AMPP CAS-2 flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

WFT formula

Wet film thickness equals dry film thickness divided by volume solids fraction. Example: 4 mils DFT at 50% VS requires 8 mils WFT.

Theoretical coverage

Coverage in square feet per gallon equals 1604 times volume solids fraction divided by DFT in mils.

Pot life

Maximum usable time after mixing a plural-component coating before viscosity rises or gelation occurs, preventing proper application.

Induction time

Required waiting period after mixing before application, allowing chemical reaction to initiate and improve coating performance.

Stripe coating

Brush or roller application to edges, welds, corners, and fasteners before full spray to ensure adequate dry film thickness at these areas.

Spray gun distance

Recommended 12–18 inches (30–45 cm) from surface, held perpendicular, to minimize overspray and achieve uniform film build.

Dew point rule

Surface temperature must be at least 5°F (3°C) above dew point during application and cure to prevent condensation and coating failure.

Loss factor

Fraction of coating lost to overspray, bounce-back, and equipment residue; practical coverage equals theoretical coverage times (1 minus loss fraction).

SSPC-SP 5/NACE No. 1

White metal blast cleaning: removal of all visible oil, grease, dirt, mill scale, rust, coating, and foreign matter, leaving a uniform gray-white surface.

SSPC-SP 10/NACE No. 2

Near-white blast cleaning: removal of all visible contaminants except random staining limited to less than 5% of surface area.

SSPC-SP 6/NACE No. 3

Commercial blast cleaning: removal of all visible contaminants except random staining limited to less than 33% of surface area.

SSPC-SP 7/NACE No. 4

Brush-off blast cleaning: removal of loose mill scale, rust, coating, and foreign matter, leaving tightly adherent material intact.

Anchor profile

Surface roughness created by abrasive blasting, measured per ASTM D4417; typical angular profile for high-performance coatings is 1.5–4 mils.

Bresle method

Salt contamination test per ISO 8502-6/9 using a patch and conductivity meter; typical immersion limit is ≤3 µS/cm or per specification.

Abrasive cleanliness

Requirement that blasting abrasive be free of oil, salt, and contaminants, specified by SSPC-AB 1, AB 2, or AB 3.

SSPC-SP 1

Solvent cleaning: removal of oil, grease, dirt, soil, salts, and contaminants by cleaning with solvent, vapor, alkali, emulsion, or steam.

SSPC-SP 3

Power tool cleaning: removal of loose mill scale, rust, and coating using power tools, leaving tightly adherent material.

SSPC-SP 11

Power tool cleaning to bare metal: removal of all visible contaminants using power tools, leaving a surface with a 1-mil minimum profile.

SSPC-PA 2 DFT

Dry film thickness measurement standard: average of three gauge readings within a 4-inch diameter area; average must meet specification.

80% DFT rule

SSPC-PA 2 requirement that no single spot DFT reading may be less than 80% of the specified minimum thickness.

Adhesion tape test

ASTM D3359 method for films under 5 mils, using pressure-sensitive tape and a lattice or X-cut pattern to assess adhesion.

Pull-off adhesion test

ASTM D4541 method for thicker films, using a portable pull-off adhesion tester to measure the force required to detach a dolly.

Holiday detection

Low-voltage wet sponge for films under 20 mils; high-voltage spark tester for thicker or immersion coatings, per NACE SP0188.

Environmental monitoring

Recording ambient temperature, surface temperature, dew point, and relative humidity at regular intervals during application and cure.

Solvent rub test

ASTM D5402 method using solvent-soaked cloth to evaluate cure degree by counting double rubs until coating softens or dissolves.

SSPC-VIS 1

Visual standard for surface preparation, using photographic references to compare blast-cleaned surfaces to specified cleanliness grades.

OSHA silica PEL

Permissible exposure limit for respirable crystalline silica is 0.05 mg/m³ as an 8-hour time-weighted average under OSHA 29 CFR 1910.1053.

Supplied-air respirator

NIOSH-approved Type CE respirator required for abrasive blasting per OSHA 29 CFR 1910.94 and 1910.134.

Confined space testing

Atmospheric testing for oxygen (19.5–23.5%), flammability (<10% LEL), and toxicity before entry and continuously during work.

VOC regulation

Volatile organic compound content limits set by EPA 40 CFR Part 59 and local air districts; coatings must meet regional VOC limits.

Hazard Communication

OSHA 29 CFR 1910.1200 requires Safety Data Sheets and labeling for all hazardous chemicals on site.

RCRA waste classification

Spent abrasive and coating waste may be hazardous under 40 CFR 261; determine waste classification before disposal.