How to distinguish between sweater material

How to distinguish between sweater material

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When we see a sweater

maybe is look like same

but how to distinguish between sweater material?

Different material of wool products

only need one tool (lighters)

generally can distinguish

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[ No.1 For cotton: 100% cotton ]

When the cotton yarn is burnting, will have a smell of burn paper, orange flame , blue smoke, yarn will not shrinkage and not melt, leaving the fire, still can continue to burn, there are a few gray powder, powder is soft and thin

[ No.2 For wool: 100% wool ]

When close the fire, the wool yarn will be promptly curl, dissolve slowly, orange flame, will have a smell of the burn the hair, luster of amorphous particles hin color piece, loose and coarse , hand grinding crushed immediately

[ No.3 For polyester ]

Close to the flame fusion first contraction after melting, smoking, combustion slowly ; yellow-white flame  left the flame can continue burning, sometimes will extinguish by itself ; special fragrant sweet smell ;Residue features: the hard black round bead

[ No.4 For Nylon ]

Close to the fire:collapsar;Contact with the flame:melting,smoking;Leave the flame: extinguish by itself ;amino smell ;Residue characteristics: hard pale brown transparent round bead.

[ No.5 For Acrylic ]

Close to the fire:collapsar;Contact with the flame:melting,smoking;Leave the flame:continue to burning, black smoke; spicy smell;Residue features: black irregular beads, fragile.