Quid sunt classes spongiae?

In life, we will come into contact with a lot of packaging sponge lining, so we are no stranger to sponge, the use of sponge has been applied to people's life field, sponge can be used in product packaging, widely used in IT, electronic appliances, hardware and electromechanical, glass products, precision spectrograph and other products packaging.

Packaging spongia products sunt flexibile, lightweight, bonum density, dives et elastica, et potest esse ut cushioning materiae ut productum potest melius discere ex et anti-frictionem productum, et potest etiam in effectu shockproof et anti-frictio. In eodem tempore, in packaging spongia habet seriem superior servitium characteres ut calor conservationem, humorem resistentia et corrosio resistentia. Sed scis prorsus quam spongiae sunt classificatis?

Quid genus communis spongia:
I. Generalis spongia (ex XV relative densitas ad L relative densitas)
II. Flamma retardant spongia (alba, nigrum griseo, tenebris griseo, tenebris hyacintho et aliis relativis densitas exempla et cubits)
III. Obligaverunt spongiam (durum, durum et variis compressive viribus)
IV. High densitas spongia (28d, 30D, 33D, 40d, etc.)