Technical Bulletins

Overview
eStrip® blast abrasive products are classified as USAF Type VII starch-g-acrylic medias. Manufactured with a grafted starch-acrylic copolymer, eStrip blast abrasives are produced to meet the USAF MIL-P-85891 requirements. eStrip expands the scope of military dry stripping applications for both aluminum and composite aircraft structures. While similar to plastic abrasives in many respects, eStrip series media enable a better stripping performance without undue risk of substrate damage. ADM’s starch-g-acrylic product is offered as eStrip GPX. This engineered blast abrasive combines the best features of both plastic and starch abrasives:

  1. Fast strip rate
  2. Low breakdown rate
  3. Low surface effects on aluminum and composites.  
eStrip GPX’s moisture resistance and good flowability allow it to be used in all plastic abrasive blasting systems. Important post-stripping advantages include:
  1. eStrip GPX high UV fluorescence greatly enhances the ability to detect residual media
  2. eStrip GPX remaining dust/residue can be removed with water to provide a clean, ready to paint surface – no chemicals or chemical wipes required (i.e. MEK solvent wipe is not required).   
Media Management
Extensive production experience has shown that a broad particle size range in the working media mix provides eStrip GPX’s optimum performance. Operators can manually replenish blast systems with new media (i.e. adding new media to the production mix) on a regular basis. Or, the blast equipment can be designed to replenish automatically at regular intervals. In order to achieve optimum performance, it is recommended that new media be fed into the production mix often and in small amounts.

eStrip GPX are ideal for Metal and Composite surfaces

This molecularly engineered starch-g-acrylic media is offered in two different versions.  eStrip GPX are available in one standard mesh size, 20/50, as specified in the USAF MIL-P-85891 requirement. Product Data Sheets for each media are available.

eStrip GPX is a hybrid corn starch and acrylic plastic based product which exhibits mechanical properties similar to starch abrasives but performance characteristics similar to Mil Spec approved plastic media. It is suitable for metallic and composite substrates.

Process Equipment
eStrip GPX media can be used in standard, light abrasive, blast equipment. The enhanced flowability, faster stripping rates, and low breakdown make it a simple drop-in replacement for plastic media. eStrip GPX can be used in hand-cabinets, blast rooms and in full-scale (hangar) aircraft depaint operations. ADM can assist you in equipment selection and specification.

Safety Precautions
Contaminants from Coatings Removed

The paint or coating material being removed may contain hazardous ingredients such as chromium, lead, or cadmium metals. Since such contaminants become part of the corn polymer media dust waste, the dust waste material may be hazardous to personnel and the environment.

Users should investigate and fully understand the applicable safety regulations and environmental laws concerning dust contamination and exposure. User personnel and the working environment should be protected with the appropriate personnel protection and engineering controls.

Explosibility Data
Independent studies have investigated the ignition properties of eStrip starch-g-acrylic media and determined that eStrip media are not explosible. eStrip products cannot be ignited. Only the fine dust produced from the breakdown of these products after blasting is ignitable at a given concentration in the presence of a high-energy source.

The overall conclusion, based on a hazard assessment performed by an independent research laboratory (Chilworth Technology, Inc.), clearly shows that eStrip starch-g-acrylic media and its corresponding dust is less hazardous than Type V plastic media. The equipment recommendations used for light abrasives, such as plastic media, are more than sufficient for the eStrip media dry stripping process.

Technical data on the ignition characteristics of eStrip GPX media can be obtained from ADM upon request.

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