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Anonymous users2024-02-16Give you the standard number, and check it yourself.
Hex Head Bolt GB T 5782-2000 Cross Groove Pan Head Self Tapping Screw GB845-85
Hexagon socket head screws GB T square head bolts grade C GB8-88
Standard Spring Washer GB93-87 Cross Groove Countersunk Self-Tapping Screw GB846-85
Hex Head Bolt Full Thread GB T 5783-2000 Hex Nut C Grade GB T41-2000
Square Nut Class C GB39-88 Slotted Cylindrical Head Screw GB T 65-2000
Wing Nut GB62-88 Hexagon Countersunk Screw GB T
Screw GB T 15389-94 Anchor bolt GB799-88
Hexagon Flat Round Head Screws GB T Half Round Head Square Neck Bolts GB12-88
Hexagon Flat End Set Screws GB T 77-2000 Cross Groove Pan Head Screws GB T 818-2000
Hex Thick Nut GB56-88 Cross Groove Pan Head Self Drilling Self Tapping Screws GB T
Round nut GB812-88 Hex head self tapping screw GB5285-85
Slotted countersunk screws GB T 68-2000 Hexagon flange face bolts Small series GB T 16674-1996
Hexagon Flange Face Bolt - Enlarged Series - Class B GB5789-86 Flat Washer Class C GB T 95-2002
Cap Nut GB923-88 Slotted Pan Head Self Tapping Screw GB5282-85
Wall panel tapping screws GB T 14210-93 Cross groove countersunk head tapping screws GB847-85
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Anonymous users2024-02-151. GB 2626-2006 has been repealed, and the corresponding updated standard is "GB 2626-2019 Respiratory Protection Self-priming Filtering Anti-Particulate Respirator"; This standard applies to self-priming filtering respirators that protect against particulate matter, non-medical mask standards.
2. Filtration efficiency under the condition of air flow (85 2) l min, the filtration efficiency of aerodynamic median diameter (sodium chloride aerosol is not less than 95%, that is, in line with N95 (or FFP2) and above grades.
3. The diameter that can block airborne transmission.
4. In line with the YY0469-2004 "Technical Requirements for Medical Surgical Masks" standard, the important technical resistance indicators include filtration efficiency, bacterial filtration efficiency and respiratory resistance.
5. The specific indicators are as follows: 1) Filtration efficiency of the belt of Guochang: under the condition of air flow (30 2) l min, the filtration efficiency of the aerodynamic median diameter (sodium chloride aerosol is not less than 30%.
Bacterial filtration efficiency: Under the specified conditions, the filtration efficiency of Staphylococcus aureus aerosols with an average particle diameter of (3) is not less than 95%; Bacterial filtration rate should be 95%; The filtration rate of non-oily particles should be 30%.
Respiratory resistance: Under the condition of filtration efficiency flow, the inspiratory resistance does not exceed 49pa, and the expiratory resistance does not exceed.
8. When the pressure difference p between the two sides of the mask for gas exchange is 49pa cm, the gas flow rate should be 264mm s.
GB is the meaning of the national standard, 13237 is a standard number, is the following standard name! >>>More
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