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Such moldings require precision molds, fewer cavities per mold, close mix controls, M1 Precision etc. Optical comparators or other measuring devices may be required to minimize distortion of the rubber part by the measuring instrument. This part requires expensive control and inspection procedures. M2 High Quality These moldings involve much of the close controls required for the above class. Molds must be precision machined and kept in good repair.
While measurement methods may be simpler than the above class, careful inspection will usually M3 M4 Non-critical This class indicates a general grade or commercial product. This is the most commonly used class. Molds by this class apply to products were control is noncritical and secondary to cost. Based on the class selected, use the corresponding table below to apply tolerances as follows: 1.
Fixed tolerances are related by size to each dimension but all closure tolerances are determined by the largest closure dimension. Tolerances not shown should be determined in consultation with the manufacturer. Take special care when applying standard tolerances to products having wide sectional variations.
SS-ISO 3302-1 E and L class.pdf - National Gummi
DIN ISO 3302-1