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COATINGSPRO SURFACE PREP 2017 13 T here are a variety of blast media options, and each option offers different benefits for the particular project and substrate. In addition to garnet and steel, there's also glass, alumi- num oxide, and even sponge. Other ty pes of equipment can be used on steel and concrete substrates. For areas that are smaller, or on projects where larger equipment can't be used, hand or power tools may be the best solution. Precise Measurements It is not enough for contractors to create an anchor profile on the substrate; it must be determined that the correct surface profile was achieved. A fter a steel substrate is abrasive blasted, the peak-to-valley height of the resultant surface profile is an important factor in the performance of applied protective coatings. A low profile may reduce coating bond strength (adhesion). Too high of a profile and the peaks may receive insufficient coverage and possibly corrode prema- turely. T he costly application of additional coating may be required if the profile is too high. For these reasons, surface profile should be measured prior to coating application to ensure that it meets contract specifications. DeFelsko is one company that offers instruments for measuring surface profile. "DeFelsko manufactures two instruments for conforming to ASTM D4417: Standard Test Methods for Field Measurement of Surface Prof ile of Blast Cleaned Steel: the PosiTector SPG Surface Profile Gage, a depth micrometer fitted w ith a fine pointed probe, and the PosiTector RTR Replica Tape Reader, a digital spring micrometer," said R ichard Northrup of DeFelsko. According to Northrup, replica tape is simple, relatively inexpensive, and one of the most popular field methods for measuring surface profile. Replica tape consists of a layer DryCo Equipment manufacturer Downers Grove, IL 60515 (866) 672-4628 Equipment Development Co., Inc. (EDCO) Equipment manufacturer Frederick, MD 21702 (800) 638-3326 Elcometer Inc. Equipment manufacturer Rochester Hills, MI 48309 (248) 650-0500 Flow International (AquaFlow) Equipment manufacturer Kent, WA 98302 (253) 850-3500 General Equipment Equipment manufacturer Owatonna, MN 55060 (800) 533-0524 GMA Garnet (USA) Corporation Material manufacturer The Woodlands, TX 77380 (832) 243-9300 HoldTight Material manufacturer Houston, TX 77227 (800) 319-8802 Hotsy by Kärcher North America Equipment manufacturer Camas, WA 98607 (800) 525-1976 For steel substrates, thickness gages, such as DeFelsko's PosiTector, can be used to measure the profile height, a very important aspect of surface prep. Too high or too low can be problematic. VENDOR TEAM International Concrete Repair Institute (ICRI) Education St. Paul, MN 5514 (651) 366-6095 Jenny Products, Inc. Equipment manufacturer Somerset, PA 15501 (814) 445-3400 Jetstream of Houston, LLP by Federal Signal Corporation Equipment manufacturer Houston, TX 77041 (800) 231-8192 jetstream Madaco Safety Products Inc. Safety equipment manufacturer Walnut, CA 91789 (909) 614-1756 Marco Equipment manufacturer Davenport, IA 52803 (800) 252-7848 Mi-T-M Equipment manufacturer Peosta, IA 52068 (563) 556-7484 Monarflex Equipment manufacturer Irving, TX 75062 (800) 922-8800 NACE International Education Houston, TX 77084 (281) 228-6200 Surface Preparation

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