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REFERENCE NUMBER: T-6543

MEDICAL UNIVERSAL TENSILE TESTING EQUIPMENT

SHANDONG INDEPENDENTLY RESEARCH AND DEVELOPMENT THIS COMPREHENSIVE TESTING MACHINE FOR SURGICAL MASK & PROTECTIVE CLOTHING, IT IS WIDELY USED IN A VARIETY OF MASK STRENGTH DETECTION PROJECTS.FEATURES:COMPLY WITH NATIONAL STANDARDS, MEDICAL STANDARDS TESTING REQUIREMENTS, AUTOMATIC SOFTWARE CONTROL SYSTEM, MEET THE REQUIREMENTS OF DATA STORAGE, PRINTING, COMPARISON. THE IMPORTED SERVO MOTOR IS EQUIPPED WITH PRECISION SCREW DRIVE SYSTEM TO ENSURE THE STABILITY OF TEST DATA.

TEST STANDARDS:

GB 19082-2009 TECHNICAL REQUIREMENTS FOR DISPOSABLE PROTECTIVE CLOTHING FOR MEDICAL USE (4.5 BREAKING STRENGTH -THE BREAKING STRENGTH OF MATERIALS IN KEY PARTS OF PROTECTIVE CLOTHING SHOULD NOT BE LESS THAN 45N)

(4.6 ELONGATION AT BREAK -THE ELONGATION AT BREAK OF KEY PARTS OF PROTECTIVE CLOTHING SHOULD NOT BE LESS THAN 15%)

SELF-PRIMING FILTER RESPIRATOR FOR RESPIRATORY PROTECTION ARTICLES5.6.2 BREATHING BONNET -BREATHING BONNET SHALL BE SUBJECT TO AXIAL TENSION"DISPOSABLE MASK: 10N FOR 10S" "REPLACEABLE MASK: 50N FOR 10S"

(5.9 HEADBAND -HEADBAND SHOULD BEAR THE TENSION "DISPOSABLE MASK: 10N, 10S" "REPLACEABLE HALF MASK: 50N FOR 10S" "FULL MASK: 150N FOR 10S")

5.10 JOINTS AND CONNECTING PARTS -JOINTS AND CONNECTING PARTS SHALL BE SUBJECT TO AXIAL TENSION

"REPLACEABLE HALF MASK: 50N FOR 10S" "FULL COVER 250N FOR 10S"

GB/T 32610-2016 TECHNICAL SPECIFICATION FOR DAILY PROTECTIVE MASKS

(6.9 BREAKING STRENGTH OF THE MASK BELT AND THE CONNECTION BETWEEN THE MASK BELT ANDTHE MASK BODY ≥ 20N)

(6.10 FASTNESS TO BREATHING BONNET: NO SLIPPAGE, BREAKAGE OR DEFORMATION SHALL OCCUR)

YY/T 0699-2013 DISPOSABLE SURGICAL MASK

(4.4 MASK BELT -THE BREAKING FORCE AT THE CONNECTION POINT BETWEEN EACH MASK BELT AND THE MASK BODY IS NOT LESS THAN 10N)

YY 0469-2011 SURGICAL MASK FOR MEDICAL USE (5.4.2 MASK BELT)

GB/T 3923.1-1997 DETERMINATION OF BREAKING STRENGTH AND ELONGATION AT BREAK OF FABRICS (STRIP METHOD)

DISPOSABLE RUBBER INSPECTION GLOVES (6.3 TENSILE PROPERTIES)

INSTRUMENT TECHNICAL PARAMETERS:

SPECIFICATION: 200N (STANDARD) 50N, 100N, 500N, 1000N (OPTIONAL)

ACCURACY: BETTER THAN 0.5RESOLUTION OF FORCE VALUE: 0.1N

DEFORMATION RESOLUTION: 0.001mm

TEST SPEED: 0.01mm/MIN ~ 2000mm/MIN (STEPLESS SPEED REGULATION)

WIDTH OF SAMPLE: 30mm (STANDARD FIXTURE) 50mm (OPTIONAL FIXTURE)

CLAMPING OF SAMPLES: MANUAL (PNEUMATIC CLAMPING CAN BE CHANGED)

STROKE: 700mm (STANDARD) 400mm, 1000mm (OPTIONAL)

QUANTITY: 1

REFERENCE NUMBER: T-6545

MASK BACTERIAL FILTRATION EFFICIENCY (BFE) DETECTOR TESTER

PRODUCT INTRODUCTION:

