Problems that should be paid attention to during fuel analysis
The oil sample should be carbonized at a low temperature for a certain period of time during the digestion process, and then the temperature is increased for boiling digestion. If the temperature is too high, the sample will spill and affect the result. To ensure sufficient digestion time to fully digest the sample, the digestive juice should be digested for 2 hours after it is transparent.
After the digestive solution is cooled in an ice bath, an excess of alkali solution is added. At this time, the acid-base solution is divided into two layers, and the operation is carefully performed before the distillation to prevent the two layers of the solution from being mixed out to release NH3 in advance, resulting in a low result. When distilling, after the distillation unit is connected, it should be heated immediately to prevent the absorption of boric acid in the condensation tube due to the cooling of the digestive solution. The absorption of NH3 should be affected by the condensation tube. When heating to near boiling, the heating rate should be slowed down to make the solution boil smoothly and prevent NH3. Too fast to escape, boric acid can not be absorbed and the test results are low.
The purpose of adding Nazs is to precipitate Hg, which is a toxic substance. Therefore, after the end of the experiment, the waste liquid cannot be poured into the sewer, but should be collected and treated.
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PU sandwich panel is short for Polyurethane sandwich panel.
PU sandwich panel is generally used in the outer layer of the roof of the building. PU sandwich panel has good heat insulation and sound insulation, and the polyurethane does not assist the fire, which is in line with the fire safety.
The features of PU sandwich panel:
1. Fire proof Rating
2. good in heat insulate
3. Low water absorption
4. Light in weight
5. Good anti-corrosion
6. Environment friendly
Description of PU sandwich panel:
Structure: Top is PPGI steel sheet, Core is PU board, Bottom is PPGI steel sheet.
The thickness of steel sheet: 0.3-0.8mm
The thickness of core: 50/75/100/150/200mm
Color: White, blue, red or according to your requirement
Destiny of EPS:40kg
Length: According to customer`s requirement
Effective width: roof and wall are 1000mm
Packing: Plastic packing and nude in the container or according to your requirement.
Payment term: T/T, L/C, Western Union
FAQ:
1. Are you a factory or trading company?
We are a professional factory.
2. How about the delivery time?
It`s depends on the quantity, usually, it`s 15-20 days after we get your deposit.
3. Can you do OEM?
Yes.
4. How can you make sure the quality?
Our products will be test before the shipping, and we will show you the test.
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Shijiazhuang Zhouming Steel Building Materials Co., Ltd. , http://www.zmsteels.com