Pretend to be alert to the faucet manufacturing use
11-14
Recently, the jiangsu province pledges inspect bureau to 56 batches (tap) water mouth quality monitoring, found that more than half of the sample quality is not up to standard. , fresh quality risk analysis report: the sample is not in conformity with the relevant standards have 31 in batch, not coincidence rate was 55.3%. Among them, 51 batches in commercially available products not coincidence rate was 60.8%; 5 batch product from production enterprises in jiangsu province coincidence rate was 100%.
Suzhou quality inspection to the monitoring of chemical project detection. What are the outstanding problem monitored the faucet on earth? Yesterday, reporters from suzhou qualitative inspect branch further analysis solutions are obtained.
Zinc alloy "manipulation" as copper alloy
Faucet according to different materials can be divided into stainless steel, cast iron, plastic, copper alloy, zinc alloy, polymer composite materials, etc. Among them, made of zinc alloy faucets generally live shorter, less stability. Will take effect on December 1 of the ceramic chip seal water mouth "specified in the national standard (GB18145-2014) : water mouth direct contact parts should not use zinc alloy material. In the monitoring, inspection researchers found that there are on the market at present to pretend to be copper alloy zinc alloy tap tap phenomenon.
The reporter understands from suzhou city quality supervision, inspection, claims to be the accept risk monitoring "copper" faucet lots have 53, through qualitative appraisal, nine batch samples for zinc more than 95% of the zinc alloy, not coincidence rate was 17.0%. "Some vendors to reduce costs, zinc alloy material is widely used, because the density of zinc itself is bigger also, the product itself also have electric plating, ordinary consumers can't distinguish from feel, weight, appearance, it is easy to the sham as the genuine in the market", the inspectors said.
According to introducing, the zinc alloy substrate material is not suitable for direct contact with water, because with the faucet made of this material in the coating corrosion resistance, contamination precipitation and the poor durability performance, use after a period of time will appear crack, crack, even cause leaks, and even a few products in use after a period of time will generate lumen powder. Also there is a big hidden danger to the health of consumers, consuming too much zinc may inhibit the body's absorption of iron and copper, iron deficiency anemia. Especially it is important to note that excessive zinc are difficult to discharge in vitro. And copper alloy faucet bactericidal performance is good, is also the mainstream of European and American countries now use the tap materials.
Twenty percent of copper alloy samples lead precipitation quantity to exceed bid
In addition to energy saving, water saving, safe, beautiful and quality index, the faucet precipitation amount of heavy metals is also a concern for health and safety indicators. 53 of the monitoring batch claim for copper alloy faucet, 11 batch samples detected lead precipitation than standard value, is not coincidence rate was 20.8%.
It is understood that the lead of faucet precipitation mainly comes from the copper alloy material contact with water. Some production companies will choose such as key copper, auto radiator copper brass recovery in production, which lead the mass fraction of 4% or so, even higher. Appropriate to join in the copper lead, mainly in order to improve the processability and improve the wear resistance copper. Lead in copper alloy tap can be directly after contact with water soluble out into the water. Stainless steel faucet because itself is extremely low, lead basic lead precipitation measured values. There is a close relationship between material and lead to precipitation.
Suzhou inspection hong-liu ding, director of the physical and chemical laboratory is introduced, the faucet in the risk monitoring also found another heavy metal exceeds bid - chromium exhalation. In 53 batch claim for copper alloy samples, there are two batch product set limit to of total chromium is beyond standard, which is not coincidence rate was 3.7%. Excess chromium precipitation is the main reason of the welding seam and surface finishes with chromium residue in precipitation, or materials containing chromium, precipitation in the soaking. Detection by the city quality supervision, inspection personnel introduces, although chromium is one of the biology necessary trace elements, but a lot of chromium exists not only pollute the environment, also can endanger human body health. All chromium compounds are toxic, and easy to be absorbed by human body, to accumulate in the body, including the hexavalent chromium excessive exposure can cause kidney, liver function failure. But in the risk monitoring, inspectors found no hexavalent chromium standard phenomenon.
This risk monitoring, arsenic, barium, hexavalent chromium, copper, mercury, selenium and thallium precipitate heavy metals has not been found to exceed bid.
Nearly half of copper alloy faucet is not resistant to corrosion
The acceptance monitoring of copper alloy faucet, there are 25 batches did not meet current standards GB18145-2003 standard specified in the 10 requirements, no coincidence rate was 47.2%. This also is another major of domestic water quality unqualified project.
Due to the use environment of faucet is commonly the bathroom, kitchen, etc., are damp and has a weak acid, such as detergent, detergent chemicals. During long time use, corrosive liquid and gas on the plating surface corrosion effect, can cause pitting and spot defects such as bubbles, rust, corrosion, not only aesthetically, and coating quality will directly affect the service life of the product, roughness and wear resistance.
The causes of such problems are many, mainly is the partial enterprises to adopt the low grade brass, back to the furnace charge to manufacture base. Some manufacturers use brass faucet body, while making the handle and cover in cheap inferior materials such as cast iron, such products in the corrosion test corrosion marks, often the body is not in the handle and other accessory parts will be serious corrosion.
Zinc alloy tap how to cause?
How to distinguish between genuine zinc alloy tap? Suzhou quality suggest that consumers: to know the material after watching the price again.
A brass faucets cost at least $100
Talk about the price first. Reporter understands from qualitative inspect branch to provide analysis report, at the current zinc alloy material of about 16000 yuan/ton, pure copper calculated the unit price of 68000 yuan/ton, the same weight of the cost of zinc alloy, only 1/3 of the copper. Zinc alloy is easy to machining, the machining cost is lower than copper alloy. According to industry standards, a faucet with about 500 grams of copper, a faucet light copper cost is almost in 34 yuan, plus other components, artificial, toll fee, freight, fees, water and electricity, etc., a normal copper faucet, direct manufacturing cost is not less than 100 yuan.
See the risk monitoring results: sample price from 100 yuan to 1800 yuan, of which 31 batches of the problem products are almost all focused on the range below RMB 300 yuan.
Then see material pledge. Due to a lot of zinc alloy faucets will do particularly heavy, traditionally by weight difference method is not accurate. Difference, therefore, suggest that consumers take the following ways: first, generally is casting, copper faucet products inside leveling sex is not very good. And zinc alloy tap is injected with grinding out, wall smooth will be many, and the lining have obvious dividing line.
In the conditional case, also can be in product inconspicuous places grinding open have a look at the color, the color of the zinc alloy white, yellow and copper alloy. In particular, online shopping, consumer products cannot be observed visually, so be especially careful, should choose to have the prestige guaranteed, support 7 days unconditional return of merchants to buy, keep buying vouchers, so that when problems arise.
Overnight off the tap water can decrease the content of heavy metals
There are two in daily use are also worthy of note: experiment according to the national standard test of lead precipitation amount, refers to the precipitation of water contact with leading wall 16 hours, shorter contact time, the smaller the amount of precipitation. Therefore, in daily use, water mouth lead content is much lower than the national standard, consumers need not panic. Put off overnight when using water retention in the tap water for a long time, can effectively reduce the risk. In addition, now in the family will use solar energy water heater, heating equipment, it is best not to will be in hot water as drinking water, because the content of heavy metals in water is higher than cold water.