MASK BACTERIA FILTRATION EFFICIENCY KEY PERFORMANCE INDICATORS (BFE) DETECTOR TESTER NOT ONLY CONFORMS TO THE REQUIREMENTS OF MEDICAL SURGICAL MASKS TECHNOLOGY YY0469-2011 APPENDIX B IN THE TEST METHOD FOR FILTER EFFICIENCY (BFE) BACTERIA FIRST B. 1.1.1 TEST INSTRUMENT, BUT ALSO CONFORMS TO THE AMERICAN SOCIETY FOR TESTING MATERIAL ASTMF2100, ASTMF2101, THE REQUIREMENTS OF THE EUROPEAN EN14683 STANDARDS, INNOVATIVE IMPROVEMENTS WERE MADE ON THE BASIS OF THIS, WITH DOUBLE PNEUMATIC CONTRAST SAMPLING METHOD AT THE SAME TIME, IMPROVE THE PRECISION OF SAMPLING,IT IS SUITABLE FOR MEASURING AND TESTING DEPARTMENTS, SCIENTIFIC RESEARCH INSTITUTES, MASK MANUFACTURERS AND OTHER RELEVANT DEPARTMENTS TO TEST THE PERFORMANCE OF MASK BACTERIAL FILTRATION EFFICIENCY.

EXECUTION STANDARD:

Q/0212 ZRB003-2015 MEDICAL SURGICAL MASK

BACTERIAL FILTRATION EFFICIENCY (BFE) DETECTOR RELATED INTELLECTUAL PROPERTY:

NO.: ZL200820224142.6 ELECTRIC FLOW CONTROL VALVE

NO.: ZL200820224143.0 GAS CAPACITY

NO.: ZL200920308391.8 AIR FILTRATIONMATERIAL FILTRATION EFFICIENCY DETECTOR

PRODUCT FEATURES:

NEGATIVE PRESSURE TEST SYSTEM TO ENSURE THE SAFETY OF OPERATORS;

BUILT -IN PERISTALTIC PUMP IN NEGATIVE PRESSURE CABINET, A, B TWO -WAY, SIX ANDERSEN; THE PERISTALTIC PUMP FLOW CAN BE SET;

THE FLOW RATE OF NIGHT SPRAY CAN BE SET AND THE ATOMIZATION EFFECT IS GOOD.

EMBEDDED HIGH SPEED INDUSTRIAL MICROCOMPUTER CONTROL; 10.4 INCHES INDUSTRIAL HIGH BRIGHTNESS COLOR TOUCH SCREEN;

USB INTERFACE, SUPPORT U DISK DATA STORAGE;

CABINET BUILT-IN HIGH BRIGHTNESS LIGHTS; BUILT-IN LEAKAGE PROTECTION SWITCH TO PROTECT THE SAFETY OF OPERATORS;

THE INNER LAYER OF THE CABINET IS MADE OF STAINLESS STEEL, THE OUTER LAYER IS SPRAYED WITH PLASTIC AND COLD-ROLLED, AND THE INNER AND OUTER LAYERS ARE INSULATED AND FLAME RETARDANT.

THE FRONT SWITCH TYPE GLASS DOOR IS CONVENIENT FOR THE EXPERIMENTER TO OBSERVE AND OPERATE.

DETACHABLE BRACKET, ADJUSTABLE BRACKET HEIGHT; SUPPORTING AND MOVING DUAL PURPOSE CASTERS.

QUANTITY: 1

REFERENCE NUMBER: T-6550

MEDICAL PROTECTIVE CLOTHING BLOOD SYNTHETIC PENETRABILITY TESTER

TECHNICAL SPECIFICATIONS AND CONFIGURATION:

1. THE INSTRUMENT ADOPTS AN AIR SOURCE THAT CAN PROVIDE (0.5 ~ 30±0.1) KPA PRESSURE TO CONTINUOUSLY PRESSURIZED THE SAMPLE, WHICH IS NOT RESTRICTED BY THE SPACE OF THE TEST SITE;

2. THE AIR PRESSURE RANGE CAN BE ADJUSTED FREELY, AND THE ADJUSTMENT RANGE (0.5 ~ 30) KPA;

3. COLOR TOUCH SCREEN DISPLAY AND OPERATION;

4. THE SAMPLE CLAMPING PAD IS PROCESSED WITH IMPORTED SPECIAL ALUMINUM PROFILES, WHICH IS LIGHT IN MATERIAL, CLEAN IN SURFACE AND NEVER RUSTS.

5. THE INSTRUMENT ADOPTS IMPORTED SPECIAL ALUMINUM WIRE DRAWING PANEL, EQUIPPED WITH METAL KEYS, SENSITIVE OPERATION, NOT EASY TO DAMAGE;

6. CLAMPING DEVICE FOR INSTRUMENT SAMPLES, EQUIPPED WITH LOCKING PROTECTION, TO PREVENT THE SYNTHETIC BLOOD FROM SPLASHING AROUND;

7. CLAMPING FORCE IS ACCURATE AND RELIABLE;

8. THE TEST TANK IS EQUIPPED WITH A SPECIAL PLACEMENT DEVICE, WHICH IS CONVENIENT FOR CUSTOMERS TO OPERATE;

9. THE TEST TANK IS PROCESSED WITH SPECIAL 316 STAINLESS STEEL, AND THE TOP IS EQUIPPED WITH A SPECIAL COVER FOR HIGH TRANSPARENT PROTECTION;

