little paper on purity vs Led quality and some pricing for 5N alumina.
interesting...

http://www.jingruinano.com/en/display.asp?id=219

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It’s well known that impurities of 5N high purity alumina for growing LED sapphire wafer must be controlled in the range (Fe <6ppm,Si<5ppm,Zr <1ppm,Cu <1ppm,K <1ppm,Na <1ppm).Actually, the method is well controlled impurity content .Presently, Sumitomo,in Japan, produces the largest quantity of 5N (99.999%)alumina with the way. Their capacity is 1000Tons per year and price is 450-500 per kilogram. Their product is popular worldwide owing to high purity and quality. In China, xuan cheng jing rui new material co.,ltd,Hang Zhou wan jing new material co.,ltd adopt the advanced method since 1996 to produce high purity alumina. In the way, though the companies take a lot of detours and the purity is unqualified at first, they constantly make effort to explore technology and innovate. It takes nearly 6 years to resolve the purity, technique, equipment.Now their technology is rather mature, and own their independent intellectual property rights. Practice proves that their product of VK-L100G,VK-L100K can grow big and superior sapphire wafer.

Why 5N alumina is better than 4N (99.99%)in growing sapphire wafer? As we knows, alumina for sapphire wafer should be high—purity and bubble-free, bright in the process of growing wafers. Besides,the wafers must be lattice matching.Otherwise,the product can only be used as industrial jewel. So whether the wafers are in good quality depends on the purity of alumina. By experience, 4N (99.99%) alumina can’t grow sapphire wafers in high quality. Specific reasons are as follows:

1. The transparency of wafer is not white(always mix pink, yellow and so on) when some customers use 4N or 3N alumina powder to grow sapphire wafers. It is because too much impurities such as Fe, Si, Na, K, Ni can’t be got rid of.
2.Wafers are crystal and line defect, which will cause line defect of gallium arsenide when start epitaxial processing, subsequently, the lightening rate of the LED chips is only about 30%.On the other hand, the lightening rate of the LED chips is over 90% when the sapphire wafers grow from 5N high purity alumina.
3. In the view of profit, 1 kg crystalline bar grown from 5N high purity alumina can sell at $2380-$6349 per kilogram. While 1 kg crystalline bar grown from 4N high purity alumina can only sell at $65-$160 per kilogram.


Note point 3 about the pricing of 5N...


This piece of paper is coherent with RB quotes in a recent pr:

http://www.prnewswire.com/news-releases ... 14536.html

MONTREAL, Sept. 13, 2012 /PRNewswire/ -- Orbite Aluminae Inc. (TSX: ORT) (OTCQX: EORBF) ("Orbite" or the "Company"), a leading provider of clean technology and developer of breakthrough alternative solutions for the alumina production industry, today announced it will begin producing high-purity alumina (HPA) in the first quarter of 2013 at its plant in Cap-Chat Quebec.

Orbite is expected to be the only North American company producing a 5N (99.999%) purity level of alumina, which is a rapidly growing market driven by increasing demand for LED lighting and products – applications that already represent nearly half of the overall market for HPA. By 2015, LED usage is expected to account for about 60 percent of the total HPA market partially due to legislation mandating a shift from incandescent and CFL (compact florescent) to LED lighting.

"Global demand for high-purity alumina is quickly exceeding the available supply," said Richard Boudreault, President and CEO of Orbite Aluminae. "Orbite should help address this deficit, which is critical to a range of industries, and is well positioned to be a strategic alternative to the Asian producers who've largely dominated and controlled the market."

Boudreault noted that another key market factor is the quality of the metal. "As technological applications continue to develop and advance, they require alumina that has a higher rate of purity, which is why our laboratory is also working hard to develop a 6N (or 99.9999%) purity level before the Company's HPA commercial plant is in service. The HPA plant, expected in operation early next year, will also enable the production of Rare Earth Elements," he commented.

In addition to LED products, high-purity alumina is also used in the production of semiconductors, phosphor products (e.g. plasma screens), lithium-ion batteries, and automotive sensors. According to Orbite, these are all business segments with substantial growth opportunity lies as demand increases, especially in emerging markets.

PR Newswire (http://s.tt/1ng2P)


Could we see a 6N pr before long?
Regards
MC