Choosing the right signage material can make or break how your message performs. Two popular options for businesses—Sunpack (often called sunpack board, coroplast, or corrugated plastic) and Flex Board (flex, flex banner on PVC or vinyl)—both have strong use-cases but are suited to different needs. This guide walks you through everything: material differences, durability, print quality, cost, installation, environmental factors, and real-world recommendations so you can choose confidently.
Quick Difference
- Sunpack (corrugated plastic): Lightweight, rigid, inexpensive, good for short-to-medium outdoor use (yard signs, directional signs), easy to cut and mount. Best for budget signboards, temporary promotions, and where a rigid panel is needed.
- Flex Board (PVC/Vinyl flex banner): Flexible, durable, excellent print quality for large-format graphics, weather-resistant, suited to long-term outdoor advertising like hoardings, banners, shopfronts. Best for vibrant large graphics and long-run outdoor campaigns.
If you need rigid panels for mounting (e.g., point-of-sale signage, small billboard boards, directional signage), go Sunpack. If you need large-format, vibrant, weather-resistant banners that can be hung or stretched (e.g., building wraps, hoardings, outdoor banners), go Flex Board.
What are they? (Materials explained)
Sunpack (Corrugated Plastic / Corrugated PP)
Sunpack is a lightweight, fluted plastic sheet—usually polypropylene—that looks like a plastic version of corrugated cardboard. It’s manufactured in various thicknesses (commonly 3mm, 4mm, 5mm). The fluted core provides stiffness while keeping weight low. It’s often called corrugated plastic, Coroplast (brand), or twin-wall polypropylene.
Flex Board (PVC / Vinyl Flex Banner)
Flex board typically refers to PVC flex banner material: a woven polyester core coated with PVC (polyvinyl chloride). It’s a flexible, tear-resistant sheet that’s printable on both sides and used for digitally printed banners and hoardings. Thickness and weight vary; heavier weights are more durable outdoors.
Durability & Weather Resistance
Sunpack
- Resistant to moisture and rot (unlike cardboard).
- Stiffness gives wind resistance when mounted flat; however, strong winds can cause flapping or edge damage if not properly mounted.
- UV resistance depends on grade—cheaper grades fade and become brittle after prolonged sun exposure; UV-stabilised options last longer but still are generally for short-to-medium term use.
- Typical outdoor life: a few months to 1–2 years depending on quality, UV exposure, and mounting.
Flex Board
- Designed for prolonged outdoor exposure; PVC coating + polyester core makes it tough and UV-resistant (when treated).
- Handles wind well when installed with reinforcements (grommets, ropes, pole pockets, frames).
- Typical outdoor life: 1–5 years depending on material weight (heavy-duty up to 5+ years with correct finishing and UV inks).
Winner for longevity: Flex Board (especially heavy-duty, UV-treated variants).
Print Quality & Visual Impact
Sunpack
- Good printability using UV or solvent printing.
- Because it’s rigid and less porous than some substrates, colors look crisp but not as saturated as on vinyl.
- Best for smaller sized graphics, spot signage, and situations where viewing distance is close.
Flex Board
- Excellent print surface for large, continuous graphics.
- Vibrant, saturated colors, smooth gradients, and large photographic prints reproduce well.
- Ideal for big visuals viewed from a distance (hoardings, banners, stadium signage).
Winner for image quality and scale: Flex Board.
Ease of Installation & Versatility
Sunpack
- Very easy to cut, drill, and mount—can be screwed, riveted, zip-tied or taped.
- Good for sandwich boards, retail POS, election boards, wayfinding, and small signboards.
- Lightweight makes it cheap to ship and handle.
Flex Board
- Flexible—can be hemmed, grommeted, welded, stitched, or framed.
- Needs tensioning hardware for flat displays (frames, poles, ropes).
- Can be rolled for transport (saves space) but requires experience for wrinkle-free installation.
Winner for DIY and quick mounting: Sunpack (easier for small jobs).
Winner for large, professional installations: Flex Board (with proper finishing).
Cost Comparison
Costs vary by region, thickness, print process, and finishing. A rough guideline:
- Sunpack: lower material cost; economical for short runs and many small signs.
- Flex Board: higher material cost per sq. ft for heavy-duty PVC, but cost-efficient for very large prints since you can print seamlessly at scale.