10. THE WASHER BELOW THE SAMPLE IS MADE OF HIGH-QUALITY PTFE MATERIAL AFTER SPECIAL PROCESSING;

11. SQUARE METAL BLOCK NET: OPEN SPACE ≥50°%; BENDING ≤5mm AT 30KPA;

12. INSTRUMENT TIME CONTROL ACCURACY ≤01 SECONDS;

13. THE SHELL OF THE INSTRUMENT IS MADE OF HIGH-QUALITY METAL BAKING PAINT, WHICH IS BEAUTIFUL AND GENEROUS.

14. EQUIPPED WITH PRINTER INTERFACE, CONNECTED TO THE PRINTER CAN DIRECTLY PRINT DATA REPORTS.

TECHNICAL PARAMETERS:

1. SAMPLE SIZE: 75mm X 75mm

2. TEST AREA: 28.26 SQUARE CENTIMETERS

3. AIR PRESSURE ADJUSTMENT RANGE (0.5 ~ 30) KPA

4. EXTERNAL SIZE: 500mm X 500mm X 500mm (L X W X H)

5. WEIGHT OF THE INSTRUMENT: 40 KG

6. POWER SUPPLY: AC220V, 50HZ,SCOPE OF SUPPLY: 1. ONE MAIN MACHINE; 2. TWO PTFE GASKETS; 3. TWO ORDINARY WASHERS; 4. ONE METAL BLOCKING NET; 5. A SET OF SPECIAL LOCKING TOOLS; 6. ONE HIGH-QUALITY SILENT AIR PUMP, [NOTE: SAFETY PRODUCTION LICENSE IS NOT INCLUDED]. 7. EQUIPPED WITH PRINTER INTERFACE; 8. ONE SAMPLE TEMPLATE; 9. ONE PRODUCT CERTIFICATE; 10. ONE COPY OF PRODUCT OPERATION MANUAL.

OPERATION INSTRUCTION:

INSERT THE AIR PUMP OUTPUT PIPE INTO THE OIL AND WATER SEPARATOR OF THE INSTRUMENT AS REQUIRED (PRESSURE 0.1-0.3MPA).

AFTER SWITCHING ON THE POWER, THE STARTUP INTERFACE (NAME OF THE DEVICE) IS DISPLAYED.

PRESS THE "ENTER" BUTTON TO ENTER THE TEST INTERFACE, AS SHOWN IN THE FOLLOWING FIGURE:

CLICK "SETTING” BUTTON, GET INTO PARAMETER SETTING SCREEN, AS BELOW THIS SCREEN CAN SET THE SYSTEM TIME, DATE AND TESTING TIME, AFTER SETTING, CLICK "SAVE” BUTTON TO KEEP THE SETTING DATA. (NOTE: IT REQUIRES 5 MINUTES IN THE STANDARD)

QUANTITY: 1

REFERENCE NUMBER: T-6552

MASK AIR TIGHTNESS TESTER

MASK AIR TIGHTNESS TESTER

HOW TO CHOOSE A HIGH-QUALITY MASK NOT ONLY DEPENDS ON THE FILTERING EFFICIENCY OF THEMASK, BUT ALSO TO CONFIRM WHETHER THE MASK IS COMPLETELY IN CONTACT WITH THE FACE, OTHERWISE AEROSOL PARTICLES SUCH AS GERMS THAT HAVE NOT BEEN FILTERED BY THE MASK WILL BE INHALED FROM THE INADEQUATE ADHESION. THEREFORE, IT IS VERY IMPORTANT TO CHECK THE WEARING STATUS OF THE MASK. THE EUROPEAN AND AMERICAN COUNTRIES HAVE LISTED THE APPLICATION TEST OF THE MASK AS A STRONG INSPECTION ITEM.

FOR EXAMPLE, THE N95 MASK IS ONE OF 9 TYPES OF PARTICULATE PROTECTIVE MASKS CERTIFIED BY NIOSH (NATIONAL INSTITUTE OF OCCUPATIONAL SAFETY AND HEALTH). "N" INDICATES OIL RESISTANCE."95" INDICATES THAT THE PARTICLE CONCENTRATION IN THE MASK IS MORE THAN 95% LOWER THAN THAT OF THE PARTICLES OUTSIDE THE MASK WHEN EXPOSED TO THE SPECIFIED NUMBER OF SPECIAL TEST PARTICLES. N95 IS NOT A SPECIFIC PRODUCT NAME, AS LONG AS IT MEETS THE N95 STANDARD AND PASSES THE NIOSH REVIEW, IT CAN BE CALLED "N95 MASK".

N95 TYPE MASKS, IN ADDITION TO THE FILTERING EFFICIENCY OF THE MASKS, THE CLOSENESS OF THE MASKS TO THE FACE IS ONE OF THE IMPORTANT FACTORS THAT DETERMINE THE EFFECTIVENESS OF THE USE OF THE MASKS. THE SUITABILITY OF DIFFERENT TYPES OF MASKS FOR THE HUMAN FACE VARIES GREATLY.

