1. Boundary and Fundamentals of PVC Thick Board vs Thin Board
In engineering plastics procurement, selecting between PVC thick board and thin board is one of the most common decisions buyers face. The two differ not only in thickness but in entirely different application scenarios, processing methods and pricing. The industry typically classifies PVC board into three tiers by thickness:
- Thin board: 1-5mm, mainly for decoration, signage, lining
- Medium-thick board: 5-10mm, transitional, balancing strength and cost
- PVC thick board: ≥10mm (some manufacturers use ≥8mm as the boundary), mainly for load-bearing, anti-corrosion and structural support
PVC thick board consumes more raw material, requires more demanding pressing processes and processing, with prices rising linearly. Grasping the difference accurately is the premise for controlling procurement cost and avoiding waste. This article compares the two across four dimensions: specs, applications, price and selection tips.
2. Spec Parameter Comparison
2.1 Thickness Specs and Tolerances
| Type | Thickness (mm) | Tolerance (mm) | Panel size (mm) | Note |
|---|---|---|---|---|
| Thin | 1-3 | ±0.1 | 1220×2440 | Roll or sheet |
| Thin | 3-5 | ±0.15 | 1220×2440 | Flat sheet |
| Medium | 5-10 | ±0.2 | 1220×2440 / 1000×2000 | Custom cut |
| Thick | 10-20 | ±0.2-0.3 | 1220×2440 / 2000×4000 | Large splice |
| Thick | 20-50 | ±0.3-0.5 | 1220×2440 / 2000×4000 | Heavy structural |
| Ultra-thick | 50-80 | ±0.5-0.8 | 1000×2000 | Custom pressed |
2.2 Key Performance Parameters
| Parameter | Thin (3mm) | Thick (20mm) | Standard |
|---|---|---|---|
| Density (g/cm³) | 1.38-1.45 | 1.40-1.48 | GB/T 1033 |
| Tensile strength (MPa) | ≥45 | ≥45 | GB/T 1040 |
| Flexural strength (MPa) | ≥75 | ≥80 | GB/T 9341 |
| Impact strength (kJ/m²) | ≥5 | ≥6 | GB/T 1843 |
| Vicat softening temp (℃) | ≥80 | ≥80 | GB/T 1633 |
| Load-bearing capacity | Low | High | — |
| Weldability | Excellent | Excellent | GB/T 22789.1 |
Mechanical strength between thin and thick PVC is largely the same, but load-bearing capacity and rigidity rise sharply with thickness—this is the key difference for structural and impact loads.
3. PVC Thick Board Applications
3.1 Chemical Anti-Corrosion Linings
PVC thick board is the main material for chemical reactor and acid/alkali tank linings. 10-20mm boards withstand media pressure and agitation, with long-term resistance to dilute sulfuric acid, hydrochloric acid and sodium hydroxide. Thickness selection depends on tank diameter, media density and agitation speed—tanks above 2m diameter generally need 15mm or thicker.
3.2 Electroplating and Electrolytic Tanks
Electroplating tank linings face strong acids (chromic, sulfuric) and electrolytes long-term; 15-20mm PVC thick board is standard. This scenario demands excellent weld quality and impermeability—choose Grade 1 per GB/T 22789.1 with non-destructive weld reports.
3.3 Structural Support Components
Wear pads, insulating plates and equipment bases often use 20-50mm PVC thick board. This thickness range combines insulation with load-bearing, replacing metal parts to reduce weight and cost.
3.4 Ducts and Exhaust Systems
Chemical plant anti-corrosion ducts and electroplating exhaust pipes are commonly roll-welded from 8-15mm PVC thick board. Thickness selection depends on duct diameter and negative pressure—above DN500 use 10mm or thicker.
4. Thin Board Applications
4.1 Advertising Signage and Display Boards
1-3mm thin board is standard for advertising signage, UV print display boards and POP stands. Lightweight, easy to cut, screen-printable and vacuum-formable; commonly white or colored.
