PMMA LDPE HDPE
LDPE is softest, HDPE is harder, PMMA is much harder than HDPE
In increasing order, LDPE has the lowest melting point at 221 to 239 degrees Fahrenheit. It is followed by HDPE at 266 degrees Fahrenheit and PPMA at 320 degrees Fahrenheit.
enthalpy LDPE
LDPE is Low Density PolyEthylene.HDPE is High Density PolyEthylene.
LDPE , HDPE, LLDPE
LDPE (Low-Density Polyethylene) has more branching in its molecular structure than HDPE (High-Density Polyethylene), giving it a lower density and flexibility. HDPE is more rigid and has a higher tensile strength compared to LDPE. LDPE is commonly used for packaging and bags, while HDPE is often used for bottles and containers.
LDPE , HDPE, LLDPE
Because LDPE is an abbreviation of Low Density Poly Ethylene, whereas HDPE stands for High Density Poly Ethylene. This means LDPE is less efficiently packed together than HDPE, due to the larger amount of branching found in LDPE, leading to a weaker material.
HDPE has higher density therefore it has greater tensile strength
Usually with a 'rubberizing' additive that contains LLDPE (Linear low density polyethylene) More branches and better bonding, less amorphous. Greater tensile and impact strength than LDPE or HDPE.
Technically, adequately made LDPE and HDPE bags/containers are safe for food storage and consumption. Recycled materials and unsafe additives/colors, etc. must not be added.For instance, LDPE bags are more transparent in nature than HDPE, so it ideal for clear zip-lock sandwich bags. HDPE is tougher and opaquer (UV protection of sensitive foods), so used for milk bottles. Consider factors like barrier, toughness, seal ability before making your purchase.
They can be made from several different things: Butene Copolymer Copolymer - HDPE (High Density Polyethylene) Ethylene Vinyl Acetate HDPE - Reclaim LLDPE (Linear Low Density Polyethylene) -Hexene Copolymer Homopolymer - HDPE Homopolymer - LDPE (Low Density Polyethylene) Homopolymer - PP (Polypropylene) PP-IM (Impact) LDPE-Reclaim LLDPE-OC (Octene Copolymer) LDPE Copolymer For more information go to http://www.townsendpolymer.com