What is the limiting oxygen index LOI of PVC?

A material with a LOI value above 21 (air contains 21\% oxygen) should not burn in air at room temperature, and a value above 25-27 means that the material will only burn under conditions of very high applied heat. Rigid PVC has an oxygen index of 45-50, compared to 21-22 for wood and 17-18 for most thermoplastics.

What is Loi in textile?

Limiting Oxygen Index (LOI) is the parameter most frequently used to characterize the improvements in fire retardancy of protective fabrics. LOI indicates the minimum oxygen concentration in the test atmosphere to support ignition and flaming combustion of the material.

What is oxygen index in India?

Product Description. Oxygen Index Apparatus is defined as minimum concentration of oxygen, expressed as volume percent in a mixture of oxygen and nitrogen that just support flaming combustion of plastic materials under equilibrium condition of candle like burning.

What is limiting oxygen index test?

Limiting oxygen index (LOI) is the measure of the minimum percentage of oxygen in an oxygen/nitrogen mixture that is required to support the combustion of plastics.

How do you calculate limiting oxygen index?

The limiting oxygen index (LOI) is the minimum concentration of oxygen, expressed as a percentage, that will support combustion of a polymer. It is measured by passing a mixture of oxygen and nitrogen over a burning specimen, and reducing the oxygen level until a critical level is reached.

What is the minimum oxygen percentage?

The minimum oxygen concentration in the air required for human breathing is 19.5 percent.

How do you find the limiting oxygen concentration?

The limiting oxygen concentration (LOC), also known as the minimum oxygen concentration (MOC), is defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel….Limiting oxygen concentration.

What is the oxygen index test?

Scope: ASTM D2863 is a method to determine the minimum concentration of oxygen in an oxygen/nitrogen mixture that will support a flaming burn in a plastic specimen.

What is the normal oxygen index?

Oxygenation index (OI) is routinely used as an indicator of severity of HRF in neonates, with an arbitrary cutoff of 15 or less for mild HRF, between 16 and 25 for moderate HRF, between 26 and 40 for severe HRF, and more than 40 for very severe HRF.

What is the normal range for oxygen index?

Normal: A normal ABG oxygen level for healthy lungs falls between 80 and 100 millimeters of mercury (mm Hg). If a pulse ox measured your blood oxygen level (SpO2), a normal reading is typically between 95 and 100 percent. However, in COPD or other lung diseases, these ranges may not apply.

How do you calculate oxygen index?

Oxygenation index is calculated as OI = MAP × Fio2 × 100 / Pao2, where MAP indicates mean airway pressure and Fio2 indicates fraction of inspired oxygen.

What is limiting oxygen index (LOI) test?

The purpose of the Limiting Oxygen Index (LOI) test, sometimes referred to as Oxygen Index (OI) or Critical Oxygen index (COI), is to measure the relative flammability of plastics and composite materials by burning them in a controlled atmosphere consisting of a mixture of oxygen and nitrogen.

What is the index of oxygen in composites?

Composites containing aromatic polymers have high index values, including phenolic, high-temperature thermoset and many thermoplastic matrix laminates. 40,42–44 Limiting oxygen index (LOI) is the measure of the minimum percentage of oxygen in an oxygen/nitrogen mixture that is required to support the combustion of plastics.

What are the Loi test standards for burning plastics?

LOI test standards include ASTM D2863-10 Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index) and ISO 4589-2:1996 Plastics—Determination of burning behavior by oxygen index—Part 2: Ambient-temperature test. A schematic of the test equipment is shown in Fig. 2.28.

What is the limiting oxygen index of a flame?

The Limiting Oxygen Index represents the minimum level of oxygen in the atmosphere that can sustain flame on a thermoplastic material. The higher the hydrogen to carbon ratio in the polymer, the greater is the tendency to burning (other factors being equal).