Product Background: Stainless steel has been widely used in many areas because of many excellent properties. Stainless steel has many models, it has big differences in performance、 usage and price, however, it is difficult to identify in appearance. To identify materials, the conventional means is to use spectroscopy or sent to a laboratory to do chemical analysis. But there are also some disadvantages. The former is mainly in the high cost of purchasing, a large number of users can not afford; the latter there is the portability and timeliness issues, not suitable for on-site rapid testing and high-volume sorting test. Based on the above background, our company's R&D team developed a series of stainless steel rapid testing reagents, a good solution to the shortcomings of existing technology.
Product Theory: Different grades of stainless steel have different anti-rust capability. The product distinguishes the different stainless steel according to anti-rust properties.
Product Use: Often used to distinguish 200、300 and 400 series stainless steels. 
Product Features: Rapid testing、 low cost、 obvious effect、 easy carry、 non-destructive testing、 easy operate. In on-site rapid testing of stainless steel、 sorting of stainless steel scrap、 recycling and reuse, it has irreplaceable role.
Method of Using: Drop a glob of determine liquid on the surface of material and do not switch on power at first.
For 200 series stainless steel without nickel, position with the liquid will turn in dark wine in about 5 seconds;
For 200 series stainless steel with 1% nickel, position with the liquid will turn in wine in about 5 seconds;
For 202 stainless steel with 4% nickel, if position with the liquid does not turn in red in about 10 seconds, switch on power and keep reacting 5 seconds, and then switch off the battery, position with the liquid will turn in brick red in about 30 seconds;
For 301 Stainless Steel with 6% nickel, if position with the liquid does not turn in red in about 10 seconds, switch on power and keep reacting 5 seconds, and then switch off the battery, position with the liquid will turn in light brick red in about 6 minutes;
For 304 stainless steel with 8% nickel, if position with the liquid does not turn in red in about 10 seconds, switch on power and keep reacting 5 seconds, and then switch off the battery, position with the liquid will not change in 15 minutes;
For 409 & 410 stainless steel with 11% chromium, position with the liquid will turn in dark brick red in about 5 seconds;
For 430 stainless steel with 16% chromium, if position with the liquid does not turn in red in about 10 seconds, switch on power and keep reacting 5 seconds, and then switch off the battery, position with the liquid will turn in dark brick red in about 1 second;
For 443 stainless steel with 21% chromium, if position with the liquid does not turn in red in about 10 seconds, switch on power and keep reacting 5 seconds, and then switch off the battery, position with the liquid will not change in 15 minutes.
In short, the anti-rust capability of material is worse, the speed of turning is more quickly and the color is darker; otherwise is the opposite. As for the 200 series, 300 series and 400 series stainless steel ,it can be  distinguished through magnetic. 200 series and 300 series stainless steel are the non-magnetic or weakly magnetic,400 series stainless steel was strong magnetic.
Cautions:
1、Cleaning the dust、dirty、oil or moisture on the surface of material.
2、Drop the determine liquid on the material, about 3mm will be the best.( the negative electrode must not touch steel, the battery must have enough power)
3、This product has the slight corrosiveness, if skin is contacted by the liquid, rinse at once by water.
4、When using the determine liquid, please be sure not to exchange the cap of bottle, and cover cap after using, in case the liquid lose the function.
5、The spot of steel which already be tested, should not used as test spot again or you must clean this place. And the negative electrode wire should also be cleaned before used again, to avoid interference.
6、All foresaid test results are approximate and for the stainless steel with same brand number, phenomena will be slightly different if tissue, composition and other anti-rust capability have changed.
Liability: The manufacturer and its authorized agents are free from any liabilities due to taking by accident of children and misunderstanding or misuse of the users. If nickel contamination is suspected based on this test, consult an analytical testing laboratory and take the necessary precautions.
Appearance: Green liquid.
Package of the Product: LDPE bottle.
Specifications: 10ml
Product standard: QB-TCS-SSDL-2007
Validity: 1 year
Store: Store in the cool and keep away from child. (It is better to store in freezer.)
Manufacturer: NINGBO THAILE CHEMICAL TECHNOLOGY CO., LTD.
Website: http://8qqos3p5ki.com