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Silk Products

The facts you should know about silk filled duvet(2)

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How can we tell the Quality of the silk filled duvet?

For quality level 4 and 5, it is a deception of using faux silk, polyester or the other fiber as natural silk fiber to fill the duvet.To tell if the duvet is 100% natural silk fiber filled, there are methods as belows.

1,Combustion: Silk is protein fiber. When burning, Silk fibers curl away from the flame, burn slowly with some melting, may self-extinguish when the flame is removed, and smells like burned feathers. Burned silk leaves a brittle, crushable round black bead after burning.
We can tell if this is the faux silk or polyester filled duvet. There is no natural silk fiber filled, only polyester.
2,Dissolution:We can use common disinfectant contain HCLO(Hypochlorite acid).The combuston is the traditional method to tell if the fiber is natural silk.This method is a bit outdate compare to the improvement of fake products.In fact, the current fake silk fiber is mostly mixed with other natural fiber like  kapok fiber,not the polyester before. The fiber will burn almost same as natural silk,and after burn,there is no stiff and uncrushable round black bead  left like polyester.

As the natural silk fiber is natural animal protein.When we dip the natural fiber into the a transparent glass filled with disinfectant, the natural silk fiber will be dissolved into the liquid in one or two minutue. If there are residuals in the glass, the fiber is not 100% natural silk fiber.

Silk Products

The facts you should know about silk filled duvet(1)

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As the weather is getting cold, Supermarket is displaying silk filled duvet on the promotion counters, also the online shopping is beginning to promote silk filled duvet in a prominent position.

However, the price of a lot of silk filled duvet make the consumer confused,the products with similar or the same name, some only sold at 200 yuan or cheaper, but some is more expensive than 1,000 yuan.

Are these really silk filled duvet?

The investigation show many of the silk filled duvet labeled “100% silk” not really “silk”.According to National Standard, the duvet which contain at least 50% silk can be labeled as “silk filled duvet”. Many silk filled duvet sold in regular supermarket contain only 20%~30% silk, or even only 10% silk content.

Though most suppliers indicate their products are “100% long strand mulberry silk filled duvet”, but according to the investigation regarding the products on the market, the silk filled duvet at market can be divided into the several quality levels as the following.
1, Silk filled duvet filled with 100% mulberry silk,which come from Shuan Gong cocoon(Double house cocoon).  Shuan Gong cocoon is one cocoon made by two silkworms.This silk worms can not be used to make silk fabric,which is suitable to make the top grade silk filled duvet. The length of silk strand is more than 1000 meter, so the silk filled duvet is more durable.

2, Silk filled duvet filled with blend of mulberry silk and tussah or all tussah. The tussah is a kind of wild silk which is made by silkworm eating leaves of Castor or oak. Tussah is more stiff and a bit yellow. Commonly, the tussah need to be bleached or other chemical treatment.So the quality is not so good as mulberry silk.   As the mulberry silk is very expensive and limited, so most silk used in the duvet industry is tussah.

3, Silk filled duvet filled with blend of tussah and silk scraps,which is the cocoon scraps left after the spinning.The silk scraps was made into  silk pocket by machine. As the silk scrap is the low quality, the fiber is very short, which is only several meters long. So the silk duvet filled with this is not so durable, moreover the property of silk is not so good as mulberry silk filled duvet.
4, Silk filled duvet filled with tussah and other fiber,like Kapok,cotton or even polyester.
5, Silk filled duvet filled with polyester or other fiber with no silk at all