According to the causes,the surface defects can be divided into blister containing non-metallic inclusion,blister without non-metallic inclusion and “raindrop”,“gills”,“mountained”.
Bullae are rounded or irregularly shaped blisters containing serous or seropurulent fluid.They differ from vesicles only in size, being larger than 1 cm.
"blister beetle:any of various soft-bodied beetles of the family Meloidae, such as the cantharis, that secrete a substance capable of blistering the skin."
The causes of the front fog lamp shield blistering after surface treatment are studied by means of metalloscopy,scanning electronic microscope and energy spectrum analysis.
Different form of plastic scraps are accepted: Rejected parts, Regrind, lumps, film rolls, triming edges, blister packs, offcut, offgrade, prime pellets and Processing loss. 3.
The midgut gland cell differentiation occurs at Z2, There are 4 types of cells, i. e., embryonic cell (E-cell), fibrillar cell (F-cell), blister cell (B-cell) and resorptive cell(R-cell).