NPPTL COVID-19 Response: International Respirator Assessment

Manufacturer: AOK Tooling Limited (Shenzhonghai Medical Inc.)

Model Tested: 20180016

Date Tested: May 11, 2021

These findings pertain to the AOK Tooling Limited (Shenzhonghai Medical Inc.), model 20180016. The 

packaging and labeling indicate that it is a NIOSH-approved product, under approval number TC-84A8131. The packaging for this product also indicates that it meets T/CTCA 7-2019 (the Chinese standard

for Ordinary Protective Mask).

Ten respirators were submitted for evaluation. The samples were tested using the modified version of 

NIOSH Standard Test Procedure (STP) TEB-APR-STP-0059. This modified assessment plan can be found 

here. 

The maximum and minimum filter efficiency was 99.58% and 92.16%, respectively. Eight respirators 

measured more than 95% filter efficiency. Two respirators measured less than 95% filter efficiency.

This product has head bands/straps. While filter efficiency shows how well the filter media performs, 

users must ensure a proper fit is achieved.

This assessment is not a part of the NIOSH respirator approval process and will in no way lead to or 

preclude NIOSH approval through the official approval process. This assessment was developed as an 

assessment of the filter efficiency for those respirators represented as certified by an international

certification authority, other than NIOSH, to support the availability of respiratory protection to US 

healthcare workers due to the respirator shortage associated with COVID-19. Only particulate filter 

efficiency was assessed.

The results provided in this letter are specific to the subset of samples that were provided to NPPTL for 

evaluation.

These results will be used to update the CDC guidance for Crisis Capacity Strategies (during known 

shortages).
NPPTL COVID-19 Response: International Respirator Assessment

Evaluation of International Respirators

Test: Modified TEB-APR-STP-0059

Date Tested: May 11, 2021

Report Prepared: May 14, 2021

Manufacturer: AOK Tooling Limited (Shenzhonghai Medical Inc.)

Item Tested: 20180016

Country of Certification: China (T/CTCA 7-2019); USA (42 CFR 84)

Filter Flow Rate

(LPM)

Initial Filter 

Resistance 

(mmH2O)

Initial Percent 

Leakage

(%)

Maximum 

Percent Leakage

(%)

Filter Efficiency

(%)

1 85 15.4 6.13 6.13 93.87

2 85 18.4 7.84 7.84 92.16

3 85 17.2 2.32 2.32 97.68

4 85 14.4 0.79 1.02 98.98

5 85 15.3 2.95 2.95 97.05

6 85 16.1 1.07 1.07 98.93

7 85 18.8 2.33 2.33 97.67

8 85 18.0 0.46 0.46 99.54

9 85 17.8 0.38 0.42 99.58

10 85 17.7 3.71 3.71 96.29

Minimum Filter Efficiency: 92.16% Maximum Filter Efficiency: 99.58%

• The test method utilized in this assessment is not the NIOSH standard test procedure that is used for certification of 

respirators. Respirators assessed to this modified test plan do not meet the requirements of STP-0059, and 

therefore cannot be considered equivalent to N95 respirators that were tested to STP-0059. 

• Respirators tested may not be representative of all respirators with the same certification mark. NIOSH has no 

control over suppliers and distributors of respirators certified by other national or international parties.

• This assessment is not a confirmation that it conforms with any or all of its specifications in accordance with its 

certification mark. 

• This assessment was not a part of the NIOSH approval program. These results do not imply nor preclude a future 

approval through the NIOSH respirator approval program.

Pictures have been added to the 

end of this report.
NPPTL COVID-19 Response: International Respirator Assessment
NPPTL COVID-19 Response: International Respirator Assessment
NPPTL COVID-19 Response: International Respirator Assessment
NPPTL COVID-19 Response: International Respirator Assessment
NPPTL COVID-19 Response: International Respirator Assessment
NPPTL COVID-19 Response: International Respirator Assessment