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CH2, mol.wt.=14

Cristalinity

        Low Linear: 60%

        High Density: up to 95%

Pyrolysis: melts and becomes transparent; in the absence of air is stable up to 300 deg. C.

                  Cross-linked types do not melt.

Specific gravity: Low density 0.915 to 0.94

                  High density 0.94 to 0.97

Refractive index: 1.51 to 1.52

Moisture relations: beying paraffins, polyethylenes are resistant to water; increase in weight

                    after 1 year less than 0.2%.

Thermal properties

Specific heat 0.55 at 20 deg. C, rising to 0.7 at 120 deg. C.

Coeficient of linear expansion: 0.00017 to 0.00022 for low density

                                0.00013 to 0.00020 for high density

Melting point(loss of cristalinity): 109 to 125 deg. C for low density

                                     130 to 135 deg. C for high density

Electrical properties

Resistivity 1017 to 1019  (ohm cm)

Dielectric strength 20 to 160 (kV/mm)

Dielectric constant 2.28

Mechanical properties

Elastic modulus 15.4 to 125.0 (daN/mm2)

Strain rate(mm/min)                          50           500

Yield strength(daN/mm2)                      2.28        2.36

Ultimate tensile strength(daN/mm2)           3.43        1.33

Hardness: low density, 50-60

          high density, 65-70

Impact:   low density, 0.92

          high density, 0.96

 

LDPE Low Density Polyethylene

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LEGEND
A = amorphous - Cr = crystalline - C = clear - E = excellent - G = good - P = poor - O = opaque - T = translucent- R = Rockwell - S = Shore

---

STRUCTURE: Cr  SPECIFIC DENSITY: 0.92  WATER ABSORBTION RATE (%): 0.01  ELONGATION (%): 500  TENSILE STRENGTH (psi): 1700  COMPRESSION STRENGTH (psi): 1400  FLEXURAL STRENGTH (psi): 1400  FLEXURAL MODULUS (psi): 22000  IMPACT (IZOD ft. lbs/in): NB  HARDNESS: SD55  FABRICATION   - BONDING: P   - ULTRASONIC WELDING: P   - MACHINING: P  DEFLECTION TEMPERATURE (deg. F)   - @ 66 psi: 113   - @ 264 psi: 95  UTILZATION TEMPERATURE (deg. F)   - min: -76   - max: 210  MELTING POINT (deg. F): 248  COEFFICIENT OF EXPANSION: 0.00009  ARC RESISTANCE:   DIELECTRIC STRENGTH (kV/mm):   TRANSPARENCY: T  UV RESISTANCE: P  CHEMICAL RESISTANCE   - ACIDS: G   - ALKALIS: E   - SOLVENTS: E 

Plastic Properties Technical Information

Dynalab Corp offers technical plastic properties and chemical resistance information for a variety of materials.

 

The first of the polyolefins, Low Density Polyethylene (LDPE) was originally prepared some fifty years ago by the high pressure polymerization of ethylene. Its comparatively low density arises from the presence of a small amount of branching in the chain (on about 2% of the carbon atoms). This gives a more open structure. Low Density Polyethylene (LDPE) is a most useful and widely used plastic especially in dispensing bottles or wash bottles. It is translucent to opaque, robust enough to be virtually unbreakable and at the same time quite flexible. Chemically LDPE is unreactive at room temperature although it is slowly attacked by strong oxidizing agents and some solvents will cause softening or swelling. It may be used at temperatures up to 95° Celsius for short periods and at 80° Celsius continuously. LDPE is ideally suited for a wide range of molded laboratory apparatus including wash bottles, pipette washing equipment, general purpose tubing, bags and small tanks. Dynalab Corp's plastic fabrication shop fabricates thousands of catalog and custom LDPE products. LDPE fabrication quote request. Don't see the answers to your low density polyethylene questions? It must be time to see what Mr. Plastic has to say. Mr. Plastic is a wealth of technical, practical and even some hysterical plastic advice.
		LDPE is the material of choice in laboratory dispensing and wash bottles due to its excellent flexibility and the fact that it is virtually unbreakable.

LDPE Resistance:

Excellent resistance (no attack) to dilute and concentrated Acids, Alcohols, Bases and Esters.

Good resistance (minor attack) to Aldehydes, Ketones and Vegetable Oils.

Limited resistance (moderate attack suitable for short term use only) to Aliphatic and Aromatic Hydrocarbons, Mineral Oils and Oxidizing Agents.