If budget is tight and the signage is temporary or small, Sunpack is more economical. For large, long-run outdoor advertising that must look premium, Flex Board delivers better ROI.
Use Cases (When to pick which)
Choose Sunpack if:
- You need rigid panels (directional signs, standees, menu boards).
- Signs will be short-term (events, promotions, elections).
- You want something lightweight and inexpensive to produce and install.
- You need to cut specific shapes or do custom die-cuts.
Choose Flex Board if:
- You need large, eye-catching visuals (hoardings, stage backdrops, building wraps).
- The sign will be outdoors for long periods.
- You require high-resolution photographic printing and color saturation.
- You need a solution that can be rolled up and reused.
Finishing & Installation Tips
For Sunpack
- Use corrosion-resistant screws or zip ties for mounting.
- Edge-protect when installing in windy areas to prevent delamination.
- Laminate for extra UV protection if you need longer life.
- Consider V-cut or easel-back for free-standing displays.
For Flex Board
- Use hemmed edges and brass grommets spaced every ~12–18 inches for hanging.
- Stitch or weld seams for very large banners to avoid visible joins.
- Reinforce corners and use wind slits for very large spans to reduce wind load.
- Use mesh PVC for extreme wind exposure (fine perforations allow some air to pass through).
Environmental Considerations
Sunpack
- Usually polypropylene; recyclable in some streams but often not accepted curbside.
- Lightweight production footprint vs PVC, but end-of-life disposal can be an issue.
Flex Board
- PVC has a heavier environmental footprint and is harder to recycle.
- Some suppliers offer eco PVC alternatives (PE/eco-flex) or promote take-back/recycling programs.
If sustainability is a priority, ask suppliers for recyclable/eco-friendly materials or choose reusable frames and replace only printed skins.
Maintenance & Lifespan Factors
- Cleaning: Both can be wiped clean with mild soap and water. Avoid harsh solvents (they can damage inks or substrate).
- Storage: Roll flex banners (print outward) on cores to prevent creases. Store sunpack flat to avoid warping.
- Avoiding damage: Prevent prolonged rubbing, and keep edges protected during transport.
Cost-Saving Strategies
- Use Sunpack for many small signs instead of multiple small flex prints: saves on setup and material.
- For long term but cost-sensitive large signage, use Flex Board with a durable finish that extends life—lower replacement frequency saves money.
- Re-use frames (metal or wooden) and replace only printed skins.
- Order in bulk to reduce per-square-foot print costs.
Real-World Examples
- Real Estate Yard Signs / Election Boards: Sunpack — cheap, rigid, easy to stake.
- Mall or Retail POS Displays: Sunpack for small in-store rigid signs; Flex for larger hanging banners.
- Outdoor Hoardings / Building Wraps: Flex Board (or mesh flex for windy sites).
- Event Backdrops / Stage Graphics: Flex Board for seamless large prints.
- Temporary Promotions / A-Frame Signs: Sunpack or laminated Sunpack for short campaigns.
Final Recommendation (How to decide in 60 seconds)
- Does it need to be rigid? → Sunpack.
- Is it large-scale, photographic, or long-term outdoor? → Flex Board.
- Is your budget very tight and project short-term? → Sunpack.
- Want high visual impact and durability? → Flex Board.
When in doubt: consider a hybrid approach—use flex for main large visuals and sunpack for smaller directional or secondary signage. This often balances cost and visual consistency.
Quick checklist for ordering (so you don't forget)
- Final viewing distance (close → sunpack ok; far → flex better)
- Outdoor exposure & wind load (high → flex with reinforcements)
- Desired lifespan (short → sunpack; long → flex)
- Mounting method available (frame, grommet, pole)
- UV inks & lamination needs specified
- Finishing: grommets, hems, stitching, edge protection
- Transport & storage plan
Conclusion
Both Sunpack and Flex Board are valuable tools in a business’s signage toolbox. Sunpack shines for cost-effective, rigid, small-to-medium signs and quick-turn campaigns. Flex Board wins when you need scale, vibrancy, and long-term outdoor performance. Match the material to the visual ambition, budget, and expected lifespan of your campaign—and when appropriate combine both for the best results.