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Durable, waterproof twin-wall polypropylene sheets for signage, packaging, layer pads, floor protection and agriculture. Custom size, thickness, colour and printing — factory direct.
We extrude our own sheet on our own lines. That is the difference between buying from a factory and buying from a trading company.
No trading company in between. You buy from the line that extrudes the sheet, which typically saves 15–25% against a distributor quote.
Colour, thickness and strength stay consistent from batch to batch, so you can plan repeat orders without re-testing every time.
15+ fully automated extrusion lines running in parallel, so a full-container order does not queue behind someone else's order. On-time rate 98%.
Thickness 2–12mm, any width and length, any colour, plus printing, die-cutting, folding, welding and assembly. Send a drawing or a photo and we will quote it.
Anti-static / ESD / conductive, flame-retardant UL94 V-0, UV-stabilised, corona-treated for ink adhesion, food-contact grade on request.
We send A4 or A3 samples in your chosen specification so you can test fit, printability and colour before committing to bulk.
Also called corrugated plastic sheet, PP hollow board, twin-wall polypropylene sheet, fluted plastic sheet — or by the trade names Coroplast, Corflute and Correx.
Two flat liners are bonded to a fluted (corrugated) core, forming a twin-wall structure. This hollow core distributes weight and impact force far more efficiently than a solid sheet of the same thickness, which is why you get the rigidity you need at roughly half the weight of solid plastic board.
Because polypropylene is chemically inert, the finished sheet does not absorb water, will not rot or mildew, and holds its properties in rain, humidity and coastal air. It is used across advertising and signage, logistics and packaging, construction protection, electronics and agriculture.
Yard signs, arrow boards, real estate signs, election posters, retail displays. UV-stable for 3–5 years outdoors.
Layer pads, dividers, partitions, turnover boxes. Anti-static and ESD grades for electronics.
Floor and wall protection, tree guards, greenhouse panels, fruit and vegetable crates.
The most common types our customers order. If you are not sure which one fits your job, tell us the application and we will recommend a specification.
Also known as Corriboard, Corriflute, Twinplast Fluteboard or PP hollow board. The standard grade for general use.
Send Inquiry →PP hollow board is a durable material for die-cut, folded, printed plastic corrugated boxes — collapsible, glue-free and stackable.
Send Inquiry →A versatile, durable material ideal for plastic corrugated signs, yard signs and retail displays.
Send Inquiry →Waterproof, corner-treated corrugated PP sheets for layer pads, dividers and partitions protecting fragile goods.
Send Inquiry →Waterproof, printable sheets that bend easily for floor, wall and window protection during renovation.
Send Inquiry →UV-resistant, easy to install corrugated plastic tree guards built to last for years outdoors.
Send Inquiry →Conductive and anti-static grades, 10⁶–10⁹ Ω surface resistance, for electronics packaging and trays.
Send Inquiry →Durable, waterproof PP corrugated dividers tailored to your containers, bins and boxes.
Send Inquiry →Thickness 2–12mm, width up to 2600mm, white, black, yellow, blue and any custom colour.
Send Inquiry →Eight properties that decide where this material is the right choice — and where it is not.
The twin-wall hollow core gives stiffness at roughly half the weight of solid board.
PP does not absorb water. No swelling, no softening, no loss of strength when wet.
Cut with standard tools, routed, drilled, hot-folded, welded. No special equipment.
Rated for 10+ return trips — a far lower cost per use than corrugated cardboard.
Mono-material PP with no paper core, fully recyclable back into the plastic stream.
Takes silk screen, flexographic and UV digital ink cleanly. Corona treatment available.
UV-stabilised grades hold colour and rigidity for 3–5 years outdoors.
Smooth surface, stains wipe off, unaffected by most cleaning chemicals.
We run 15 fully automated extrusion lines in our own X,000 m² plant in Weifang, Shandong. In-house extrusion means we control the whole chain — compounding, extrusion, calibration, cutting, printing and packing — rather than buying semi-finished board from someone else and hoping it matches spec.
Whether you want to try a small sample or suddenly receive a full-container order, our capacity can assure 98% on-time delivery without delaying your business. Third-party inspection (SGS, BV, TÜV) is welcome, and we photograph and document the goods before loading.
Shandong Runping Plastic has supplied customers in 56 countries and regions since 2003.
