Momme(mm)=Density 19mm=19lbs 100 yards of silk
Momme (mm), is a unit traditionally used to measure the quality of silk fabrics. One momme = 4.340 grams per square meter; 8 momme is approximately 1 ounce per square yard or 35 grams per square meter.

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The Density of silk measured by momme. More threads = more durable and expensive.
25 momme = thread count 750 durable for 10 years +
22 momme = thread count 600 durable for 5-10 years
19 momme = thread count 450 durable for 3-5 years
16 momme = thread count 300 durable for 1-3 years

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Normally, the higher the momme weight, the more durable the weave, the more luxurious the fabric is, the more suitable it is for heavy-duty use, and the longer the shelf-life.
16 momme - lightweight and it’s better to be washed by hands
19 momme - durable and can be washed by wash machine
22 momme - heavier, more durable, more luxurious, washable by machine
25/30 momme - heaviest, most durable and can be saved forever, washable by machine
Generally, all silks can be washed and the heavier ones can be washed repeatedly. The heavier the silk, the more opaque it becomes. This can vary even between the same kind of silk. For example, lightweight Charmeuse is translucent when used in clothing, but 30 momme charmeuse is opaque. Therefore, it does not mean that you must always buy silk products with higher momme weight. For instance, it would be too heavy to put on 30 mm silk sleepwear for the night, but 16mm silk sleepwear is not that durable, though. In a word, it is a question of making proper choices according to your own needs.