AMPP CCAS flashcards

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

SSPC-SP 5

White metal blast cleaning standard; removes all visible rust, mill scale, coating, and foreign matter, leaving a uniform gray-white surface. It is the highest SSPC abrasive blast cleanliness grade.

SSPC-SP 10

Near-white blast cleaning standard; permits only very light staining on no more than 5% of each unit area, with all visible contaminants removed. It is commonly specified for industrial coatings.

Bresle method

Field test for soluble salts using a patch, injection of test solution, extraction, and conductivity measurement. Results are converted to chloride or total salt concentration per unit area.

Dew point rule

Abrasive blasting and coating application require steel temperature at least 3°C (5°F) above the dew point, unless the product data sheet sets a stricter limit.

Replica tape

ASTM D4417 Method C surface-profile test. Tape is pressed onto blasted steel, and the compressed foam thickness is measured with a spring micrometer to estimate peak-to-valley profile.

ISO Sa 2½

Near-white blast cleaning grade in ISO 8501-1. It removes all visible oil, grease, dirt, mill scale, rust, and coating, leaving only very light staining.

Compressed-air cleanliness

ASTM D4285 test directs blast air at a white cloth for a set time. Oil or water contamination appears as discoloration or droplets and must be corrected before blasting or coating.

Volume solids

Fraction of a coating that remains as dry film after solvent evaporation. It is used to calculate wet-film thickness and theoretical coverage from the product data sheet.

Wet-film thickness formula

WFT = DFT ÷ volume-solids fraction. For example, a 5 mil DFT coating at 50% volume solids requires 10 mils wet-film thickness.

Zinc-rich primer

Primer containing high metallic zinc loading that protects steel cathodically, especially at scratches and edges. It normally requires a clean, blasted surface and compatible topcoat.

Amine blush

Surface bloom on amine-cured epoxy caused by moisture and carbon dioxide reaction. It can reduce intercoat adhesion and must be removed before topcoating.

Aliphatic polyurethane

Topcoat resin known for good color and gloss retention under ultraviolet exposure. It is often used over epoxy intermediate coats in atmospheric service.

Recoat window

Product-data-sheet time interval during which the next coat may be applied without surface treatment. Exceeding it may require abrasion or another specified treatment for adhesion.

Pot life

Usable working time after mixing a reactive coating. It shortens as temperature rises and ends when viscosity increases enough to prevent proper application.

Airless spray overlap

Each spray pass should overlap the previous pass by about 50% to produce a uniform film and avoid streaks. Gun is held perpendicular to the surface at the recommended distance.

Plural-component pump

Metering and mixing equipment that combines resin and hardener at a fixed ratio. Ratio verification, solvent purge, and pot-life control are critical to cure and performance.

Stripe coat

Additional coat brushed or sprayed along edges, welds, corners, and back sides of structural members. It builds film where spray tends to thin and where corrosion often starts.

HVLP spray

High-volume, low-pressure spray method that improves transfer efficiency and reduces overspray. It requires adequate atomizing air and correct fluid adjustment.

Spray standoff distance

Typical airless spray distance is 12 to 18 inches from the surface, adjusted to the product and equipment. Too close causes runs; too far causes dry spray.

Compressed air filter

Coalescing and particulate filters remove oil, water, and dirt from spray air. Contaminated air can cause fisheyes, poor adhesion, and surface defects.

SSPC-PA 2

Standard procedure for measuring dry-film thickness on steel. It defines spot measurements, gage readings, frequency, and acceptance limits with individual and average criteria.

Holiday detection

Electrical test that finds pinholes or thin spots in a coating. Low-voltage wet-sponge testing suits thin films; high-voltage testing suits thicker or immersion coatings.

Cross-cut adhesion

ASTM D3359 tape test that cuts a lattice through a coating and assesses removal after tape pull-off. It is mainly used on films below about 5 mils.

Pull-off adhesion

ASTM D4541 test that bonds a loading fixture to the coating and measures the tensile stress required to detach it. Results report both pressure and failure mode.

Blistering ASTM D714

Visual standard that rates blisters by size and frequency. Blistering can result from soluble salts, moisture, poor adhesion, or inadequate cure.

Solvent rub test

Cure check using a solvent-wetted cloth rubbed on the film. Softening or coating removal indicates incomplete cure; the specific solvent and procedure must follow the specification.

Dry spray

Rough, powdery overspray deposit caused by solvent evaporating before droplets reach the surface. It usually results from excessive distance, high temperature, or improper atomization.

Safety Data Sheet

Document required by hazard communication rules that lists chemical hazards, safe handling, PPE, first aid, firefighting, and disposal information for a coating product.

Confined space oxygen range

Atmospheric testing for entry generally requires oxygen between 19.5% and 23.5%. Values outside this range require ventilation, further testing, and entry control.

Silica exposure controls

Abrasive blasting with silica sand can cause silicosis. Controls include substitute abrasives, engineering ventilation, respiratory protection, and air monitoring.

VOC content

Volatile organic compound mass per volume or mass of coating. Regulations may set VOC limits, and low-VOC products reduce emissions but can change application properties.

Bonding and grounding

Electrically connects conductive equipment to prevent static sparks when handling flammable solvents. It is required for flammable-liquid transfer and spray operations.