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SarahRossetti

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Industry info Wiki Q&A

Q polyethylene molecule structure

SarahRossetti

VivienDelia Release Time: May 29, 2024, 7:16 AM

Polyethylene, the most common plastic, is a polymer consisting of long chains of the monomer ethylene (CH2=CH2). Its molecular structure involves carbon atoms bonded to other carbons and to hydrogen atoms, forming a zigzag pattern. Depending on the crystallinity and molecular weight, polyethylene can vary from a hard and rigid material to a flexible and elastic one. There are various types, including HDPE (high-density polyethylene) and LDPE (low-density polyethylene), which differ in branching and density. The properties of polyethylene, such as resistance to moisture and chemicals, make it widely used in packaging, containers, and insulation. The production method, either high pressure leading to LDPE or low pressure leading to HDPE, significantly affects its structure and uses.

Q what is iso vg 220 oil grade

SarahRossetti

WandaPound Release Time: April 20, 2024, 3:12 PM

ISO VG 220 refers to a specific grade of industrial lubricant classified by the International Organization for Standardization’s viscosity grading (VG) system. The “220” numeral denotes the oil’s mid-point kinematic viscosity in centistokes (cSt) measured at 40°C. Oils in this category typically have viscosity values ranging between 198 cSt and 242 cSt. ISO VG 220 oils are often used in gearboxes, compressors, and hydraulic systems where a higher viscosity is needed to ensure proper lubrication and protection against wear and tear under higher temperatures or loads. They are especially beneficial in applications where precise viscosity is crucial for equipment performance and longevity.

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