THEREFORE, BEFORE USING A MASK, THE SUITABILITY OF THE MASK SHOULD BE CHECKED FIRST. DURING THETIGHTNESS TEST OF THE WEARER'S FACE, ENSURE THAT AIR CAN PASS IN AND OUT THROUGH THE MASK WHEN IT IS CLOSE TO THE EDGE OF THE FACE. THE MASK TIGHTNESS TESTER CAN QUICKLY COMPLETE THE TIGHTNESS TEST OF RESPIRATORS SUCH AS MASKS TO ENSURE THAT IT PROVIDES GOOD PROTECTION PERFORMANCE. IT CONFORMS TO THE CHINESE RESPIRATOR STANDARD GB2626-2019 STANDARD, OSHA / CSA STANDARD AND CHINA GENERAL ADMINISTRATION OF QUALITY SUPERVISION, INSPECTION AND QUARANTINE "GB 19083-2010 TECHNICAL REQUIREMENTS FOR MEDICAL PROTECTIVE MASKS" JOINTLY ISSUED BY THE CHINA NATIONAL STANDARDIZATION ADMINISTRATION COMMITTEE.

ADHESION (SUITABILITY TEST): THE MASK DESIGN SHOULD PROVIDE GOOD ADHESION. THE OVERALL FIT FACTOR OF THE MASK SHOULD NOT BE LESS THAN 100. THIS TEST THE REQUIREMENTS WERE FORMALLY IMPLEMENTED ON AUGUST 1, 2011.

FEATURES
0.3 - 25 µm SENSITIVITY
FLOW RATE: 1.0 CFM (28.3 LPM)
UP TO 8 CHANNELS OF SIMULTANEOUS COUNT DATA
21 CFR PART 11 COMPLIANT SECURE USB FLASH TRANSFER
EXTREME LIFE LASER DIODE TECHNOLOGY >20-YEAR MTTF
5.7 INCH COLOR TOUCH SCREEN DISPLAY
THERMAL PRINTER
STAINLESS STEEL CONSTRUCTION
ETHERNET/RS485/MODBUS, 4x 4-20mA ANALOG INPUTS
3,000 RECORD DATA STORAGE
50-RECORD CONFIGURABLE RECIPE DATABASE
REPORT WIZARD: FS-209E, ISO-14644-1 & EU GMP ANNEX 1
2 YEAR WARRANTY

STANDARD 6 CHANNELS: 0.3, 0.5, 1.0, 3.0, 5.0, 10.0 µm , 0.3, 0.5, 1.0, 5.0, 10.0, 25.0 µm
STANDARD 8 CHANNELS: 0.3,0.5,0.7,1.0,3.0,5.0,7.0,10.0 µm
OPTIONAL 8 CHANNELS: OPTIONAL BETWEEN 0.3 AND 25.0 µm
COUNTING EFFICIENCY: 50%@0.3µm; 100% FOR PARTICLES > 0.45 µm (PER ISO 21501-4)
CONCETRATION LIMITS: 1,000,000 PARTICLES/FT3, (35,300,000/M3) @ 10% COINCIDENCE LOSS SUITABLE FOR ISO CLASSES 1-8 CLEANROOMS
DIMENSIONS: 9.5”(L) x 8.0”(W) x 10.2”(H) (24.13 x 20.32 x 25.9 cm)
WEIGHT: WITH BATTERY: 13.95 LBS (6.33 KG), WITHOUT BATTERY 12.35 LBS (5.6 KG)

INCLUDES
OPERATING MANUAL WITH CD, LMS EXPRESS TRANSFER SOFTWARE DOWNLOAD INSTRUCTIONS, ISOKINETIC SAMPLE PROBE, TRIPOD, TUBING, PURGE FILTER, POWER CABLES, SPARE FUSE, PRINTER, PRINTER PAPER

