HDPE PIPE ISO4427-2000 DN20

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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]

GB/T13663-2000：

PE63管材规格
公称外径dn，mm	SDR33	SDR26	SDR17.6	SDR13.6	SDR11
	公称压力 PN,Mpa
	0.32	0.4	0.6	0.8	1.0
	公称壁厚	公称壁厚	公称壁厚	公称壁厚	公称壁厚
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

Q:This is for silver eagles, silver maple leafs, and silver rounds that i have stored in plastic coins tubes. I have been using cotton balls stuffed into the top to take up air space and prevent sliding around; but will this damage the silver?: Cotton balls work fine, and won't damage the silver IF they are clean and you don't shake the tubes a lot. (Coin companies use cotton balls when shipping coins in tubes if needed.)

Q:i wanted to kno what cigars come in the plastic cigar tubes ive only seen the tubes in red and orange but i wanted to kno the brand thnx: Some cigars come in plastic tubes and many of them in red and orange packaging. More details would help.

Q:i have some rolls of presidential dollar coins. do i need the tubes or can i just leave them in the paper?: It okorder they are a large coin and stamp supply company. Very few paper type coin rolls are of top quality and archival, most have acid in the paper.

Q:How can the PPR pipe be connected with the metal tube?: This is a water storage type electric water heater installation and use of PP-R material, and is connected with the water heater outlet and below the triangle valve components is a special joint installed in the water heater, the components are used to transition metal tube connected with the plastic pipe, the connecting way is to facilitate future maintenance.

Q:My child is 4 years old. She had a small plastic tube inserted to open up her tear ducts. The tube fell out that same night as the procedure. What can I do? Will she need another surgery?: I think this is a question for the specialist. Call them immediately. I would rather than asking strangers- grab the phone book, call after hour number and get the proper answer there. I hope that she is okay. I hope that she will not need more surgery. I speculate that since it was unsuccessful that she will require it.Though, I am no doctor. I don't mean to be cross, I just hope you call them, regardless of what time it is. There is always an after hours on-call doctor to help! Good luck to you and your daughter!

Q:When i go to my local fish store some tanks have a small piece of PVC pipe in them, its just sitting on the bottem of the tankwhats it for?: fish hide in them. a make-shift cave.

Q:How do you prevent plastic tubes from warping in direct sunlight?: One way to prevent plastic tubes from warping in direct sunlight is to use UV-resistant or weather-resistant plastic materials. These types of plastics are specifically designed to withstand prolonged exposure to sunlight without warping or deforming. Additionally, you can also apply a protective coating or paint with UV inhibitors to the surface of the tubes, which can provide an extra layer of protection.

Q:Are plastic tubes suitable for retail packaging?: Yes, plastic tubes are suitable for retail packaging. They provide durability, flexibility, and transparency, making them ideal for displaying products and protecting them from damage. Plastic tubes also offer a wide range of customization options, allowing for attractive branding and marketing.

Q:What does "DN" and "Dn" mean in plastic pipes? And de?: Plastic pipe, DN said nominal outer diameter, since 2002, the national standard provides DN plastic pipe nominal outer diameter, the abolition of the past Dn, De, de and other several forms of expression. Before that, use Dn, De, De to indicate nominal outside diameter, outer diameter, etc..

Q:What are the common fittings used with plastic tubes?: Some common fittings used with plastic tubes include compression fittings, push-to-connect fittings, barbed fittings, and threaded fittings.

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