According to our conversation over the phone, followed standard of corrosion test referenced a test specimen 25 by 50 mm (1 by 2 in.) is recommended as a standard size and the proportion of end-grain surface to specimen surface should be kept as small as possible given the limitations of specimen sizes.
After the preparation according to standard. The next step is to take the test piece weighed. When weighed us found that the weights of the test piece exceeds the range of the scale (weighing scale have capacity range 0~310g.). It might have to reduce the size of the specimen. Please consider that we can reduce the size of the specimen thickness or width of the material or not.