What is HMW HDPE?
High Molecular Weight (HMW) High Density Polyethylene (HDPE) resins with very low melt indices (MI2 ranging from 0.03 to 0.1 dg/min) and very broad, multi-modal molecular weight distributions provide high melt strength and excellent impact properties.
What are the properties of HDPE?
It has the following properties: Stiffness, strength, toughness, resistance to chemicals and moisture, permeability to gas, ease of processing, and ease of forming. The recycling symbol for this plastic is seen opposite. Look at the HDPE folding chair seen on the previous page.
What is the tensile strength of HDPE?
HDPE (High Density Polyethylene) Typical Properties
| Physical Properties | English | |
|---|---|---|
| Hardness, Shore D | 58 – 65 | 62 |
| Tensile Strength, Ultimate | 3480 – 6530 psi | 30 MPa |
| Tensile Strength, Yield | 2180 – 4350 psi | 21.9 MPa |
| Elongation at Break | 500 – 1000 % | 840% |
How do you increase tensile strength of HDPE?
The addition of 25% mass of HDPE to LDPE polymer increases the tensile strength by 121% to 17 MPa.
What are the grades of HDPE?
Normally available in two grades. 300 grade and 500 grade. the higher number denotes the density of the material and can improve on performance. The majority of HDPE is available in either black or white although 500 grade sheet is available in a range of colors.
What is high molecular weight?
Definition. means a polymer that has a number average molecular weight that is greater than or equal to 1,000 g/mol.
At what temperature does HDPE soften?
80-120°C
Polyethylene is a thermoplastic polymer of ethylene. This plastic, the most popular in the world, is a white waxy mass, chemically resistant, cold-resistant, with insulating and shock-absorbing properties, that softens when heated (at 80-120°C), solidifies when cooled and has low adhesion.
Is HDPE ductile or brittle?
In HDPE pressure pipe applications, brittle failure is the most common mode of failure; it is characterized by the slow and steady growth of a crack that is initiated at a defect or stress concentration in the pipe.
Why does HDPE have high tensile strength?
HDPE shows higher stiffness and ultimate tensile strength at low temperatures due to lower chain mobility than at elevated temperatures. At elevated temperatures, the molecules are more flexible and can deform in the direction in which stress is applied.
How many types of HDPE are there?
Types of HDPE Pipes
PE 63 – medium pressure piping systems. PE 80 – gas pipe for natural gas distribution network with pressure rate up to 4 bars or drinking water pipe with pressure rate up to 16 bar – sewers, outfall pipes, industrial pipes. PE 100 – high demands piping applications.
Which is better PE80 and PE100?
Results show that PE100 is better than PE80 in crack growth resistance, according to PENT test results (Ref 3), and has higher yield strength and elastic modulus (Ref 4).
What are HMW species?
HMW species include dimers, trimers, tetramers, etc., formed of monomers that can be either covalently or non-covalently linked, according to John Moscariello, vice-president of process development for CMC Biologics.
What is molecular weight range?
Most of the practically useful polymers have a DP between 200 to 2000, corresponding to a molecular weight range from 20,000 to 200,000.
What dissolves HDPE?
Benzene,toluene , trichlorobenzene, trichloroethylene, tetralin, xylene are the suitable solvents for HDPE and LDPE. But toluene, xylene,trichloroetthylene are the less hazardous and most preferred solvents .
What are the disadvantages of HDPE?
The Disadvantages of HDPE Include
- Poor Weathering.
- Highly Flammable.
- Sensitive to Stress Cracking.
- Not Biodegradable.
- Can’t Be Composted.
- Not Resistant to Oxidizing Acids.
- Not Resistant to Chlorinated Hydrocarbons.
- High Thermal Expansion.
What makes HDPE brittle?
If you do not have stabilizers, then PE is vulnerable to sulphur+ozone combination. It will cross-link gradually and become brittle. Sulphur comes from tires and ozone is a normal component of air in large city.
Why tensile strength HDPE is higher than LDPE?
However, HDPE has quite a high grade of strength over LDPE. This is due to its structural composition. HDPE has a rigid structure with very less branching. This gives it more tensile strength and has stronger intermolecular forces.
What is pn16 HDPE pipe?
HDPE pipe is a type of flexible plastic pipe used for fluid and gas transfer and is often used to replace ageing concrete or steel mains pipelines.
What is PN10 pressure rating?
PN stands for Nominal Pressure and roughly equates to the number of bar i.e. the cold working pressure of PN10 is 10 bar.
What is PE 80 in HDPE pipe?
PE80 has been widely used for gas, water and industrial applications for many years and is most commonly named MDPE (Medium Density Polyethylene). However, PE80 could also be HDPE (High Density Polyethylene). PE80 pipes are often rated SDR11 PN12 and have a minimum required strength (MRS) of 8.0MPa (Megapascal).
What are low molecular weight species?
Low molecular weight (LMW) species (e.g. protein backbone-truncated fragments) and high molecular weight (HMW) species (e.g. antibody dimer species) are both examples of product-related impurities that contribute to the size heterogeneity of mAb products.
What is the most frequently used type of chromatography for capturing monoclonal antibodies?
Protein A chromatography is the most frequently used affinity chromatography method in biomanufacturing. It is the standard technique for capturing recombinant monoclonal antibodies, which relies on the reversible and specific binding between the immobilized protein A ligand and antibodies.
What is the molecular weight of HDPE?
100,000 – 250,000
High Density Polyethylene (HDPE)
It typically displays a molecular weight in the region of 100,000 – 250,000 and is renowned for its exceptional strength-to-density ratios. HDPE is routinely used to fabricate plastic bags and bottles, toys, and pipe systems.
What is the range for high molecular weight?
means a polymer that has a number average molecular weight that is greater than or equal to 1,000 g/mol.
Will acetone melt HDPE?
While acetone will not dissolve HDPE, it can lead to material failure. If you leave acetone in a Nalgene bottle for long periods, it will eventually develop horizontal (i.e. circumferential) solvent-stress cracks at the level of the liquid-vapor interface, leading to failure when squeezed.