About MACHBLOC™ HVOF Masking Compound

MACHBLOC™ HVOF masking compound was developed to withstand the rigors of the HVOF plasma spray environment.  MACHBLOC™, in the uncured state, is a soft, conformable putty-like material. MACHBLOC™ is great for masking holes, grooves, key slots or any unique configuration for both plasma spray and HVOF processes.  Once cured MACHBLOC™ becomes a strong, abrasion-resistant mask allowing users to take full advantage of HVOF coating technology.



MACHBLOC™ features include:

  • Extruded profiles easily fill holes, grooves etc.
  • MACHBLOC™ is instant, flexible, and economical, allowing for quick turnarounds on small or large runs.
  • Halogen & chloride free for aviation applications.


Maximum Temperature     
Continuous use - 625 F degrees
Peak - 900 F degrees

Cure Cycle    
25 minutes @ 250 F

50 lbs/cubic ft

Free Chlorides   
< 1 PPM

Free Halogens     
< 1 PPM

Cured Tensile Strength (3 mm thick)     
6.9 MPa

Hardness (Shore A)     

Shelf Life   
6 months @ 72 F in sealed container


Although the specifications given above are true to the best of our knowledge, Tapeworks does not warrant this product to be suited to any particular user application. Tapeworks recommends that each user test MACHBLOC™ under the conditions of their particular application to determine its suitability.

MACHBLOC™ is a trademark of Cortape NE, Inc. doing business as Tapeworks.