We have passed more than 20 domestic and international certification certificates, including ISO 9001, ISO 14001 environmental management system certification, SGS food grade testing and RoHS / REACH restricted-substance compliance.
Whether we ship to the United States, Germany, Australia, the Middle East or Southeast Asia, we are familiar with customs clearance documentation for these destinations and pack to survive a full sea voyage without corner damage or water ingress. Send us your destination port and we will confirm freight cost and lead time.
| ISO 9001 | Quality management system [核对编号并放证书扫描件] |
| ISO 14001 | Environmental management system |
| SGS | Third-party material and food-contact testing [按实际有的写] |
| RoHS / REACH | Restricted-substance compliance for EU markets |
| UL94 V-0 | Flame-retardant grade available on request [无则删除此行] |
Every application below lists the products, the usual specification, and what the buyer should watch for.
The single largest application. Because the surface takes ink cleanly and the sheet is completely waterproof, printed boards outlast painted plywood or corrugated cardboard in every outdoor position.
Replacing wooden pallets and polystyrene dividers for heavy or fragile cargo. The sheet absorbs almost no water, so goods stay dry through a sea voyage that would ruin cardboard, and a single pallet can be reused dozens of times.
Floors, windows, countertops and finished surfaces during renovation and moving. The sheet is light enough for one person to carry across a floor, flexible enough to bend around a stair edge, and it survives the grit and traffic of a building site.
Tree guards protect saplings from mechanical damage and browsing. PP takes UV exposure without yellowing, unlike thin film or cardboard collars. The same material assembles into returnable fruit and vegetable crates that get washed and reused.
Static discharge destroys components before they ship. We supply conductive and anti-static grades so the sheet does not become a charge reservoir during handling.
6–10 mm, 10⁶–10⁹ Ω, black or grey. Ask for the resistance value with the order, not just "ESD".
Pop-up displays, shelf systems, wardrobe boxes, storage totes and collapsible boxes that fold and weld without stitching or glue.
3–5 mm, ultrasonic welded or hot-folded, flat-packed to save container space.
Salt air and constant humidity degrade wood, steel and paper quickly. PP is inert and does not corrode or swell in coastal conditions.
4–6 mm, UV and corrosion stable. Used for boat parts packaging, dock and marina signage.
All values below are for standard 100% virgin PP material. Special grades and dimensions on request.
| Product name | PP Corrugated Plastic Sheet / Coroplast / Corflute / Correx / Twin-wall Fluted Board / PP Hollow Board |
| Material | 100% virgin polypropylene (PP), no recycled filler [如有混料可能请说明] |
| Thickness | 2, 2.5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 mm or customised |
| Standard sheet size | 1220 × 2440 mm (4' × 8') · 1097 × 2440 mm · width up to 2600 mm, any length |
| Flute options | 3 mm / 4 mm / 5 mm flute (varies by thickness) |
| Colours | White, black, blue, red, green, yellow, grey, orange, translucent, custom Pantone-matched |
| Surface treatment | One-side or two-side corona treatment (required for screen / UV printing) |
| Printing | 1–4 colours, silk screen / flexographic / UV digital, max print area 1600 × 2500 mm, one or both sides |
| Cutting & processing | Die-cut, CNC, guillotine, corner rounding, hole punching, folding, ultrasonic welding, assembly into finished parts |
| Special grades | Anti-static / ESD / conductive (10⁶–10⁹ Ω), flame-retardant UL94 V-0, UV-stabilised, food-contact grade |
| Working temperature | −20 °C to +80 °C (modified grades available for wider ranges) |
| Outdoor life | 3–5 years with UV-stabilised grade; up to 8+ years with heavy-duty UV grade |
| Recyclability | 100% recyclable PP, no paper core, reusable 10+ times |
| Packaging | Film-wrapped pallets, or export carton / pallet-less packing to your requirement |
| Container loading | 1×40HQ holds approx. X sheets of 4 mm 1220×2440 mm [按实际装柜量填] |
Weight is the most reliable way to confirm you are not being short-changed on thickness. Ask your supplier to confirm the areal weight, not just the millimetres.
