POLYMER COATING SELECTION GUIDE
| Polymer | Compatibility & Application | Non - Compatibility |
| HDPE | Storage of Caustics, Metal Finishing Chemicals, Organic &In Organic Acids, Water Treatment Chemicals, Plating Chemicals & Brine FDA 21 CFR 177. 1520 | Strong Oxidizing Agents, Aromatic Hydro Carbons & Halogenated Aliphatic Hydro Carbons |
| PP | Suitable for many corrosive chemicals which are not suitable for FRP Storage of Sulfuric Acid, Hydrochloric Acid, Hydrofluoric Acid, Organic & In Organic Chemicals | Strong Oxidizing Agents & Halogenated Aliphatic Hydro Carbons |
| PVDF | Superior Resistance to Inorganic Acids, Strong Oxidizing Agents & Halogenated Chemicals FDA 21 CFR 177. 2510 | Ketones, Esters, Amines & Hot Concentrated Caustics |
| HALAR | Similar to PVDF but having better resistance to Ketones FDA 21 CFR 177. 2510 | Amines & Halogenated Hydro Carbons like MDC, EDC, Bromo Benzene |
| Polymer | Chemical Resistance | Stress Crack Resistance | Maximum Operating Temperature | Brittleness Temperature | Impact Resistance | FDA Applicability | Color |
| HDPE | Very Good | Good | Deg C | -70 Deg C | Good | Yes | Black |
| PP | Very Good | Excellent | 65 Deg C | -118 Deg C | Excellent | No | Offwhite |
| PVDF | Excellent | Good | 80 Deg C | -40 Deg C | Good | Yes | Brown |
| HALAR | Excellent | Good | 95 Deg C | -80 Deg C | Good | Yes | Green |
COMPARISON OF PROPERTIES OF POLYMERS COATINGS
The important properties to be considered of coating are as follow
| Material | SpecificGravity | MeltingPointC | Max working temprature C | HardnessShore | ChemicalResistance | AbrasionResistance | RawMaterialCost |
| PFA | 2.15 | 305 | 200 | D-64 | Excellent | poor | Expensive |
| FEP | 2.15 | 265 | 180 | D-55 | Excellent | poor | Expensive |
| ETFE | 1.74 | 245 | 120 | D-63-72 | Excellent-1 | Excellent | Moderate |
| ECTFE(Halar) | 1.68 | 221 | 100 | D-75 | Excellent-1 | Excellent | Moderate |
| PVDF | 1.77 | 165 | 80 | D-75-80 | Excellent-2 | Excellent | Moderate |
| PP | 0.942 | 155 | 80 | D-58 | Good 3 | Supreme | Low Cost |
| HDPE | 0.96 | 105 | 60 | D-44 | Good 4 | Good | Lowest Cost |
- Attacked by strong oxidizing agents and hot amines (For ETFE & HALAR)
- Resistant to acids and bases ; dissolved by polar organics (For PVDF)
- Resistant to acids and bases ; attacked by strong oxidizing agents (For PP)
- Resistant to dilute acids and bases; attacked by strong oxidizing agents (For HDPE)
- PFA - Per Fluoro Alkoxy
- PVDF - Poly Vinylidene Fluoride
- FEP - Fluorinated Ethylene Propylene
- PP - Polypropylene
- ETFE - Ethylene Tetra Fluoro Ethylene
- HDPE - High Density Polythylene
- ECTFE - Ethylene Chloro Trifluoro Ethylene