Poor resistance and not recommended for use with Halogenated Hydrocarbons.

LDPE Fabrication:

Weldable and machinable

Good for parts that require flexibility

Trays & containers

Food storage and laboratory

Corrosion resistant work surfaces

Very soft and pliable

LDPE Quick Facts:

Maximum Temperature: 176°F 80°C

Minimum Temperature: -58°F -50°C

Autoclavable: No

Melting Point: 248°F 120°C

Tensile Strength: 1700 psi

Hardness: SD55

UV Resistance: Poor

Translucent

Excellent flexibility

Specific Gravity: 0.92

Elastic Modulus Values ( phan 1)

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mail2 wrote:

Elastic Modulus Values  
--- a ratio of stress to strain under load.
145 psi  (1 MPa) to 58 000 000 psi (400 000) MPa

Topics   Index

**************************************
Copyright 2002 by Roger D. Corneliussen
**************************************

Values are from Modern Plastics Encyclopedia 99.

Value Ranges
If you want to go to a specific range, simply click the appropriate range below.

1 to 10 MPa /145 to 1450 psi

10 TO 1000 MPa /1450 to 145 000 psi

1000 to 2000 MPa /145 000 to 290 000 psi

2000 to 3000 MPa /290 000 to 435 000 psi

3000 to 4000 MPa /435 000 to 580 000 psi

4000 to 5000 MPa /580 000 to 725 000 psi

5000 to 6000 MPa /725 000 to 870 000 psi

6000 to 7000 MPa /870 000 to 1 015 000 psi

7000 to 8000 MPa /1 015 000 to 1 160 000 psi

8000 to 9000 MPa /1 160 000 to 1 305 000 psi

9000 to 10 000 MPa /1 305 000 to 1 450 000 psi

10 000 to 20 000 MPa /1 450 000 to 2 900 000 psi

20 000 to 30 000 MPa /2 900 000 to 4 350 000 psi

30 000 to 40 000 MPa /4 350 000 to 5 800 000 psi

40 000 to 50 000 MPa /5 800 000 to 7 250 000 psi

50 000 to 60 000 MPa /7 250 000 to 8 700 000 psi

60 000 to 70 000 MPa /8 700 000 to 10 200 000 psi

70 000 to 80 000 MPa /10 200 000 to 11 600 000 psi

80 000 to 90 000 MPa /11 600 000 to 13 050 000 psi

90 000 to 100 000 MPa /13 050 000 to 14 500 000 psi

100 000 to 110 000 MPa /14 500 000 to 16 000 000 psi

110 000 to 120 000 MPa /16 000 000 to 17 400 000 psi

140 000 to 150 000 MPa /20 300 000 to 22 000 000 psi

180 000 to 190 000 MPa /26 100 000 to 27 550 000 psi

200 000 to 210 000 MPa /29 000 000 to 30 450 000 psi

350 000 to 400 000 MPa /50 750 000 to 58 000 000 psi

Value Ranges

Units

Pascals (Pa) kg/m2 (newton per square meter)
    = 1 000 000 x MPa

Megapascals (MPa)
    = 0.000 001 x Pa
    = 0.006894 x psi
    = 0.1013 x atm

kilopascals (kPa)
    = 1000 MPa

pound-force per square inch (psi)
    = 145.04 x MPa

1000 x pound-force per square inch (ksi)
    = 0.001 x psi

Atmosphere (atm)
    = 9.689 x MPa

bar
    = 10 MPa

Millibar
    = 1000 bar
    = 10 000 MPa

kilogram force per square centimeter (kg/cm2)
    = 10.197 x MPa

Torr
    = 7.500 KPa
    = 0.0075 MPa

gram force per square centimeter (gm/cm2)
    = 10.194 x kPa
    = 10194 x MPa

Values

1 to 10 MPa
145 to 1450 psi
    Synthetic Rubber
        4 to 75 MPa
        600 to 11 000 psi
    Polyolefin Thermoplastic Elastomer*
        7 t0 110 MPa
        1000 to 16 000 psi
Value Ranges

