1. Application

This applies to the test method of green sand loss on ignition determination

2. Definition

Green sand loss on ignition is the loss of weight on ignition, including absorbed water, interlayer water, crystallization water, and substances that decompose on heating and combustion.

3. Instrument and apparatus

3.1 Balance

A balance of the precision of 0.01g is used.

3.2 Heater

An electric furnace capable of keeping temperature of about 950 degree C is used.

4. Testing procedure

4.1 Operation

A sample of 10g is taken from the sand removed of water by the method described in TJFS-201(Green sand moisture content test method). It is heated in the furnace and heated at about 950 degree C for about 60 minutes. After heating, it is cooled in a desiccator to room temperature and weighed. The operation is repeated until reaching a constant weight.

4.2 Calculating loss on ignition

Loss on ignition is calculated by the following equation.

\[L.O.I. = { ( W_1 - W_2 ) \over W_1 } \times 100 \]

where

\[ \left\{ \begin{array}{l} L.O.I. &= loss \ on \ ignition \ of \ green \ sand \ (％) \\ W_2 &= the \ weight \ of \ the \ sample \ after \ heating \ (g) \end{array} \right. \]

Note: Though the sample weight is designated to be 10g, some deviation is permissible.

5. Expression

Loss on ignition is expressed in %.

6. Record

The result is calculated to the second decimal place. Test is repeated two times or more and averaged using values within 5% deviation.
Note: This method was ruled based on the simplified method that is most commonly used in the appendix 6 of JIS Z 2601 (Test method of casting sand). This method is not applied to the determination of ignition loss in TJFS-210 (Green sand silica program test method).