References & Test Results

1. Air quality analysis during full operation of ENC by the independent professional lab
The Occupation Safety and Health Administration (OSHA) of The United States Department of Labor has set Permissible Exposure Limits (PELs) to protect workers against the health effects of exposure to hazardous substances. PELs are regulatory limits on the amount or concentration of a substance in the air. OSHA PELs are based on an 8-hour time weighted average (TWA) exposure. An independent professional lab in Calgary had performed three air-quality inspections for our ENC shop during full operation. The results indicated that the possible air contaminants during our ENC operation were far below the PELS.


Soluble Nickel


Alkaline Dust as NaOH (mg/m3)

Hydrochloric Acid






Inspection Results




 2. Oven Exposure + Autoclave Testing of InnoGUARD 300
Oven Exposure

Exposure at 340°C/644°F for two hours + Cooling at room temperature for one hour.

Autoclave Testing

250°C/482°F, 13.8MPa/ 2000 psi, 1.5% sodium chloride (NaCl) solution (60%)+ CO2 (40%), 12~13 hours.                                                 


                       Metallographic Image of Harber EN-300                                 Metallographic Image of Competitor's ENC Sample          
                         (No blisters, cracking or delamination)                                                              (Severe Cracking)


3. Torque Testing of Harber EN-300

Pup joints and couplings are used for drilling operation always experience high torque during service. The threads on pup joints and couplings then suffer severe wear and the resultant premature failure. Harber EN-300 coatings were applied onto the external and internal surfaces of pup joints and couplings. These coated parts were then tested under in-field high-torque conditions. Destructive torque testing was also performed to test the integrity of coatings.

In-field two-cycle torque testing

 Wholely-coated pup joints and couplings after two-cycle torque testing
                                                                                                                                                                   Coated threads after two-cycle torque testing
Coated internal threads after two-cycle torque testing

Metallographic image of coated threads after testing
(Excellent bonding, no cracking and delaminating.) 

Destructive Torque Testing
Damaged coated threads by destructive torque testing

Indentations in the coated surface by fixtures (No cracking or flaking; excellent toughness and ductility.)
Metallographic image of damaged coated thread (No cracking and delaminating of coating; excellent bonding.)