Units

Values

10 to 1000 MPa
1450 to 145 000 psi
      Ethylene Vinyl Acetate Copolymer*
        48 to 200 MPa
        7000 to 29 000 psi
    Polyurethane Thermoset Casting Resin*
        70 to 700 MPa
        10 000 to 100 000 psi
    Low Density Polyethylene (LDPE)*
        170 to 280 MPa
        25 000 to 41 000 psi
     Fluorinated Ethylene Propylene*
        350 MPa
        50 000 psi
    Polyvinylidene Chloride (PVDC)*
        340 to 550 MPa
        50 000 to 80 000 psi
    Cellulose Acetate Butyrate
        Molding and Extrusion Compound*
       350 to 1400 MPa
       50 000 to 200 000 psi
    Cellulose Acetate Propionate
         Molding and Extrusion Compound*
        400 to 1500 MPa
        60 000 to 215 000 psi
    High Density Polyethylene (HDPE)*
        1100 MPa
        155 000 to 158 000 psi
    Polytetrafluoroethylene (PTFE)*
        400 to 550 MPa
        58 000 to 80 000 psi
    ABS Extrusion Grade*
        400 to 1300 MPa
        130 000 to 420 000 psi

Value Ranges

Units

Values

1000 to 2000 MPa
145 000 to 290 000 psi
    Polymethylpentene*
        1100 to 1900 MPa
        160 000 to 280 000
    High Impact Polystyrene (HIPS)*
        1100 to 2600 MPa
        160 000 to 370 000 psi
    Polypropylene*
        1100 to 1600 MPa
        165 000 to 225 000 psi
    Cellulose Nitrate*
        1300 to 1500 psi
        190 000 to 220 000 psi
    Polyamides Nylon 66*
        1600 to 3800 MPa
        230 000 to 550 000 psi
    Acetal Homopolymer*
        1200 to 1600 MPa
       400 000 to 520 000 psi

Value Ranges

Units

Values

2000 to 3000 MPa
290 000 to 435 000 psi
     Toughened Nylon 6*
         2000 MPa as molded
        700 MPa conditioned in 50% relative humidity
         290 000 psi as molded
        102 000 psi conditioned in 50% relative humidity
     Polyvinyl Fluoride Film *
        2070 to 2600 MPa
        300 000 to 380 000 psi
   Allyl Diglycol Carbonate Cast Sheet
        2070 MPa
        300 000 psi
    Polyimide, Thermoplastic*
        2070 to 2800 MPa
        300 000 to 400 000 psi
    Acrylics, Cast Sheet *
        2100 to 21 000 MPa
        310 000 to 3 100 000 psi
    Polyphenylene Oxide (PPO)(PPE)
        modified with polystyrene*
        2100 to 2600 MPa
        310 000 to 380 000 psi
    Chlorinated PVC (CPVC)*
        2200 to 3300 MPa
        326 000 to 475 000 psi
    Polystyrene (PS)*
        2300 to 3300 MPa
        330 000 to 475 000 psi)
    Epoxy Casting Resin *
        2400 MPa
        350 000 psi
    Polyvinyl Chloride (PVC) Rigid*
        2400 to 4100 MPa
        350 000 to 600 000 psi
    Acetal Copolymer *
        2600 to 3200 MPa
        377 000 to 464 000 psi
    Polyethersulfone*
        2700 MPa
        385 000 psi
    Polyester (PET)
        2800 to 4100 MPa
        400 000 to 600 000 psi
    Phenolic Unfilled*
        2800 to 4800 MPa
        400 000 to 700 000 psi
    Vulcanized Rubber**
        2800 MPa
        400 000 psi)
    Polyetherimide*
        3000 MPa
        430 000 psi

Value Ranges

Units

Values

3000 to 4000 MPa
435 000 to 580 000
    Styrene-Acrylonitrile Copolymer (SAN)*
        3300 to 3900 MPa
        475 000 to 560 000 psi
    Polyphenylene Sulfide (PPS)*
        3300 MPa
        480 000 psi
    Polyamide Nylon 6 Cast*
        3300 to 3800 MPa
        485 000 to 550 000 psi
    Polyacrylonitrile (PAN) Extrusion Grade*
        3500 to 3800 MPa
        500 000 to 550 000 psi
    Polyaryletherketone*
        3600 to 4000 MPa
        520 000 to 580 000 psi
    Polyketone*
        3600 MPa
        520 000 psi

4000 to 5000 MPa
580 000 to 725 000 psi

Value Ranges

Units

Values

5000 to 6000 MPa
725 000 to 870 000 psi

Value Ranges

Units

Values

6000 to 7000 MPa
870 000 to 1 015 000 psi

Value Ranges

Units

Values

7000 to 8000 MPa
1 015 000 to 1 160 000 psi
    Graphite**
        7 000 MPa
        1 000 000 psi