LEAD TIME: 1 TO 2 WEEKS FROM RECEIPT OF ORDER

QUANTITY: 1

NON-INVASIVE VENTILATOR
CERTIFICATE: CE
MEDICAL VENTILATOR
TECHNICAL PARAMETERS OF DOUBLE LEVEL VENTILATOR
VENTILATOR TYPE: ELECTRIC CONTROL
SCOPE OF APPLICATION: TREATMENT AND TITRATION OF SLEEP APNEA HYPOPNEA SYNDROME, SEVERE SNORING, AND RESPIRATORY INSUFFICIENCY.
DISPLAY INTERFACE: 3.5-INCH LED SCREEN, CHINESE OPERATING SYSTEM
*VENTILATION MODE: CPAP, S, S/T, T
PRESSURE RANGE:
PRESSURE RANGE: 4-30CMH2O (±0.5CMH2O)
PRESSURE ACCURACY: + 0.5CMH2O
PARAMETER SETTING:
DELAYED BOOST: 0-60MIN, SET THE DIVISION INTERVAL 5MIN
INITIAL PRESSURE: 4CMH2O TREATMENT PRESSURE / RESPIRATORY PRESSURE SETTING
THERAPEUTIC PRESSURE: 4-20CMH2O (IN CPAP MODE)
TARGET TIDAL VOLUME: 150ML - 1500ML, ON/ OFF
MAXIMUM SUCTION PRESSURE: 4-30CMH2O, (CAN BE SET WHEN THE TARGET TIDAL VOLUME FUNCTION IS ON)
MINIMUM SUCTION PRESSURE: 4-30CMH2O (NOT HIGHER THAN THE SUCTION PRESSURE), (CAN BE SET WHEN THE TARGET TIDAL VOLUME FUNCTION IS ON)
INSPIRATORY PHASE PRESSURE: 4-30CMH2O
EXPIRATORY PRESSURE: 4-30CMH2O
EXPIRATORY DECOMPRESSION: PATIENT, OFF, 1-3, THREE ADJUSTABLE
MANUAL VOLTAGE REGULATION: 0-2 GEAR, 0-2CMH2O (ONLY AVAILABLE IN CPAP MODE)
INSPIRATORY SENSITIVITY: 1-8 STALLS
EXPIRATORY SENSITIVITY: 1-8 STALLS
RESPIRATORY FREQUENCY: 3-40 TIMES / MIN
INSPIRATORY TIME: 0.3-3.0S
BACKUP RATE: ON / OFF, DEFAULT 10
PRESSURE RISE TIME: 1-4 STALLS
HUMIDIFIER: 1-5 ADJUSTABLE IN 5 GEARS
*TITRATION FUNCTION: SUPPORT MANUAL AND AUTOMATIC PRESSURE TITRATION, BUILT-IN REMOTE WIRELESS COMMUNICATION MODULE, COMPLETE THE RANDOM SWITCHING OF SINGLE AND DOUBLE LEVEL MODES IN THE TITRATION PROCESS, AND CONTROL MORE THAN 11 VENTILATOR PARAMETERS AT THE SAME TIME.
AUXILIARY FUNCTION: AUTOMATIC AIR LEAKAGE COMPENSATION, AUTOMATIC STARTUP, AUTOMATIC SHUTDOWN, DELAYED SHUTDOWN, SCREEN BACKLIGHT ADJUSTMENT
MONITORING PARAMETERS: PRESSURE, TIDAL VOLUME, RESPIRATORY RATE, MINUTE VENTILATION VOLUME, AIR LEAKAGE VOLUME, INSPIRATORY TIME, BLOOD OXYGEN SATURATION
WAVY CURVE: PRESSURE TIME WAVEFORM, FLOW RATE TIME WAVEFORM
ALARM PROMPT: PIPELINE AND MASK FALLING OFF, AIR LEAKAGE PROMPT, POWER INTERRUPTION, TREATMENT MACHINE FAILURE, HUMIDIFIER FAILURE, LOW VOLTAGE, HIGH RESPIRATORY RATE, LOW RESPIRATORY RATE, LOW MINUTE VENTILATION VOLUME, LOW BLOOD OXYGEN, REPLACEMENT OF FILTER COTTON, FULL SD CARD, RE INSERTION OF SD CARD
*DATA MANAGEMENT:
NETWORK DATA: BMC + RESPIRATORY HEALTH MANAGEMENT CLOUD PLATFORM
SD CARD DATA: RESART NPAP DATA ANALYSIS SOFTWARE
PARTS:
SD CARD: STANDARD
SD CARD SLOT: STANDARD
PIPING: 9 22MM, 1.8M LONG
FACE SHIELD: F2 NOSE MASK AS STANDARD
NOISE: LESS THAN 30DB
ENVIRONMENT CONDITION:
TEMPERATURE:
(WHEN USED) 5 -35 C
(DURING TRANSPORTATION AND STORAGE) -20 C -55 C
ATMOSPHERIC PRESSURE:
(WHEN USED) 760-1060HPA
(DURING TRANSPORTATION AND STORAGE) 760-1060HPA
WORKING HOURS: MORE THAN 8 HOURS
POWER SUPPLY REQUIREMENTS:
AC VOLTAGE: 100-240V
FREQUENCY: 50HZ/60HZ
INPUT POWER: LESS THAN 2A
WATERPROOF LEVEL: IP22 - DRIP PROOF EQUIPMENT
INSTRUMENT SIZE: 290mm X 180mm X 134mm
WEIGHT: 1.5KG (EXCLUDING HUMIDIFIER) 2.5KG (INCLUDING HUMIDIFIER)
ITEM 001
QUANTITY: 10 SETS-999 SETS
ITEM 002
QUANTITY: 1,000 SETS-9,999SETS
ITEM 003
QUANTITY: ≥10,000 SETS

Federal health officials have now recommended that we cover our faces with fabric during the coronavirus pandemic. But what material offers the most protection?

The Centers for Disease Control and Prevention has posted a no-sew mask pattern using a bandanna and a coffee filter as well as a video on making masks using rubber bands and folded fabrics found at home.

