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Surface Profile

surface roughness

User Options for Surface Roughness Compensation when Measuring Dry Film Thickness of Coatings on Metal Surfaces

Two standards address the use of non-destructive dry film thickness gages: ASTM D7091, Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals and SSPC-PA 2, Procedure for Determining Conformance to Dry Coating Thickness Requirements. Both address the need to compensate for substrate/surface conditions …

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surface profile steel

Surface Preparation of Steel Prior to Application of Thermal Spray Coatings

Introduction The installation of thermal spray coatings (TSC) or metalized coatings is becoming more common for protection of new and existing structural steel members on locks & dams, bridges, tanks and other industrial structures. While the installation of thermal spray coatings is typically more labor intensive and more costly than traditional liquid-applied coatings systems, the …

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KTA Podcast #5 – Surface Profile Measurement – Replica Tape Vs. Digital Depth Micrometer

This podcast covers measuring surface profile and discusses two fundamentally different methods for measuring profile. Panelists discuss some of the complications that may occur when using both methods on the same job. The video (YouTube) version of the podcast features a variety of hands on demonstration and instrumentation use. KTA Chief Operating Officer, Bill Corbett, addresses …

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Evaluating the Performance Characteristics of Abrasive Media

Abrasive blast cleaning is the process by which an abrasive media is propelled through hoses and a blast nozzle by means of compressed air. The abrasive exits the nozzle at a high rate of speed (velocities approaching 650 – 1,700 feet per second) and as it impacts the surface removes existing materials and imparts a roughness (surface profile). The abrasive used …

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surface profile pitted steel

Surface Profile Measurement Options on Rough/Pitted Steel Surfaces

Introduction Surface profile is defined as a measurement of the maximum peak-to-valley depth generated by abrasive blast cleaning and impact-type power tools. These operations effectively increase the surface area and provide an “anchor” for the applied coating system. The surface profile depth must be compatible with the total coating system thickness; typically, the thicker the …

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astm method c

Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C

What is Surface Profile and Why is it Necessary? Surface profile is defined as a measurement of the maximum peak-to-valley depth created by abrasive impingement against a surface during abrasive blast cleaning operations, or by an impact-type power tool. During abrasive blast cleaning, the mass of the abrasive and the velocity of the abrasive movement …

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jobsite surface cleanliness standards

The Importance of Preparing Jobsite Standards for Surface Cleanliness and Surface Profile Depth Prior to Production Operations

Introduction Surface preparation prior to coating installation is generally composed of two goals: achieving the minimum specified surface cleanliness, and achieving the specified range of surface profile (surface roughness). While these goals may be achieved in a single operation (e.g., by abrasive blast cleaning) or two separate operations (e.g., by water jetting or chemical stripping, …

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Measuring Peak Density Using Optical Grade Replica Tape  

Introduction Most industrial and marine protective coatings rely on a mechanical bond to the substrate to remain attached while in service. This bond is generally provided by a surface profile or anchor pattern that is imparted into the surface prior to application of the coating system and effectively increases the surface area of the substrate …

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sspc visual guide surface cleaning

Surface Cleanliness – Knowing When It’s Clean Enough to Coat

Using project specs and standards to achieve surface cleanliness before coating application is the focus of the newest installment in the PaintSquare Video Learning Center series. “Surface Cleaning” is one of 19 videos in the original instructional series, which explores multiple aspects of protective coatings work. “Surface Cleaning,” part of the PaintSquare Video Learning Center …

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