Tungsten hexafluoride (WF6) is the A-level inorganic virulent, highly corrosive, strong irritant, if exposure to this product by careless may cause eye, skin and respiratory mucosa very serious burning. The US Occupational Safety and Health Administration regulations allow WF6 exposure limit of 0.2ppm. Workplace air fluoride hygiene standards (GB 16228-1996) provide the workshop air maximum allowable fluoride of 1.0mg / m3 (in fluorine). Health standard for tungsten in the workshop air (GB 16229-1996) provide workplace air tungsten maximum allowable of 6mg / m3. The following table is the relevant provisions of China's environmental standards.

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Tungsten hexafluoride (WF6) at different temperatures as a colorless, transparent bromine gas or liquid, the molecules have a symmetrical octahedron structure at room temperature. When it contact water it will quickly hydrolyzed and produce hydrogen fluoride and tungsten trioxide, so the tungsten hexafluoride has similar toxicity with HF in the air. Therefore, during the operation of tungsten hexafluoride the works should to wear chemical protection suits and wearing gas masks.
If during the operation the skin comes into contact with the tungsten hexafluoride should be stripped of contaminated clothing, rinse with running water. In the burning wound coated magnesium oxide ointment or glycerin dilute ammonia, and timely medical treatment. If eye contact with WF6 should immediately open the upper lower eyelid, with a large number of mobile water thoroughly washed after 15 minutes for medical treatment. If you are not careful inhalation, you should immediately from the scene to fresh air, if feel breathing difficulty should immediately oxygen therapy and go with medical treatment promptly and timely. If ingested, it will have to immediately mouthwash, drink milk or egg white, and timely medical treatment.

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Tungsten hexafluoride is a colorless gas or light yellow liquid. Solid tungsten hexafluoride is a deliquescent white crystal, smoke in the moist air. Its physical properties are as follows: chemical formula: WF6, molecular weight: 297.8, boiling point: 17.5 ℃, melting point: 2.3 ℃, relative density: 3.44, and it is soluble in most organic solvents, and react with hydrofluoric acid to generate H2. Its CAS registry number is 7783-82-6 CAS system.
It is a toxic gas, for humans and the environment has a certain impact. If it contact with moist air or hydrolyzed will emit toxic and corrosive hydrogen fluoride gas, such gas will cause eye, skin, and mucous membranes very serious injury. At the same time the gas is highly corrosive and can erode almost all metals, can rapidly corrode glass. For WF6 on-site emergency monitoring can use speed measuring tube method and particle-selective electrode method. And laboratory monitoring can use ion selective electrode method and membrane fluoride ion selective electrode method.

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The causes of tungsten points’ ablation of car distributor can be seen as follows:

3. Car engine working at a low speed during a long period. In case the car engine working at a low speed during a long period, the closure time of tungsten points will prolonged resulting from the decreased frequency of opening and closing, and lead to the increase of  self-induced electromotive force of the primary winding and the primary current, eventually tungsten points will ablate. To avoid these phenomenons, you should increase the tungsten points’ gap of distributor appropriately.

4. Bad capacitor work

Bad internal connection or bad connection between housing and ground will lead to bad capacitor work.
Checking way: using the way of disassembling capacitor to in contrast of high voltage electrical spark.

When you disconnect the power-off tungsten points, capacitor will absorb the surge voltage which is formed by the self-induced electromotive force of primary winding of the ignition coil to reduce spark discharge of tungsten points, and to avoid tungsten points being ablated, furthermore, improving the rate change of primary current, therefore, improving the high-pressure spark.


 

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The reasons of tungsten contacts ablation of car distributor as follows:

3. Car engine running at low speed for a long time. If the car engine running at low speed for a long time, it will make tungsten contacts closure time prolonged due to the decreasing frequency of opening and closing, resulting in self-induced electromotive force of the primary winding increased and the primary current will also increased, eventually causing tungsten contacts ablation. To avoid the aforementioned phenomenon, tungsten contacts gap of distributor should be appropriately increased.

4. Bad capacitor work

The reason of bad capacitor work is that bad connection between housing and ground or bad internal connection.
Check method: adopting the method of disassembling capacitor to compare high voltage electrical spark.

When power-off tungsten contacts is disconnected, capacitor will absorb the surge voltage which is formed by the self-induced electromotive force of primary winding of the ignition coil to reduce spark discharge of tungsten contacts, so tungsten contacts can avoid being ablated , but also improve the rate of change of primary current, thereby enhancing the high-pressure spark.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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The causes of tungsten points’ ablation of car distributor can be read as follows:

5. The bracket screw or tungsten points’ riveting of the distributor is loose. If tungsten points’ riveting of the distributor is loose, then the engine will break. When the engine operates at high speeds, the exhaust pipes of the engine will shoot. And the gap tungsten contacts will change intensely, sometimes small and sometimes large, which can result in low-voltage current that can not be cut off at some point, and ultimately leading to tungsten points’ ablation.

6. The surface of tungsten points offset or skew. If the surface of tungsten points offset or skew, then the resistance will increase. The primary current will decrease and high speed off the fire will occur when the generator working at high speed. Flashover distance will be shortened when test fire. The spark will flows through the points when the engine is operating, which will make the current centered, therefore, the temperature of the current flowing through the point will rise, bring about the result that tungsten points will ablate eventually. 


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
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The reasons of tungsten contacts ablation of car distributor shown as follows:

5. The riveting of tungsten contacts of the distributor is loose or the bracket screw is loose. If the riveting of tungsten contacts of the distributor is loose, then the engine will fracture. And the engine’s exhaust pipes will shoot when the engine running at high speeds. The gap change of tungsten contacts is intense when the engine running at high speeds, sometimes large and sometimes small, which can cause low-voltage current that can not be cut off at some point, leading tungsten contact ablation eventually.

6. Tungsten contacts’ surface offset or skew. If the tungsten contacts’ surface offset or skew, then, it will lead to the increase of resistance. When the generator running at high speed, the primary current will reduce, high speed off the fire will occur. When test fire, flashover distance will be shortened. When the engine is working, it is the points that spark through, it will make the current focused, so that the temperature of the current through the point will rise, eventually leading to tungsten contact ablation.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

The causes of tungsten points’ ablation of car distributor can be seen as follows:

3. Car engine working at a low speed during a long period. In case the car engine working at a low speed during a long period, the closure time of tungsten points will prolonged resulting from the decreased frequency of opening and closing, and lead to the increase of  self-induced electromotive force of the primary winding and the primary current, eventually tungsten points will ablate. To avoid these phenomenons, you should increase the tungsten points’ gap of distributor appropriately.

4. Bad capacitor work

Bad internal connection or bad connection between housing and ground will lead to bad capacitor work.
Checking way: using the way of disassembling capacitor to in contrast of high voltage electrical spark.

When you disconnect the power-off tungsten points, capacitor will absorb the surge voltage which is formed by the self-induced electromotive force of primary winding of the ignition coil to reduce spark discharge of tungsten points, and to avoid tungsten points being ablated, furthermore, improving the rate change of primary current, therefore, improving the high-pressure spark.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn