Delta is a French company of personal protective equipment (PPE) that offers more than 1,500 protective products that protect users from head to toe, mostly in the industrial and civilian sectors. The vast majority of Deerta's products are manufactured and sold in accordance with EU standards.
 
Excellent filtration efficiency is the traditional advantage of delta masks. In 2014, the China Consumers Association tested 37 masks in six cities in China, and focused on three indicators of filtration effect, breathing resistance and fit according to the national standard. Among them, Delta's folding masks and cup-shaped masks perform well in terms of filtration effect, with scores basically the same as those of 3M, and the breathing resistance is also lower than that of many domestic manufacturers.
 
104019 and 104106 are two DELTA masks that meet the EU FFP3 filtration standard, with a particulate matter removal effect of more than 99%. The filter elements of both masks are made of non-woven fabric made of synthetic fibers, which effectively blocks oily and non-oily particles. The screw exhalation valve is located in the center of the hood, which has a slightly strange appearance, but significantly reduces expiratory resistance. 104019 bowl design, four adjustable elastic bands provide better comfort for users who wear masks for long periods of time, while the 104106 can be folded up and down in half, and there are only two elastic bands for easy wearing and removal.
 
There is no Asian style of delta masks, which are closer to the European face shape in size and design, and for Asians with smaller faces and lower nose bridges, the fit of the brand's various models of masks is poor, and gaps are prone to appear at the chin, cheekbones and nose bridge, and it is not easy to recover automatically, which has a great impact on its protective effect.
 
104117 is a replaceable cotton filter mask launched by Deerta, and the price of 110 yuan comes with an outer mold and filter cartridge, the latter can be purchased separately and reused, and the cost of use is lower than that of disposable masks. However, due to the need to take into account the convenience of replacing this kind of mask, there will be more or less gaps between the filter element and the outer mold, and the protective efficiency often fails to reach the level of FFP3 in the label, and the plastic outer mold is far lower than the cotton material used in disposable masks in terms of tightness, so it is not recommended to buy.
 
For consumers with a small budget, it is recommended to choose 104016, this mask has a filtration efficiency of FFP2, which meets most daily needs, and is equipped with an exhalation valve, and the price is only about 6 yuan, which is one of the lowest priced masks on the market under this protective efficiency.