a great idea. also sometimes some of them need twisting
Q:I need to find plastic test tubes w/ some kind of a rack for Halloween party??
What a cool idea....How about a restaurant supply store, or even a school supply store...they might have them in the science section. Good luck, (I might even steal it)
Q:What is the name of the plastic tubing that has electrical wiring in it, and is used under concrete?
Depends where you are, if in central europe, plastic conduit is often used when wiring houses under concrete but it doesn't offer any mechanical protection against a drill bit. If in UK, spec would say that if not a SWA, you will need to run copex, monical each end and connect the earth to it. As soon as the drill bit hits a neutral or live inside the cable after going through the copex, RCD kicks in.

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