Although polyethylene (PE) and polyvinyl chloride (PVC) sheets are both common thermoplastic sheets, they have obvious differences in composition, performance, use and processing methods. The following is a detailed comparison:
- Basic material differences
| Properties | Polyethylene (PE) | Polyvinyl chloride (PVC) |
| Chemical structure | Composed only of carbon and hydrogen, non-polar | Contains chlorine (Cl), a polar polymer |
| Common types | LDPE, HDPE, UHMW-PE, etc. | Hard PVC (uPVC), soft PVC |
| Safety | Food-grade safety, non-toxic and odorless | Contains chlorine, releases chlorine gas and toxic smoke when burned |
- Performance comparison
| Performance | Polyethylene (PE) | Polyvinyl chloride (PVC) |
| Density | Lower (0.91–0.96 g/cm³) | Slightly higher (about 1.4 g/cm³) |
| Hardness | Relatively flexible, especially | LDPE and HDPE Relatively hard, especially uPVC |
| Impact resistance | Very good (UHMW-PE is excellent) | Average (brittle at low temperatures) |
| Chemical resistance | Excellent, acid, alkali, salt, grease resistance | Good, some strong acids/organic solvents may affect |
| Waterproof | Excellent | Excellent |
| Weldability | Yes (hot melt welding, extrusion welding, etc.) | Yes (hot air welding, solvent bonding) |
| Surface treatment | Low surface energy, difficult to bond or screen print | Easy to print, glue, film |
| Weather resistance (outdoor) | Black HDPE is UV resistant, ordinary PE needs to add anti-UV agent | uPVC is sensitive to ultraviolet rays and is easy to age and become brittle |
| Friction coefficient | Very low (especially UHMW-PE) | High |
| Flame retardancy | Not flame retardant (flammable) | |
III. Processing technology comparison
Project Polyethylene sheet PVC sheet
Cutting Can be sawed, milled Can be sawed, cut, laser cut
Thermoforming Can be hot-bent at high temperature, but not easy to form by blister forming Good blister/hot bending performance
Bonding method Difficult bonding (needs plasma/flame treatment) Can be bonded with PVC glue/solvent
Printing Poor, special treatment required Good, the surface can be directly screen printed/UV printed
Welding Can be hot-air welding or extrusion welding, requiring the same type of welding rod Hot air welding and adhesive welding are both possible
IV. Typical application differences
Application of polyethylene sheet (PE) Application of polyvinyl chloride sheet (PVC)
Food processing cutting board, conveyor slideway Building wall panel, wire trough, door panel, partition
Chemical lining board, anti-corrosion pad, coal bunker lining Electrical insulation board, equipment housing, display board
Crane support pad, ground protection pad Advertising signboard, spray painting backboard, engraved signboard
Simulation skating rink, guide rail slider Water treatment equipment sheet, blister forming parts
Medical/marine parts, children’s amusement facilities PVC foam board (KT board, Chevron board) advertising material