Verification Testing

Cleanliness Verification Testing Services

A critical step in the precision cleaning process is cleanliness verification testing, which ensures that cleaned parts and components meet the determined cleanliness level as noted in the specification. Our proprietary process, equipment and facility allows us to attain low cleanliness levels of the IEST STD CC1246E Specification.

To ensure cleanliness, we verify levels using optical particle counters and gravimetric NVR equipment, photoionization detectors for solvent detection and dryness verification and digital dew-point meters for water dryness verification. Additionally, we use fume hoods, laminar flow hoods, and a complete wet chemistry laboratory for research and development which complements the cleaning and testing services.

Whether cleaning and confirming particulate levels, non-volatile residue levels, or other contamination limits, Astro Pak is expertly equipped to meet your precision cleaning and verification needs. We also routinely consult and perform projects that require highest cleanliness levels. 

Table 2. Nonvolatile residue cleanliness levels
Level (μg/cm2 or μg/0.1cm3) Former Designation Level Maximum allowable NVR limit mass / 0.1 m2 or mass / 0.1 L
R1E-5 AA5 10 ng
R2E-5 AA4.7 20 ng
R5E-5 AA4.3 50 ng
R1E-4 AA4 100 ng
R2E-4 AA3.7 200 ng
R5E-4 AA3.3 500 ng
R1E-3 AA3 1 μg
R2E-3 AA2.7 2 μg
R5E-3 AA2.3 5 μg
R1E-2 A / 100 10 μg
R2E-2 A / 50 20 μg
R5E-2 A / 20 50 μg
R1E-1 A / 10 100 μg
R2E-1 A / 5 200 μg
R5E-1 A / 2 500 μg
R1 A 1 mg
R2 B 2 mg
R3 C 3 mg
R4 D 4 mg
R5 E 5 mg
R7 F 7 mg
R10 G 10 mg
R15 H 15 mg
R25 J 25 mg

Testing Methods

  • Components & Hardware
  • Valves (Relief, Ball, Butterfly, Needle, Gate, etc)
  • Gauges (Pressure, Flow meter, Hydraulic, Cryogenic)
  • Fittings, Fasteners
  • Filters & Filter Housings
  • Transducers & Sensors
  • Equipment or sub-systems
  • Oxygen & Critical Gas / LOX Tubing and Componentry
  • Laser & Optics Componentry
  • Hydraulic componentry
  • Medical devices
  • Aircraft, Space and Military Componentry
  • Heat Exchangers
  • Pipe, Tubing and Hoses
  • Spools, Flanges, Gaskets
  • Tanks, vessels
  • Manifolds
  • Miscellaneous Assemblies
  • Laser
  • Aerospace, Military & Defense
  • Oil & Gas
  • Medical Devices
Lab Technician I

Particle Count

measures the numbers and sizes of particles remaining on the surface.

Downey Cleanroom - Cleaning

Non-Volatile Residue (NVR)

The measurement of residues, which are mostly oils and greases, which remain on the cleaned surface.

Solvent Cleaning

Total Filterable Solids (TFS)

Similar to a Particle Count, we collectively weigh to determine the total mass using the same precision analytical microbalance used in the NVR measurement.

Downey Cleanroom CR


This measurement is capable of detecting trace amounts of moisture and quantifying them, allowing us to determine the exact state of dryness of the hardware, assuring that no excess moisture remains.

Halogen Gas Detector

Solvent Removal

This is the assurance that no solvent remains behind after the cleaning and contaminant extraction processes are completed.

Ultraviolet Light Inspection Astro Pak

Ultraviolet Light Inspection

Used to certify the residue cleanliness of a critical surface in instances where no fluid may touch the surface. It can also be used as a supplemental test.

Table 1.  Particulate Cleanliness Levels

IEST-STD-CC1246E Level (Maximum Particle Count)
min (μm) max (μm) 25 50 100 200 300 400 500 750 1000
5 15 19 141 1519
15 25 2 17 186 2949
25 50 1 6 67 1069 6433
50 100 0 1 9 154 926 3583 10716
100 250 0 0 1
(Note 3)
92 359 1073 8704
250 500 0 0 0 0
(Note 3)
(Note 3)
25 205 983
500 750 0 0 0 0 0 0 1 7 33
750 1000 0 0 0 0 0 0 0 1 3
1000 1250 0 0 0 0 0 0 0 0 1

Note that particles are counted down to a size of five μm, which cannot be seen with the unaided eye. This entire process is termed a particle count.

Trust the Experts

Astro Pak Corporation has over 60 years of experience in cleaning and packaging precision clean hardware. Whether its small components or huge vessels we can clean it all! Our packaging services also meet the requirements of literally hundreds of industry specifications. This includes aerospace contractors, ULA, NASA, the Department of Defense, and many private industries and organizations.

To ensure quality packaging of hardware, all plastic films are precision cleaned, tested for contaminants and certified prior to use. Our material is capable of protecting parts during transportation and handling, resistant to punctures and tearing. It is also free from generating contaminants such as particles from friction between the material itself and the part inside.

We provide cleanliness verification testing services at both of our CA and FL Cleanroom Services locations which are AS9100 certified and feature ISO 14644-1 Class 5, 6, or 7 cleanrooms and labs of varying sizes and capabilities. In addition to Cleaning and Packaging, we also allow customers to come onsite and assemble their own parts after cleaning.

Astro Pak commits to providing customers with the level of excellence they expect and deserve by:

  • Advanced Chemistry & Process Technology
  • Highly Trained Personnel delivering superior consulting services
  • Rapid Response
  • State of the Art Equipment and Locations Nationwide
  • Superior Documentation (Meeting cGMP Requirements)

Our Certification packages are QMS/cGMP compliant for your systems and equipment maintenance records.  Let our experienced and credentialed team of chemists, engineers, and other professionals on staff EXCEED your expectations. Contact us today for more information.