While a simple face covering can reduce the spread of coronavirus by blocking outgoing germs from coughs or sneezes of an infected person, experts say there is more variation in how much homemade masks might protect the wearer from incoming germs, depending on the fit and quality of the material used.

Scientists around the country have taken it upon themselves to identify everyday materials that do a better job of filtering microscopic particles. In recent tests, HEPA furnace filters scored well, as did vacuum cleaner bags, layers of 600-count pillowcases and fabric similar to flannel pajamas. Stacked coffee filters had medium scores. Scarves and bandanna material had the lowest scores, but still captured a small percentage of particles.

If you don’t have any of the materials that were tested, a simple light test can help you decide whether a fabric is a good candidate for a mask.

“Hold it up to a bright light,” said Dr. Scott Segal, chairman of anesthesiology at Wake Forest Baptist Health who recently studied homemade masks. “If light passes really easily through the fibers and you can almost see the fibers, it’s not a good fabric. If it’s a denser weave of thicker material and light doesn’t pass through it as much, that’s the material you want to use.”

Researchers say it’s important to remember that lab studies are conducted under perfect conditions with no leaks or gaps in the mask, but the test methods give us a way to compare materials. And while the degree of filtration for some homemade masks seems low, most of us — who are staying home and practicing social distancing in public — don’t need the high level of protection required for medical workers. More important, any face covering is better than none, especially if worn by a person who has the virus but doesn’t know it.

The biggest challenge of choosing a homemade mask material is to find a fabric that is dense enough to capture viral particles, but breathable enough that we can actually wear it. Some items being touted online promise high filtration scores, but the material would be unwearable.

Dressing Up for Work … at Home
Yang Wang, an assistant professor of environmental engineering at Missouri University of Science and Technology, worked with his graduate students to study various combinations of layered materials — including both air filters and fabric. “You need something that is efficient for removing particles, but you also need to breathe,” said Dr. Wang, who last fall won an international award for aerosol research.

To test everyday materials, scientists are using methods similar to those used to test medical masks, which everybody agrees should be saved for medical workers who are exposed to high doses of virus from seeing infected patients. The best medical mask — called the N95 respirator — filters out at least 95 percent of particles as small as 0.3 microns. By comparison, a typical surgical mask — made using a rectangular piece of pleated fabric with elastic ear loops — has a filtration efficiency ranging from 60 to 80 percent.

Dr. Wang’s group tested two types of air filters. An allergy-reduction HVAC filter worked the best, capturing 89 percent of particles with one layer and 94 percent with two layers. A furnace filter captured 75 percent with two layers, but required six layers to achieve 95 percent. To find a filter similar to those tested, look for a minimum efficiency reporting value (MERV) rating of 12 or higher or a microparticle performance rating of 1900 or higher.

The problem with air filters is that they potentially could shed small fibers that would be risky to inhale. So if you want to use a filter, you need to sandwich the filter between two layers of cotton fabric. Dr. Wang said one of his grad students made his own mask by following the instructions in the C.D.C. video, but adding several layers of filter material inside a bandanna.

Dr. Wang’s group also found that when certain common fabrics were used, two layers offered far less protection than four layers. A 600 thread count pillow case captured just 22 percent of particles when doubled, but four layers captured nearly 60 percent. A thick woolen yarn scarf filtered 21 percent of particles in two layers, and 48.8 percent in four layers. A 100 percent cotton bandanna did the worst, capturing only 18.2 percent when doubled, and just 19.5 percent in four layers.

The group also tested Brew Rite and Natural Brew basket-style coffee filters, which, when stacked in three layers, showed 40 to 50 percent filtration efficiency — but they were less breathable than other options.

If you are lucky enough to know a quilter, ask them to make you a mask. Tests performed at the Wake Forest Institute for Regenerative Medicine in Winston-Salem, N.C., showed good results for homemade masks using quilting fabric. Dr. Segal, of Wake Forest Baptist Health, who led the study, noted that quilters tend to use high-quality, high-thread count cotton. The best homemade masks in his study were as good as surgical masks or slightly better, testing in the range of 70 to 79 percent filtration. Homemade masks that used flimsier fabric tested as low as 1 percent filtration, Dr. Segal said.

The best-performing designs were a mask constructed of two layers of high-quality, heavyweight “quilter’s cotton,” a two-layer mask made with thick batik fabric, and a double-layer mask with an inner layer of flannel and outer layer of cotton.

Bonnie Browning, executive show director for the American Quilter’s Society, said that quilters prefer tightly woven cottons and batik fabrics that stand up over time. Ms. Browning said most sewing machines can handle only two layers of fabric when making a pleated mask, but someone who wanted four layers of protection could wear two masks at a time.

Ms. Browning said she recently reached out to quilters on Facebook and heard from 71 people who have made a combined total of nearly 15,000 masks. “We quilters are very much in the thick of what’s going on with this,” said Ms. Browning, who lives in Paducah, Ky. “One thing most of us have is a stash of fabric.”