| Thickness | Areal weight | Weight per sheet (1220×2440 mm) |
Typical use |
|---|---|---|---|
| 2.0 mm | 250–450 g/m² | 0.75–1.10 kg | Floor / wall protection, light packaging |
| 3.0 mm | 400–700 g/m² | 1.20–2.09 kg | Tree guards, garden stakes, signage |
| 4.0 mm | 500–800 g/m² | 1.49–2.39 kg | Most popular — signs, boxes, general use |
| 5.0 mm | 650–1200 g/m² | 1.94–3.58 kg | Layer pads, dividers, heavier duty |
| 6.0 mm | 800–1500 g/m² | 2.39–4.48 kg | ESD / anti-static electronics packaging |
| 8.0 mm | 1100–2000 g/m² | 3.28–5.97 kg | Pallet layers, load-bearing partitions |
| 10.0 mm | 1600–2400 g/m² | 4.77–7.16 kg | Double-wall pallets, heavy duty |
| 12.0 mm | 2000–3000 g/m² | 5.97–8.95 kg | Engineered panels, honeycomb applications |
Weight per sheet is calculated on a 1220 × 2440 mm sheet. Different flute structures shift the figure; confirm with your supplier before ordering.
The details buyers ask for first. If these do not fit your requirement, tell us and we will work around it.
| MOQ | 500 pieces. Mixed sizes and colours accepted in the same order [按实际改] |
| Sample | Free A4 / A3 samples in your spec. Dispatched within 3 days; sample cost refunded on first bulk order. |
| Lead time | 7–12 days for standard sizes · 15–20 days for custom printing or fabrication · Sample 3 days |
| Incoterms | EXW · FOB Qingdao · CIF to your nearest port. DDP available on request. |
| Payment terms | T/T: 30% deposit, 70% before shipment · L/C at sight · [其他方式按实际补] |
| Loading port | Qingdao, China [如有其他港口补上] |
| Shipping | Full container load, LCL, and air freight for samples and urgent small orders. |
| Documents | Invoice, packing list, bill of lading, certificate of origin. Third-party inspection reports on request. |
| Warranty | 12 months against manufacturing defects. Replacement or credit for verified defects. |
The honest version: corrugated plastic is not always the right choice. Here is when it is, and when it is not.
| Criterion | PP Corrugated Plastic | Corrugated Cardboard | Solid PP Sheet |
|---|---|---|---|
| Water resistance | Excellent — will not absorb water | Poor — fails when wet | Excellent |
| Reuse cycles | 10+ trips | 1 trip, occasionally 2 | 10+ trips |
| Stiffness at same thickness | High for the weight | Low | High, but roughly 2× the weight |
| Upfront cost | Medium | Lowest | Highest |
| Cost per use | Lowest over 5+ uses | Highest over time | Low |
| Print quality | Good, 1–4 colours, both sides | Good, but fades outdoors | Best — smooth, flat surface |
| Cutting in-house | Easy — scissors, saw, router | Easy | Harder — needs sharp tools |
| Outdoor life | 3–5 years UV grade | Days to weeks | 3–5 years UV grade |
| Recyclable | Yes, 100% mono-material | Yes, but needs dry, clean paper | Yes, 100% |
| Best choice for | Reusable, outdoor, wet or heavy-duty applications | One-time shipping, low budget | Where flatness matters more than weight |
The short version: if you need the material for more than one trip, or it will be exposed to water or sunlight, corrugated plastic wins on cost per use. If it is a single-use export carton and the budget is the only concern, cardboard wins on upfront cost.
Most complaints about corrugated plastic come from a mismatch between the grade bought and the job it was put to. Four steps to avoid that.
Before you pick a thickness, be specific about the service condition. What is the sheet doing — standing outdoors through a Northern winter, protecting precision electronics from static, or lining a warehouse floor during a fit-out?
Require a UV-stabilised grade. Untreated PP loses colour and becomes brittle outdoors within months.
Require a stated surface resistance (10⁶–10⁹ Ω), not just the words "ESD".
Check chemical compatibility for the specific medium, not just "corrosion resistant".
Require food-grade certification before the material enters that supply chain.
Standard PP works to −20 °C to +80 °C. Outside that, request a modified grade.
A partition needs compressive strength; a display board needs stiffness at low weight. Different jobs.
"High strength" and "long lasting" mean nothing on their own. Two checks are worth doing before you pay for a bulk order.