4.2 Decorative Lining and Wall Panels
2-5mm thin board for bathroom wall panels, kitchen oil-proof panels and laboratory bench mats. Demands high surface flatness and color consistency—choose extruded mirror or matte boards.
4.3 Electronic and Electrical Insulation
1-3mm rigid PVC thin board is an excellent electrical insulator with volume resistivity ≥10¹⁴ Ω·cm—commonly used for electrical linings, PCB separators and battery separators.
4.4 Models and Crafts
1-2mm thin board is widely used in architectural models, DIY crafts and teaching aids due to easy cutting, heat-bending and smooth surface.
5. Price Comparison
5.1 Price Ranges
Domestic rigid PVC board reference prices (for reference only):
| Thickness (mm) | Type | Price Range (RMB/m²) |
|---|---|---|
| 2 | Thin | 25-40 |
| 3 | Thin | 35-55 |
| 5 | Medium | 50-75 |
| 8 | Medium | 80-120 |
| 10 | Thick | 100-150 |
| 15 | Thick | 150-220 |
| 20 | Thick | 200-280 |
| 30 | Thick | 300-420 |
| 50 | Ultra-thick | 500-700 |
5.2 Price Factors
- Raw material cost: PVC resin powder fluctuates with oil prices
- Pressing process: thick board requires multi-layer pressing, higher energy and equipment cost
- Tolerance control: thin board has tight tolerance, sometimes more expensive
- Brand difference: imports (AGRU, Röchling) are 1.8-2.5x domestic
- MOQ: ≥50 sheets unlocks tiered pricing, saving 5%-15%
6. Selection Decision Points
- Load requirement: load-bearing or pressure → thick board; decoration only → thin
- Media condition: chemical contact ≥10mm; general anti-corrosion ≥5mm
- Processing method: thin can be cut and bent; thick requires sawing and machining
- Tolerance requirement: precision parts use ±0.1mm tight tolerance
- Panel size: large linings prefer large panels to reduce seams
- Budget: 8-12mm for value; 15mm+ for heavy loads
- Standard: chemical use GB/T 22789.1; food-grade GB 4806.7
As a professional engineering plastics supplier, huagong offers one-stop procurement of PVC boards across 1-80mm thickness, with cutting, welding and machining customization. Contact us for quotations.
7. FAQ
Q1: How thick can PVC thick board be?
Domestic pressing typically maxes at 50mm, custom up to 80mm. Above 80mm, laminated splicing is recommended but with compromised strength and stability. See /products/engineering_plastic for thickness specs.
Q2: Can both thin and thick PVC boards be welded?
Yes. Thin board uses hot-air welding; thick board also supports extrusion welding (welding rod diameter 3-5mm), with weld strength reaching 80%+ of base material.
Q3: Can thin board be used for load-bearing parts?
Not recommended. 1-5mm thin board lacks rigidity and deforms or buckles under load. Load-bearing scenarios require thick board (≥10mm), with thickness confirmed by load calculation.
Q4: Why is thick PVC board so much more expensive than thin?
Thick board uses more material, longer pressing time and higher energy, with more customization. But per-volume unit price is similar—the difference is mainly per-square-meter material usage.
Q5: Can thin board be used for chemical anti-corrosion?
Short-term small-area applications can use 3-5mm thin board; for long-term strong acid/alkali contact use thick board ≥10mm. Thin board is vulnerable to media penetration and impact failure—see /blog/pvc-board-specifications-and-prices.
8. Summary and Action
The difference between PVC thick and thin board goes beyond thickness to encompass application scenarios, processing methods and pricing. Before procurement, clarify load, media and processing requirements, then evaluate together with the thickness spec table and price ranges to buy material that meets both technical and cost goals.
For detailed thickness spec sheets, test reports or the latest quotation, contact huagong—our engineering plastics team provides professional PVC thick and thin board selection support.
Related:
- Browse the Engineering Plastics Center for full-thickness PVC board specs
- Read PVC Board Specifications and Prices for the basic spec system
- Contact huagong for custom cutting and thickness selection solutions