People who don’t sew could try a folded origami mask, created by Jiangmei Wu, assistant professor of interior design at Indiana University. Ms. Wu, who is known for her breathtaking folded artwork, said she began designing a folded mask out of a medical and building material called Tyvek, as well as vacuum bags, after her brother in Hong Kong, where mask wearing is common, suggested it. (DuPont, the maker of Tyvek, said in a statement that Tyvek is intended for medical apparel, not masks.) The folded mask pattern is free online, as is a video demonstrating the folding process. In tests at Missouri University and University of Virginia, scientists found that vacuum bags removed between 60 percent and 87 percent of particles. But some brands of vacuum bags may contain fiberglass or are harder to breathe through than other materials, and shouldn’t be used. Ms. Wu used a bag by EnviroCare Technologies, which has said it does not use fiberglass in its paper and synthetic cloth bags.

“I wanted to create an alternative for people who don’t sew,” said Ms. Wu, who said she is talking to various groups to find other materials that will be effective in a folded mask. “Given the shortage of all kinds of materials, even vacuum bags might run out.”

The scientists who conducted the tests used a standard of 0.3 microns because that is the measure used by the National Institute for Occupational Safety and Health for medical masks.

Linsey Marr, a Virginia Tech aerosol scientist and an expert in the transmission of viruses, said the certification method for respirators and HEPA filters focuses on 0.3 microns because particles around that size are the hardest to catch. While it seems counterintuitive, particles smaller than 0.1 microns are actually easier to catch because they have a lot of random motion that makes them bump into the filter fibers, she said.

“Even though coronavirus is around 0.1 microns, it floats around in a wide range of sizes, from around 0.2 to several hundred microns, because people shed the virus in respiratory fluid droplets that also contain lots of salts and proteins and other things,” said Dr. Marr. “Even if the water in the droplets fully evaporates, there’s still a lot of salt and proteins and other gunk that stays behind as solid or gel-like material. I think 0.3 microns is still useful for guidance because the minimum filtration efficiency will be somewhere around this size, and it’s what NIOSH uses.”

ABLE TO DO ROLLING TESTS ON MATTRESSES

DURABILITY TEST FOR THE BED SURFACE:
1. USES INDEPENDENT CONTROL SYSTEM. PLC CONTROL SEPARATELY. COOPERATE WITH COLOR TOUCH SCREEN. IT IS
CONVENIENT AND VISUAL TO OPERATE. THE TESTING PROCESS AND THE RUNNING STATUS BE CLEAR TO US, TEST TIMES CAN
BE SET FREELY.
2. SPECIAL LIFT DEVICE IS CONVENIENT TO LIFT UP THE HEAVY ROLLER AND EASY TO MOVE IT TO THE TEST AREA OF THE
MATTRESS. THEN PUT DOWN THE ROLLER AND MAKE ITS OWN WEIGHT FULLY LOAD TO THE SURFACE OF THE MATTRESS.
3.ROLLER CAN MOVE UP AND DOWN IN THE TESTING PROCESS, TO ADAPT TO CONCAVE AND CONVEX SURFACE OF THE
MATTRESS.
4. WHEN DOING DURABILITY TEST OF EDGE, ROLLER CAN BE MOVED TO THE “PARKING” AREA BEHIND THE INSTRUMENT.
5. DURABILITY TEST FOR THE EDGE IS DRIVEN BY SERVO MOTOR; IT IS QUIET, STEADY AND RELIABLE TO OPERATE.
6. INCORPORATES ADVANCED PHOTOELECTRIC SENSE TECHNOLOGY. THE BEGINNING POSITION OF THE CENTER LINE OF THE
CUSHION SURFACE RETURN TO THE HOME POSITION AUTOMATICALLY.
DURABILITY TEST FOR BED EDGE :
ADOPT INDEPENDENT CONTROL SYSTEM, USING DEDICATED HIGH-PRECISION AND HIGH INTELLIGENT ARAM CONTROLLER
AND SPECIAL TEST SOFTWARE. IT CAN RUN UNDER WINDOWS SYSTEM ON PC, IT IS OPERATED ALL BY SOFTWARE, THE
INTERFACE OF SOFTWARE IS EASY TO OPERATE.
SPECIAL TEST SOFTWARE ON PC, WINDOWS OPERATING PAGE, A HIGH DEGREE OF COMPATIBILITY.
TEST PROGRAM HAS ALREADY BEEN SET ON THE SOFTWARE ON PC ACCORDING TO THE TEST REQUIREMENT. A KEY TO TEST.
IT IS CONVENIENT FOR OPERATOR TO LEARN AND SAVE THE TRAINING TIME.
THE CURVE WINDOW OF TEST SOFTWARE DISPLAY THE VALUES OF FORCE AND SHIFT IN REAL TIME, COORDINATE MODEL.
LOADING CUSHION ON THE EDGE AND LOADING CUSHION WHICH IS USED FOR MEASURING USE GENERIC CONNECTION
HEAD THAT CAN BE IN INTERCHANGED. SHARING A SET OF DRIVING DEVICE, SAVE SPACE AND COST.
ADJUSTABLE RACK. THE PRESSURE PLATE CAN BE ADJUSTED THE POSITION ALONG THE DIRECTION OF X AND Y. IT CAN
MEASURE EACH POINT OF THE MATTRESS. IT IS DIFFERENT FROM THE TRADITION WAY TO SEPARATE. THE TEST CAN BE
FINISHED WITHOUT MOVING THE SAMPLE.
SAVE A LOT OF TESTING TIME, GREATLY REDUCES THE WORKING INTENSITY, OPERATORS CAN ACHIEVE SINGLE OPERATION,
SAVE THE COMPANY COST.
FORCE SENSOR AVOIDS DAMAGE TO THE CORE COMPONENTS BECAUSE IT CAN MAKE PROTECTION WHEN IT IS OVERLOAD.

