AMPP CAS-1 flashcards
AMPP CAS-1 · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Wet to dry film conversion
- Dry film thickness equals wet film thickness multiplied by the volume solids fraction. A 10 mil wet film at 60 percent volume solids yields 6 mils dry, ignoring application losses.
- Theoretical coverage formula
- Coverage in square feet per gallon equals 1604 times the volume solids fraction divided by dry film thickness in mils. This gives the maximum coverage before losses.
- Stripe coat purpose
- A stripe coat is a thin extra coat applied by brush to edges, welds, and corners before or after the main coat to build film where spray tends to thin out.
- Recoat window
- The specified time interval during which the next coat may be applied without surface preparation. Exceeding it typically requires abrasion or solvent wiping to restore adhesion.
- Induction time
- The required standing period after mixing components and before application for certain catalyzed products. It is specified on the product data sheet and varies by temperature.
- Airless spray characteristics
- Airless spray forces material through a small tip at high pressure, typically 1,500 to 3,000 psi, producing less overspray than conventional air spray for high-solids coatings.
- Dew point spread rule
- Substrate temperature minus dew point. Most specifications require a spread of at least about 5 degrees Fahrenheit (3 degrees Celsius) before coating to prevent condensation.
- Volume solids meaning
- The fraction of a coating that remains as dry film after solvents evaporate. It is used in coverage and wet-to-dry thickness calculations and is listed on the data sheet.
- SSPC-SP 5 white metal
- Abrasive blast cleaning to a white metal finish with a uniform gray-white color and no visible rust, scale, or foreign matter. It is the highest blast cleanliness grade.
- SSPC-SP 10 near-white
- Abrasive blast cleaning that leaves at most five percent of the surface with light shadows, streaks, or stains. It is commonly specified for immersion service.
- SSPC-SP 6 commercial blast
- Abrasive blast cleaning that removes all visible oil, grease, dirt, and scale but permits staining and up to about one-third of the surface with slight residues.
- Surface profile measurement
- The roughness of a blasted surface, measured with a comparator or profile gauge. Typical angular profiles for high-performance systems are about 1.5 to 4 mils.
- SSPC-SP 1 solvent cleaning
- Removal of oil, grease, dirt, and similar contaminants by solvent, detergent, or steam before mechanical preparation. It prevents contaminants from being driven into the surface during blasting.
- SSPC-SP 2 and SP 3
- Hand tool and power tool cleaning that remove loose rust and scale but leave tightly adherent material. They do not achieve the cleanliness of abrasive blasting.
- SSPC-SP 11 bare metal
- Power-tool cleaning to bare metal, removing all visible coatings, rust, and scale from the surface. It is used where blasting is not permitted or practical.
- SSPC-SP 12 waterjetting grades
- Waterjetting cleanliness grades WJ-1 through WJ-4, paired with flash rust grades L, M, and H that describe the severity of rusting after waterjetting.
- Soluble salt testing
- Measurement of chlorides and sulfates on prepared surfaces by conductivity or ion-specific kits. Residual salts above specification limits cause premature coating failure.
- Abrasive cleanliness requirement
- Blasting abrasive must be clean, dry, and free of oil or salt contamination. Recycled abrasive can carry chlorides and fines that degrade the profile and adhesion.
- Dry film thickness gauge types
- Type 1 gauges use magnetic pull-off; Type 2 gauges are electronic. Eddy-current gauges measure nonconductive coatings on nonferrous substrates such as aluminum.
- DFT measurement practice
- Take a minimum of three readings per specified area, such as 100 square feet, and average them. No single reading should fall below the specified minimum.
- Holiday testing purpose
- High-voltage or low-voltage spark testing detects pinholes, thin spots, and discontinuities in a coating. Voltage is set per coating thickness and the product data sheet.
- Pull-off adhesion test
- A test per ASTM D4541 that measures the tensile force required to detach a coating. Results report strength in psi and the failure mode, cohesive or adhesive.
- Hold point definition
- A step in the work that cannot proceed without inspector approval. A witness point requires notification but not necessarily approval before work continues.
- Environmental inspection readings
- Recorded during inspection: air temperature, substrate temperature, relative humidity, dew point, and the dew point spread. These determine whether application conditions are acceptable.
- Cure verification methods
- Solvent rub, hardness, or cure tests confirm a coating has cured. Topcoating over an undercured coat can cause wrinkling or solvent entrapment and adhesion loss.
- Instrument calibration documentation
- Gauges should be verified and calibration documented before use. Readings on curved or edge surfaces are unreliable and should be avoided or corrected.
- Confined space atmospheric testing
- Testing for oxygen, flammables, and toxics before entry. Entry requires a permit, an attendant, and a rescue plan in addition to acceptable readings.
- Silica dust hazard
- Abrasive blasting with silica-containing media generates respirable dust. Controls include respiratory protection and dust suppression per applicable occupational exposure limits.
- VOC content meaning
- The mass of volatile organic compounds per unit volume of coating. Low-VOC and waterborne products reduce emissions and may require different application equipment.
- Bonding and grounding
- Flammable liquids require bonding and grounding during transfer to prevent static ignition. This applies to solvent and coating handling in addition to storage requirements.
- Waste characterization
- Spent abrasive, paint waste, and solvent rags are regulated wastes that must be characterized and disposed of per applicable environmental rules, not ordinary trash.
- Isocyanate respiratory protection
- Isocyanate-containing products require supplied-air or appropriate cartridge protection per the safety data sheet. Spray application in enclosed areas also requires ventilation.