Data Hub
Reference tables and computed data: chemistry matrix, ISO 12944, surface prep equivalents, coverage and dew point.
Chemistry performance matrix
Generalized relative ratings for nine resin families across eight properties. Darker = stronger. Hover a cell for detail, or compare up to three side by side.
| Chemistry | UV & weathering | Chemical resistance | Abrasion & impact | Flexibility | Cure speed | Corrosion protection | Ease of application | Cost economy |
|---|---|---|---|---|---|---|---|---|
| Epoxy | 1 | 5 | 4 | 2 | 2 | 4 | 4 | 4 |
| Polyurethane | 5 | 3 | 4 | 4 | 3 | 3 | 4 | 3 |
| Polyurea | 3 | 4 | 5 | 5 | 5 | 4 | 1 | 2 |
| Polyaspartic | 5 | 4 | 4 | 3 | 4 | 3 | 3 | 2 |
| Zinc-rich | 3 | 2 | 4 | 2 | 3 | 5 | 2 | 3 |
| Acrylic | 4 | 2 | 2 | 4 | 4 | 2 | 5 | 5 |
| Alkyd | 2 | 1 | 2 | 3 | 1 | 2 | 5 | 5 |
| Fluoropolymer | 5 | 4 | 3 | 3 | 2 | 3 | 2 | 1 |
| Powder | 3 | 4 | 4 | 3 | 3 | 3 | 2 | 4 |
ISO 12944-2 atmospheric corrosivity categories
First-year thickness loss of low-carbon steel used to classify environments. See the full guide to ISO 12944 corrosivity categories.
| Category | Corrosivity | Steel loss, year 1 (µm) | Typical exterior examples |
|---|---|---|---|
| C1 | Very low | ≤ 1.3 | Heated, dry interiors |
| C2 | Low | > 1.3 – 25 | Rural areas, low pollution |
| C3 | Medium | > 25 – 50 | Urban/industrial, moderate SO₂; low-salinity coast |
| C4 | High | > 50 – 80 | Industrial areas, moderate-salinity coast |
| C5 | Very high | > 80 – 200 | High-humidity industrial, high-salinity coast |
| CX | Extreme | > 200 – 700 | Offshore, extreme humidity and salinity |
| Durability range (ISO 12944-1) | Low (L) | Medium (M) | High (H) | Very high (VH) |
|---|---|---|---|---|
| Time to first major maintenance | up to 7 years | 7–15 years | 15–25 years | more than 25 years |
Abrasive blast cleanliness equivalents
Approximate equivalents between SSPC/AMPP, NACE and ISO 8501-1 grades. They are close, not identical — read the full comparison.
| Description | SSPC | NACE | ISO 8501-1 | Visible residue allowed |
|---|---|---|---|---|
| White metal | SP 5 | No. 1 | Sa 3 | None |
| Near-white metal | SP 10 | No. 2 | Sa 2½ | Staining ≤ 5% of each unit area |
| Commercial | SP 6 | No. 3 | Sa 2 | Staining ≤ 33% of each unit area |
| Brush-off | SP 7 | No. 4 | Sa 1 | Tightly adherent material may remain |
| Power tool to bare metal | SP 11 | — | — | None; retains or produces profile |
| Power tool cleaning | SP 3 | — | St 3 | Tightly adherent material may remain |
| Hand tool cleaning | SP 2 | — | St 2 | Tightly adherent material may remain |
Theoretical coverage quick reference
Square feet per US gallon at 0% loss (1,604 × VS ÷ DFT). Use the coverage calculator for loss factors and metric units.
| Volume solids ↓ · DFT → | 2 mils | 3 mils | 4 mils | 6 mils | 8 mils | 10 mils | 15 mils | 20 mils |
|---|---|---|---|---|---|---|---|---|
| 40% | 321 | 214 | 160 | 107 | 80 | 64 | 43 | 32 |
| 50% | 401 | 267 | 201 | 134 | 100 | 80 | 53 | 40 |
| 60% | 481 | 321 | 241 | 160 | 120 | 96 | 64 | 48 |
| 70% | 561 | 374 | 281 | 187 | 140 | 112 | 75 | 56 |
| 80% | 642 | 428 | 321 | 214 | 160 | 128 | 86 | 64 |
| 90% | 722 | 481 | 361 | 241 | 180 | 144 | 96 | 72 |
| 100% | 802 | 535 | 401 | 267 | 201 | 160 | 107 | 80 |
Dew point table (°F)
Calculated with the Magnus formula. Shaded cells show the minimum surface temperature (dew point + 5 °F). Check live conditions with the dew point calculator.
| Air °F ↓ · RH → | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|
| 40 °F | 11min 16 | 18min 23 | 23min 28 | 27min 32 | 31min 36 | 34min 39 | 37min 42 |
| 50 °F | 20min 25 | 27min 32 | 32min 37 | 37min 42 | 41min 46 | 44min 49 | 47min 52 |
| 60 °F | 28min 33 | 36min 41 | 41min 46 | 46min 51 | 50min 55 | 54min 59 | 57min 62 |
| 70 °F | 37min 42 | 45min 50 | 50min 55 | 55min 60 | 60min 65 | 64min 69 | 67min 72 |
| 80 °F | 46min 51 | 54min 59 | 60min 65 | 65min 70 | 69min 74 | 73min 78 | 77min 82 |
| 90 °F | 54min 59 | 62min 67 | 69min 74 | 74min 79 | 79min 84 | 83min 88 | 87min 92 |
| 100 °F | 63min 68 | 71min 76 | 78min 83 | 84min 89 | 88min 93 | 93min 98 | 97min 102 |