ROLLING TEST SPEED: 16±2CYCLES PER MINUTE (OR SPECIFIED BY CUSTOMER)
CYLINDER ROLLER: 1400N, THE MIDDLE DIAMETER: 300mm, BOTH ENDS DIAMETER: 250mm, LENGTH: 1000
HEXAGON STYLE WOODEN ROLLER: SIZE AS STANDARD REQUIREMENT
COUNTER: 0~999999 CAN BE SET.
THE CONTROL WAY OF ROLLING: TOUCH SCREEN + PLC CONTROL
LOADING CUSHION ON THE EDGE: BUTTOCKS SHAPE, 380mm X 495mm
LOADING PARTS ON THE EDGE: THE MIDPOINT ON THE LONG EDGE OF THE MATTRESS.200 mm FROM EDGE.
LOADING FORCE ON THE EDGE: 1000N
LOADING TIME ON THE EDGE: 3S
POSITION OF MEASUREMENT: MATTRESS CENTER, LEFT AND RIGHT ARE BOTH 250mm, THE MIDPOINT ON THE LONG EDGE
OF THE MATTRESS 200 mm INWARD.
LOADING PLATE OF MEASUREMENT: DIAMETER 355mm, RADIUS OF CURVATURE OF THE END R800mm
CAPACITY OF FORCE SENSOR: 2KN
LOADING SPEED OF MEASUREMENT: 90±5mm/MIN
STROKE: 500mm
DRIVE MOTOR: SERVO MOTOR

I. FUNCTION
THE MACHINE IS FULLY AUTOMATIC EAR TO LOOP MASK MAKING MACHINE. THIS MACHINE INCLUDES ONE SET OF CS-175 AND 2 SETS CS-WD175 AND BY A UNIT OF AUTOMATED DISPENSER. MASK BODIES PRODUCED ON THE MASK MACHINE CAN BE ALLOCATED ONTO 2 SETS OF SUBSEQUENT MACHINES CONTROLLED BY PLC AT THE SPEED OF 0 TO 120 PIECES PER MINUTE. ALL OF OPERATIONS OF THE MACHINE ARE CONTROLLED THROUGH TOUCH SCREEN OR PLCS.
II. PROCESS
AFTER THE MACHINE MAKES THE MASK BODY, THE CONVEYOR BELT STRUCTURE TRANSPORTS THE MASK BODY PIECE TO THE CONNECTING CONVEYOR. THROUGH THE CONNECTION CONVEYOR MASK PLATE TO THE CONVEYOR BELT, AGAIN THROUGH THE CONVEYOR BELT THE MASK IS TRANSPORTED TO THE EAR PIECE SECTION TO THE FRONT OF THE MACHINE ABOVE THE FIRST MASK PLATE, FINALLY THROUGH THE CYLINDER DOWN THE MASK ONTO MASK EAR MACHINE DISC, FOLLOWED UP BY EAR MASKS FOR THE EARS OF THE BELT WELDING MACHINE AND THEN IT’S COMPLETE.
III. FEATURES:
1. MACHINE FRAME IS MADE OF ALUMINUM ALLOY, PREVENTED FROM RUST;
2. THE MACHINE CAN MAKE 1 TO 3 TYPES OF MASK BLANKS ACCORDING TO WHAT THE CUSTOMER REQUIRES.
3. THE SIZE OF THE MASK BLANK AND THE FOLDING LOCATION CAN BE ADJUSTED;
4. THE DIRECTION OF THE EAR LOOP IS OUTSIDE;
5. A COMPUTER PROGRAM CONTROL AND PHOTOELECTRIC DETECTION ACHIEVES A HIGH RELIABILITY AND LOW FAILURE RATE.

REFERENCE NUMBER: L-5737

LAUNDEROMETER

FOR ALL KINDS OF COTTON, WOOL, HEMP, SILK, CHEMICAL FIBER AND OTHER TEXTILES

STANDARDS: GB/T3921.1, GB/T3921.5, ISO105 D01, ISO105 C01, ISO105

C05, ISO105 D01, ISO105, BS1006, GB/T5711, JIS L 0844, JIS L 0860, AATCC 61

TOUCH SCREEN DISPLAY

QUANTITY: 1