The fluid or blood resistance and breathability level of a face mask is measured through pressure difference ∆P testing. This test is performed under the guidelines of ASTM F2100-19/EN 14683 standards. The units of differential pressure testing are expressed in mm H₂O/cm²/ Pa/cm². In this article, we will explore face mask pressure difference testing.
What Is Face Mask Pressure Difference Testing?
Role of Differential Pressure in Medical and Surgical Masks
The airflow resistance across the mask material is determined through face mask pressure difference testing. The differential pressure (∆P) value, which is expressed in Pa/cm², defines how easily a person can breathe through the mask.
Surgical masks are made in such a way that they must balance filtration and breathability according to EN 14683 and ASTM F2100-19 standards.
For example, a Type IIR surgical mask must have a ∆P ≤ 60 Pa/cm² according to EN 14683 standard, and ASTM Level 2 masks must be ≤ 5.0 mm H₂O/cm².
Importance of Breathability in Disposable Medical Masks and Children’s Surgical Masks
The breathability of masks impacts the user comfort and compliance. It is more important in the case of long wear times. Children’s masks must have lower pressure differences for easy breathing due to their smaller lungs.
For example, if a child’s surgical mask has a pressure difference (∆P) of 28 Pa/cm², then it means air can pass easily from the mask, comfortable for breathing and also offers good protection.
The facemask pressure difference tester ensures the mask’s compliance and consistency in manufacturing. It makes sure that the face mask meets the safety and comfort standards.
Testing is very important for places such as hospitals, schools, and PPE suppliers to ensure the mask quality and safety. This type of reliable testing helps manufacturers to produce consistent, high-quality masks that are safe and comfortable for long wearers.
Understanding ASTM F2100-19 and EN 14683 Standards
ASTM F2100-19 describes masks breathability using the ΔP pressure difference. The lower ΔP means the mask has easy breathing ability, and it ensures the wearer’s comfort. EN 14683 classifies limits in Pa/cm².
According to ASTM F2100-19 Level 1 mask allows 5.0 mm H₂O/cm², and Levels 2 & 3 allow up to 6.0 mm H₂O/cm², while the EN 14683 standard classifies the masks as Type I & II ≤ 40 Pa/cm², Type IIR ≤ 60 Pa/cm².
Pressure Difference Criteria in ASTM Level 1, 2, and 3 Surgical Masks
The ASTM F2100-19 standard classifies the surgical masks into 03 levels depending on their comfort and breathability using the parameter differential pressure ΔP. The value of ΔP tells how easily air can pass through the mask.
Level 1 : ≤ 5 mm H₂O/cm
The level 1 masks are used where minimal risk of fluid splashes or sprays. It allows a maximum pressure differential 5.0 mm H₂O/cm. Level 1 mask is comfortable and breathable for long-term use with basic protection due to a low ΔP value.
Level 2: ≤ 6 mm H₂O/cm
This type of mask is used where moderate risk of fluid splashes, such as blood draws or in emergency rooms. It allows a maximum pressure differential 6.0 mm H₂O/cm which is higher than Level 1, still breathable with better fluid protection.
Level 3: ≤ 6 mm H₂O/cm
This type of mask is used in high-risk environments where heavy exposure to blood or body fluids like in surgeries. It has strong fluid protection while maintaining good breathability. It also allows maximum pressure differential up to 6.0 mm H₂O/cm.
Example
Level 1 mask is used where wearers do not deal with blood or fluids, like a hospital receptionist may use it for long hours. Level 3 mask is used where is a high chance of fluid splashes. For example, a surgeon in the operating room will wear a mask level 3.
EN 14683 Pressure Drop Requirements for Type I, II, and IIR Masks
The EN 14683 standard uses Pa/cm² unit for pressure difference.
Type I & II: ≤ 40 Pa/cm²
It has the maximum pressure difference 40 Pa/cm². It is comfortable for daily use in hospitals or public places with low to moderate fluid risk.
Type IIR (fluid-resistant): ≤ 60 Pa/ cm²
It is used in medical places where there is a risk of blood or fluid splashes. The Type IIR mask is highly fluid-resistant, with a maximum pressure differential up to 60 Pa/ cm². It is breathable with protection against fluids and ideal for surgical settings.
Why Pressure Difference Testing Matters in Quality Control?
Why Pressure Difference Testing Matters in Quality Control?Balancing Filtration Efficiency with Comfort and Breathability
The differential pressure ΔP testing measures how easily air can pass through the mask while maintaining the air filtration and protection from fluids.
The level 1 mask allows 5.0 mm H₂O/cm², and Level 2 & 3 have the maximum limit of 6.0 mm H₂O/cm² according to ASTM F2100-19 standard. Face mask pressure difference testing ensures that the wearer does not feel suffocating even when wearing a high-protection mask for a long time.
Ensuring Safety and Compliance in Modern Mask Production
The ΔP testing ensures the compliance and comfort level for facemasks and helps manufacturers to produce masks with consistent quality. The purpose of a mask is not just to filter the particles, but it should also be breathable.
The face mask pressure difference tester is widely used to ensure the mask quality according to ASTM F2100-19, and EN 14683:2014 standards. The reliable ΔP test results ensure that health care staff can wear the mask for a longer time without discomfort.
EN 14683 Pressure Drop Requirements for Type I, II, and IIR Masks
The EN 14683 standard defines the breathable limits for masks. For Type I and II the limit is ≤ 40 Pa/cm². Type IIR which is fluid-resistant has limit up to 60 Pa/cm².
For example, type IIR mask is suitable for surgical use which gives protection form blood or fluid and as well as breathable with comfort for longer time.
Conclusion
Face masks are tested through differential pressure tester, which measures the ∆P. The ΔP testing ensures the compliance and comfort level for facemask and helps the manufacturers to produce masks with consistent quality.
Face mask pressure difference tester is widely used to ensure the mask quality according to ASTM F2100-19, and EN 14683:2014 standards. The reliable ΔP test results ensure that health care staff can wear the mask for longer time without discomfort.
FAQs
What Is Face Mask Pressure Difference Testing?
The airflow resistance across the mask material is determined through face mask pressure difference testing. The differential pressure (∆P) value which is expressed in Pa/cm², defines how easily a person can breathe through the mask.
What are the (∆P) values for face mask according to ASTM F2100-19?
According to ASTM F2100-19, the level 1 mask allows 5.0 mm H₂O/cm² and Level 2 & 3 has the maximum limit for to 6.0 mm H₂O/cm².
What are the limits for Type I, II, and IIR Mask according to EN 14683 standard?
The EN 14683 standard defines the breathable limits for masks. For Type I and II the limit is ≤ 40 Pa/cm². Type IIR which is fluid-resistant has limit up to 60 Pa/cm².
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