Corrugated Plastic Blanks 18"x24"x4mm

Corrugated Plastic Sign Blanks 18x24 — 4mm Fluted Polypropylene

Standard 18"x24" corrugated plastic sign blanks in 4mm thickness — the most widely used sign blank size in the industry. Lightweight, weatherproof and UV resistant with a smooth surface ready for vinyl lettering, digital printing or screen printing. Fluted polypropylene construction does not absorb moisture, rust or rot.

Available in white and yellow. 28 available to ship today. No wholesale account required — transparent tiered pricing with quantity discounts. Local pickup available same day in Omaha, NE.

Specifications

• Material: Corrugated fluted polypropylene (Coroplast)
• Thickness: 4mm
• Size: 18" x 24"
• Colors: White, Yellow
• Surface: Smooth, Corona treated — print-receptive
• Outdoor durability: 2–3 years
• H-stake compatible: Yes — flutes run 18" for standard wire stake insertion

Applications & Uses

The standard size for yard signs, real estate signs, election signs and directional event signage. Compatible with H-stakes for ground mounting. Ready for Oracal 651 vinyl lettering, direct screen printing or digital print with appropriate inks. Used by sign shops, real estate agencies, political campaigns and event companies.

For larger sheet stock see our corrugated sign panels 4x8 — yields approximately 8 standard 18x24 blanks per sheet. For rigid metal sign blanks see our aluminum sign sheets and ACM sign sheets.

Why Corona Treated Corrugated Plastic

Corona treatment is a surface activation process that increases the surface energy of the polypropylene, allowing inks and adhesives to bond properly. Untreated corrugated plastic will cause ink to bead and vinyl to peel prematurely. CSS stocks Corona treated blanks as standard — the same spec used by professional sign shops.

Ordering & Shipping

No wholesale account required. Transparent tiered pricing — $3.73 per blank at 1+, $2.38 at 50+, $2.29 at 100+. 28 available to ship today. Local pickup available same day in Omaha, NE — no waiting on freight shipping. Ships nationwide. Sign shops, real estate agencies and political campaigns welcome — contact us for pricing on larger quantity orders.