Pure PP has a density of about 0.91–0.93 g/cm³ and floats in water. If a sample sinks, it has been blended with fillers or recycled material, and durability will be well below the quoted figures. A cup of water and a piece of offcut is all it takes.
Virgin material shows a uniform, dense, slightly translucent texture. Recycled board shows mixed-colour flecks and a porous core. This is the most reliable way to see what you are actually buying.
Ask three questions in writing before you order: what is the areal weight in g/m², what is the flute structure, and what is the tolerance on thickness. A supplier who cannot answer these is guessing — and you will find out at the goods-in stage. Also confirm the surface treatment: a board without corona treatment will print well initially and start peeling in a few weeks outdoors.
Order the free sample. Put it in the actual environment — water, sun, a bending test, a print test — and check it. Then verify third-party certification for anything entering the food, medical or electronics supply chain. We supply SGS, ISO and RoHS documentation on request and accept your own inspection provider.
Six steps, with the quotation turnaround and production time for each.
In-line thickness and weight check, colour consistency check, print and dimension check against your approved sample. Third-party inspection (SGS, BV, TÜV) welcome.
Export packing to your requirement, full container load or LCL. Invoice, packing list, bill of lading and certificate of origin prepared for customs clearance in your country.
The questions we answer most often. If yours is not here, email us and we will reply within 12 hours.
Nothing physical — all three are trade names for the same product: twin-wall polypropylene corrugated sheet. Coroplast and Correx are the common names in North America and Australia, Corflute in the UK and Europe. The material is identical; what differs between suppliers is flute structure, thickness tolerance and surface quality, which is what you should actually compare.
Yes. Polypropylene does not absorb water, so the sheet will not swell, delaminate or lose strength in rain, and it can be washed and reused. For prolonged outdoor exposure we recommend a UV-stabilised grade; untreated PP fades and becomes brittle within months of direct sunlight. With a UV grade, 3–5 years of outdoor life is normal.
2–3 mm for floor and surface protection. 4 mm is the general-purpose choice and the most commonly specified — appropriate for signage, boxes and most general applications. 5–6 mm for layer pads and load-bearing partitions, or where anti-static properties are needed. 8–12 mm for double-wall pallets and engineered panels. If you tell us the application we will recommend a thickness rather than selling you the thickest one.
Yes. Thickness 2–12 mm, any width up to 2600 mm and any length, white / black / blue / red / green / yellow / grey / orange or custom Pantone-matched colours. Printing is 1–4 colours by silk screen, flexographic or UV digital, up to 1600 × 2500 mm, on one or both sides. We can also die-cut, drill, corner-round, fold, weld and assemble the sheet into finished parts. Send a drawing, DXF or a photo with dimensions.
MOQ is 500 pieces, and mixed sizes and colours are accepted within the same order, so you can test several grades in one shipment. Free samples in your own specification are available before any bulk order, and the sample cost is refunded when you place the first bulk order.
Standard sizes: 7–12 days after sample approval. Custom printing or fabrication: 15–20 days. Samples dispatch within 3 days. Delivery from Qingdao is roughly 25–35 days to European ports and 30–40 days to North America — tell us your destination and we will confirm the freight cost and available shipping lines.
Yes — the sheet is mono-material polypropylene with no paper core, unlike corrugated cardboard, which has a paper liner that must be separated before the material can be recycled. PP is one of the most widely recycled plastics and can go back into the manufacturing cycle. This is also a purchasing argument in many markets where packaging waste is taxed or restricted.
Two simple checks. First, the float test: pure PP has a density of about 0.91–0.93 g/cm³ and floats in water, while filled or recycled material sinks. Second, look at a cut section — virgin PP shows a uniform dense texture, while recycled board shows mixed-colour flecks and a porous core. We also supply third-party SGS verification on request.
Yes. We ship to 56+ countries and provide invoice, packing list, bill of lading and certificate of origin, prepared for customs clearance in your destination country. Third-party inspection (SGS, BV, TÜV) is welcome, and we will photograph and document the goods before loading.
We run 13 sets of high-precision die-cutting machines plus CNC and guillotine cutting, so we can deliver cut parts at your dimensions rather than flat sheets. The sheet can also be folded, hot-bent and ultrasonically welded into boxes, trays and assembled structures. If you send finished-part drawings, we can supply them ready to use. It is also easy to cut in-house with scissors, a saw or a router — no special machinery required.
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