What are the standard substance weights for envelopes ?
16 lb. Used for overseas air mail envelopes. ” 20 lb. Used for commercial envelopes where strength and opacity is not a factor. ” 24 lb. Used for most open side official and commercial envelopes. ” 28 lb. Used for most open and catalog envelopes and large (i.e. 11, 12 and 14) size commercial envelopes. ” 32 lb. Used for heavy duty envelopes and clasp envelopes. ” 40 lb.
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