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# YY/T 0691-2008 (YY/T0691-2008)

 Standard ID Contents [version] USD STEP2 [PDF] delivered in Name of Chinese Standard Status YY/T 0691-2008 English 210 Add to Cart 0--3 minutes. Auto-delivery. Clothing for protection against infectious agents. Medical face masks. Test method for resistance against penetration by synthetic blood (fixed volume, horizontally projected) Valid

YY/T 0691-2008: PDF in English (YYT 0691-2008)
If the density of the liquid is known, the volume of the ejected liquid is easier to measure by measuring the mass of the liquid and calculating it according to formula (B.9).
In the formula.
Q --- the volume of liquid ejected;
ρ --- the density of the test liquid.
If the density of the test liquid is 1.005 g/cm3, the spray volume of 2 mL should be 2.010 g.
B. 8 Need attention, such as B. 2c), formula (B.8) and Table B. The liquid velocity in 2 is assumed to be constant throughout the ejection process.
This assumption is valid for the case where the ejection distance is only the thickness of the blood vessel wall. But for this test device, blood flows through a long tube,
Passing through the valve and spray head, friction creates resistance during this process. Therefore, when the pressure in the container is kept constant,
It takes about 0.1s to descend to a steady state flow. This situation can be observed by observing the position where the sprayed liquid reaches the sample.
Measured. The place where the initial spray was made was more than 1 cm higher than the position where the steady-state liquid was sprayed.
YY/T 0691-2008/ISO 22609..2004
Using this change in spraying position in the height direction, it is possible to place a small hole (aperture 0.5cm) between the spraying head and the mask.
Set the target plate and let only steady state liquid be sprayed onto the mask sample. If you adjust the spray direction, only let the steady-state liquid pass through the small holes on the target plate.
The body will be blocked by the plate, and it sprays above the small hole of the target plate.
From equations (B.7) and (B.9), equation (B.10) can be obtained to estimate the steady-state liquid flow rate.
In the formula.
Equation (B.10) can be rewritten into the form of Equation (B.11).
(B.11)
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[2] BARACH, P. G. , CULLEN, B. F. anandstoeting, R. K. HandbokorClinicaAnneste-
sia, J. B. Lippincott Co. , Philadelphia (1994) Appendix A.
[3] TELFORD, G. L. and ZUEBBEMAN, E. J. AssassinityRiskoffBloodExposureinop
EroticRom, AmericanJounalofInformationControl, (21/6) December.1993, p. 351-356.
tioneBySystemBlood (HorizontalProfessionalFileFollowVolumeAtaKnownVelocity).
tiofofisistanceoffrectecivelcopyingclosing chronological datapointing network traversing data collection data collection-floods-test
metdusching syndrome.
[6] ISO 16604, Cloning for Proceedings, Internet, Consignment, Broadcasting, Broadcasting, and Florida-Department-