Limiting oxygen index test

The limiting oxygen index (LOI) value of unmodified epoxy was increased from 19 to 25 by the incorporation of siloxane and PBMI into the epoxy resin. The enhancement in LOI values was more probably related to the char enrichment of phosphorus and the char protecting effect of siloxane moiety [38-41] to exhibit their synergistic effect towards enhanced flame retardancy. 

---

In this section, flammability of the electrolyte is discussed. The flammability is determined by using several methods, i.e., burning test with UL94HB method, flash point test with ASTM D56 and ASTM D93 method, and limiting oxygen index test with JIS K 7,201 method. These test procedures sometimes are arranged with these requirements. 

With regard to flammability as measured in the LOI test (25) (see section on The Limiting Oxygen Index Test), if Equation 52 applies and Aflame= LOI, then equation 74 gives the criterion for flame extinction... 

Fig. 27. The limiting oxygen index test. Photo Courtesy of Fire Testing Technology 2004.

It has been found that magnesium hydroxide appears to have a special synergy with polyethylene vinyl acetate [119], resulting in high levels of flame retardancy as measured by the limiting oxygen index tests (LOI) [120]. The effect of the magnesium hydroxide on the LOI of a polyethylene vinyl acetate (18% of vinyl acetate content) is presented in Table 3.3.1. 

The Limiting Oxygen Index Test. The LOI test is a typical example of a method that is used to control the production of materials, products, and assemblies and in research to develop new products. This test is standardized in North America as ASTM D2863, Standard Test Method for Measuring the Minimum... 

---