Recently, at the WTO Technical Barriers to Trade Committee meeting, many members of the WTO raised trade concerns related to tire problems.
The tire problem that the meeting focused on was mainly that members expressed concern about the tire-related control measures introduced by the EU and Saudi Arabia. In this regard, China questioned the scientific basis of the EU tire testing method and stressed that this would add a lot of cost to the producers.
At this meeting, member delegations presented 17 new trade concerns and 39 trade concerns that have been raised previously. This has increased the number of trade concerns raised by WTO members this year to 92, reaching the second peak since 1995.
It is reported that the Technical Barriers to Trade Committee often holds information exchange meetings for WTO members. This kind of dialogue helps resolve trade frictions and avoids unnecessary trade disputes.
At the committee meeting, WTO members have the opportunity to raise trade concerns if they believe that other members implement measures that are not in compliance with the Agreement on Technical Barriers to Trade.
These specific trade concerns (STCs) may be related to the standards, testing and certification procedures, rules or labeling requirements imposed by the importing party, and these measures may have an impact on the producers and consumers of such commodities. STCs may highlight potential trade restrictions and include them in the WTO's regular trade monitoring report.
At the meeting, members also agreed on the work plan of the Technical Barriers to Trade Committee in 2016-2018.
Colloidal Silica For Investment Casting
Silica Sol used in thin shell precision casting can make shell shape with high strength and high casting finish.The molding quality used is superior to sodium silicate.Instead of ethyl silicate molding can reduce the cost and improve the operating conditions.Silica sol casting belongs to investment casting.The general process is as follows:
1. First, mold is made according to the shape of the parts.
2. Then use the mold to make the same wax mold as the part.
3. When the wax mold is put into a paste made of silica sol and quartz sand, the wax mold will have a layer of paste and then solidify.After many times of impregnation and curing, the basic mold was formed.
4. Dewaxing, put the mold in hot water, the wax will melt and float on the water, leaving the mold shell
5. Casting molding
Investment casting is a widely used precision casting method in the field of precision casting. This casting method has high dimensional accuracy, good surface quality, and can effectively reduce the cost and improve the competitiveness of precision casting.
Silica sol precision casting is a kind of high quality binder commonly used in investment casting. It is a stable colloidal solution formed by the dispersion of amorphous silica particles in water. Silica sol is easy to use and has good coating stability. The shell does not need chemical hardening, the supply and demand of the shell is simple, the high temperature performance, high temperature strength and high temperature deformation resistance of the shell.
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