Value Ranges

Units

Values

8000 to 9000 MPa
1 160 000  to 1 305 000 psi
    Phenolic Glass Filled*
        8 800 MPa
        1 280 000 psi

Value Ranges

Units

Values

9000 to 10000 MPa
1 305 000 to 1 450 000 psi

Value Ranges

Units

Values

10 000 to 20 000 MPa
1 450 000 to 2 900 000 psi
    Liquid Crystal Polymer*
        10 000 to 19 000 MPa
        1 400 000 to 2 800 000 psi
    Polyetheretherketone (PEEK)
    30% Carbon Fiber Reinforced*
        13 000 to 24 000 MPa
        1 860 000 to  3 500 000 psi
    Epoxy /Glass Fiber Reinforced
    Sheet Molding Compound *
        14 000 to 28 000 MPa
        2 000 000 to 4 000 000 psi
    Concrete
        14 000 MPA
        2 000 000 psi
    Lead **
        14 000 MPa
        2 000 000 psi
    Liquid Crystal Polymer
    45% Glass Fiber Reinforced*
        15 000 MPa
        2 170 000 psi
    Phenolic PAN Carbon Filled*
        17 000 MPa
        2 490 000 psi

Value Ranges

Units

Values

20 000 to 30 000 MPa
2 900 000 to 4 350 000 psi

Value Ranges

Units

Values

30 000 to 40 000 MPa
4 350 000 to 5 800 000 psi
    Liquid Crystal Polymer
    30% Carbon Fiber Reinforced*
        37 000 MPa
        5 400 000 psi

Value Ranges

Units

Values

40 000 to 50 000 MPa
5 800 000 to 7 250 000 psi
    Magnesium ***
        45 000 MPa
        6 500 000 psi

Value Ranges

Units

Values

50 000 to 60 000 MPa
7 250 000 to 8 700 000 psi

Value Ranges

Units

Values

60 000 to 70 000 MPa
8 700 000 to 10 200 000 psi
    Epoxy Carbon Fiber
    Reinforced Sheet Molding Compound*
        70 000 MPa
        10 000 000 psi

Value Ranges

Units

Values

70 000 to 80 000 MPa
10 200 000 to 11 600 000 psi
    Aluminum (99.9 +)**
        70 000 MPa
        10 000 000 psi
    Aluminum Alloys**
        70 000 MPa
        10 000 000 psi
    Glass ***
        70 000 MPa
        10 000 000 psi
    Silver (Sterling)**
        75 000 MPa
        11 000 000 psi

Value Ranges

Units

Values

80 000 to 90 000 MPa
11 600 000 to 13 050 000 psi

Value Ranges

Units

Values

90 000 to 100 000 MPa
13 050 000 14 500 000 psi

Value Ranges

Units

Values

100 000 to 110 000 MPa
14 500 000 to 16 000 000 psi

Value Ranges

Units

Values

110 000 to 120 000 MPa
16 000 000 to 17 400 000 psi
    Brass (70 Cu-20 Zn)**
        110 000 MPa
        16 000 000 psi
    Bronze (95 Cu-5 Sn)**
        110 000 MPa
        16 000 000 psi
    Copper **
        110 000 MPa
        16 000 000 psi

Value Ranges

Units

Values

140 000 to 150 000 MPa
20 300 000 to 22 000 000 psi
    Cast iron (gray)**
        140 000 MPa
        20 000 000 psi

Value Ranges

Units

Values

180 000 to 190 000 MPa
26 100 000 to 27 550 000 psi
    Monel (70 Ni - 30 Cu)
        180 000 MPa
        26 000 000 psi

Value Ranges

Units

Values

200 000 to 210 000 MPa
29 000 000 to 30 450 000 psi
    Iron (white)**
        205 000 MPa
        30 000 000 psi
    Cast Iron (white)**
        205 000 MPa
        30 000 000 psi
    Steel**
        205 000 MPa
        30 000 000 psi
    Magnesium Oxide **
        205 000 MPa
        30 000 000 psi

Value Ranges

Units

Values

350 000 to 400 000 MPa
50 750 000 to 58 000 000 psi
    Aluminum Oxide**
        350 000 MPa
        50 000 000 psi
    Titanium Carbide **
        350 000 MPa
        50 000 000 psi

Value Ranges

Units

Values

* Modern Plastics Encyclopedia 1999, p B158 to B216.(Tensile Modulus)
** Van Vlack, L.H., Materials for Engineering, Addison-Wesley Publishing Company, Reading, MA (1982) p. 588

Re: High Density Polyethylene (HDPE)

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mail2 wrote:

Properties 

High Density Polyethylene (HDPE)

Melt Flow ASTM D1238 (gm/10 min)
5 to 18 gm /10 min

Melting Temperature  degrees C
Tm Crystalline
130 to 137 C

Glass Transition (C)
Tg (Amorphous)
--- C

Processing Temperature Range Degrees F
Extrusion
350 to 500 F for injection molding
350 to 525 F for extrusion

Molding Pressure Range ( PSI) (ksi)
12 000 to 15 000 psi
12 to 15 ksi

Compression Ratio
2

Mold(Linear) Shrinkage (in/in)
ASTM D955
0.015 to 0.040

Tensile Strength at Break
ASTM D638
3200 to 4500 psi

Elongation at break (%)
ASTM D638
10 to 1200 %

Tensile Yield Strength (psi)
ASTM D638
3800 to 4800 psi

Compressive Strength (psi)
Rupture or Yield
ASTM D695
2700 to 3600  psi

Flexural Strength (psi)
Rupture or Yield
ASTM D790
---  psi

 Tensile Modulus (psi)
ASTM D638
155 000 to 158 000 psi

To go to Modulus Values,
click on
Modulus ( xem entry truoc )

Compressive Modulus (psi)
ASTM D695
--- psi

To go to Modulus Values,
click on
Modulus ( xem entry truoc )

Flexural Modulus (psi)
ASTM D790
At 73 F
145 000 to 225 000 psi

To go to Modulus Values,
click on
Modulus ( xem entry truoc )

Izod Impact (ft-lb/in of notch)
ASTM D256A
0.4 to 4.0 ft lb/in of notch

Hardness
Rockwell ASTM D785
---
Shore D66 ASTM D2240/D2583
73

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
59 to 110 (10 x exp –6) in/in /C
0.000 059 to 0.000 110 in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
--- F
66 psi  ---
175 to 196 F

Thermal Conductivity
(10 x exp –4)al cm/sec cm2 C
ASTM C177
11 to 12 (10 x exp –4) cal cm/sec cm2
0.0011 to 0.0012 cal cm/sec cm2

Specific Gravity
ASTM D792
0.952 to 0.965

To go to Density /Specific Gravity Values,
click on
Density ( 30 USD mới coi tiếp được nha)

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- less than 0.01%
Saturation --- %

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
450 to 500 v/mil

Tính chất của nhựa PP

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PP Detailed Properties

(Polypropylene)

Polypropylene is available in several grades and  types.  The table below lists a generally accepted summary of properties that we believe to be reliable, however, for specific information on a particular grade, please contact us.   Determination of resin is dependent on the application and this table is only meant to serve as a general guideline.

PP Properties	ASTM	UNIT	PP
MECHANICAL PROPERTIES
Specific Gravity	D792		0.905
Elongation	D638	%	10~20
Tensile Strength	D638	psi	4,800
Flexural Strength	D790	psi	5,400
Compressive Strength	D695		6,000
Tensile Elastic Modulas  (Young's Modulas)	D638	(10~5)psi	1.6
Flexural Modulas	D790	(10~5)psi	1.7~2.5
Hardness Durometer	D785	Rockwell R	80~110
Impact Strength IZOD 73°F/23°C	D256	notched ft/lbs/in	0.5~2.2
THERMAL PROPERTIES
Melting Point		°C (°F)	121 (250)
Upper Service Temperature(20,000h)		°C (°F)	104 (220)
Flame Rating**		UL94	n.r.
Thermal Conductivity	C117	10~4 cal/sec/cm2,ºC/cm	2.8
ELECTRICAL PROPERTIES
Dielectric Constant	D150	1kHz	2.2~2.6
Dissipation Factor	D150	1kHz	0.0005~0.0018
Dielectric Strength	D149	125 v/mil.	475~660
Volume Resistivity	D257	ohm-cm at 73ºF, 50% RH	10~17
GENERAL PROPERTIES
Chemical/Solvent Resistance			Excellent
Water Absorption, 24h	D570	%	<0.03
Refractive Index
Arc Resistivity	D495	sec	100~160

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