Custom Printed C4 Envelopes UK: Branded A4 Document Mailers
Precision-manufactured custom printed C4 envelopes built to fit flat, unfolded A4 sheets (210 ×. 297 mm), presentation folders, contracts, and catalogues. As part of our complete custom printed envelopes trade line, we offer 100gsm high-white bond, 120gsm prestige smooth bond, unbleached brown kraft, and 360gsm rigid board substrates with tamper-evident Peel &. Seal and free UK delivery.
Executive Summary: Custom Printed C4 Envelopes at Printways UK
Custom printed C4 envelopes measure exactly 229 × 324 mm, built to hold standard unfolded A4 documents (210 ×. 297 mm), presentation folders, legal contracts, financial audits, and glossy brochures fully flat without creasing or folding. Printways provides UK trade-grade custom print across 100gsm high-white bond, 120gsm prestige smooth bond, unbleached eco-manila brown kraft, and ultra-stiff 360gsm all-board mailers. Certified for Royal Mail Large Letter compliance (up to 25mm thickness and 750g weight), our printed C4 mailers feature secure Peel &. Seal strips (24+ month shelf life), transparent address window options, and precision CMYK or Pantone PMS spot color print with free UK mainland delivery.
Technical Specifications: C4 Printed Envelope Series
Detailed dimensional parameters, substrates, closure mechanics, and UK postal classifications for C4 mailers.
| Substrate Category | Metric Dimensions | Paper Weight / Caliper | Enclosure Capacity | Internal Opacity | Sealing Chemistry | Royal Mail Tariff |
|---|---|---|---|---|---|---|
| 100gsm High-White Bond | 229 × 324 mm | 100gsm Uncoated Wove | Up to 40 unfolded A4 sheets | Blue Security Tint | Peel & Seal / Self-Seal | Large Letter (<25mm / 750g) |
| 120gsm Prestige Smooth Bond | 229 × 324 mm | 120gsm Luxury Corporate | A4 Folders & Glossy Brochures | Blue Security Tint | Peel & Seal (Hot-Melt) | Large Letter |
| Recycled Manila / Brown Kraft | 229 × 324 mm | 90gsm–115gsm Unbleached | Legal Archives & Official Files | Opaque Natural Fibres | Peel & Seal / Self-Seal | Large Letter |
| 360gsm Heavyweight All-Board | 229 × 324 mm | 360gsm (600 Micron Board) | Certificates, Art & Photos | 100% Solid Board | Peel & Seal + Rippa Strip | Large Letter / Parcel |
| C4 Scored Capacity Gusset | 229 × 324 + 25–50mm | 130gsm Heavy Kraft / Board | Thick Binders, Books & Bundles | Heavy Duty Opaque | High-Tack Peel & Seal | Large Letter / Small Parcel |
Product Overview: Professional C4 Envelope Printing for UK Businesses
When sending flat, unfolded A4 documents, high-impact presentation folders, financial audits, or glossy corporate brochures, folding paper simply isn't an option. High-volume business dispatches demand custom printed C4 envelopes (229 × 324 mm) built to protect contents during postal transit while displaying your brand logo, corporate identity, and return address clearly.
At Printways, our printed C4 envelopes UK service provides commercial enterprises, legal practices, public sector departments, and direct marketing agencies with trade press print across standard bond papers, unbleached eco-kraft, and 360gsm rigid board substrates. Formatted made for Royal Mail Large Letter compliance, our C4 229×324mm printed envelopes safely protect documents up to 25mm in thickness and 750g in gross weight within standard UK postal categories.
Whether you require cost-effective C4 envelope printing for routine invoicing and administrative dispatches or luxury branded C4 envelopes in 120gsm prestige bond for high-value client contracts, Printways delivers high-speed trade production with transparent online pricing and free UK mainland delivery.
Key Features & Product Options
1. Paper Stocks & Material Substrates
- C4 100gsm White Printed Envelopes: High-white uncoated bond with internal blue cross-hatch security hatching to keep private client documents fully opaque.
- 120gsm Prestige Smooth Bond: Heavyweight white paper designed for corporate executive dispatches, boardroom presentations, and luxury brand image.
- C4 Manila & Recycled Brown Kraft: Made from recycled unbleached kraft fibres. It gives sustainable performance for legal archives, government dispatches, and logistics fulfillment.
- C4 All-Board Mailers Printed: made from ultra-stiff 360gsm white-lined grey board or solid kraft board for non-bendable dispatches like certificates and art prints.
2. Envelope Style & Flap Architecture
- C4 Pocket Printed Envelopes: Opens on the shorter 229mm top edge. Pockets provide superior side-seam strength for multi-page custom C4 legal document envelopes and thick corporate reports.
- C4 Wallet Envelope Printing: Opens on the longer 324mm edge with a wide horizontal flap. Wallets allow fast manual loading of invoices, promo mailings, and catalogs.
- C4 Oversized & Capacity Gussets: Scored accordion gussets that expand from 25mm to 50mm depth to accommodate thick books, catalogues, ring binders, and multi-page legal trial bundles.
3. Sealing Mechanics
- C4 Peel and Seal Envelope Printing: Features a protective release paper strip over hot-melt adhesive. Offers a 24+ month shelf life and tamper-evident security.
- C4 Self-Seal Printed Envelopes: Pressure-sensitive latex strip on opposing flaps for immediate closing without moistening.
- Gummed Flap (Automated Inserters): Water-activated adhesive built made for automated mechanical mailing presses (Pitney Bowes, Quadient, Neopost).
4. Window & Non-Window Configurations
- C4 Window Printed Envelopes: Features a transparent window (39 ×. 93 mm or 45 ×. 90 mm) positioned on the bottom-left or bottom-right, displaying reader addresses directly from enclosed letters.
- C4 Non-Window Printed Envelopes: Provides an uninterrupted solid face for expansive logo printed C4 envelopes, full-color brand graphics, Postage Paid Impressions (PPI), and return address blocks.
Heavyweight Rigid Packaging: 360gsm All-Board Protection
For valuable items that must arrive without creasing—such as legal certificates, signed agreements, architectural plans, calendars, or art prints—standard paper mailers are not enough. Printways provides rigid packaging solutions built for maximum postal protection across the Royal Mail network.
C4 Rigid Cardboard Envelopes
Constructed with a 600-micron 360gsm board frame that resists bending, corner impacts, and crushing across courier transport networks.
Integrated Rippa-Strip Tear Tape
Equipped with permanent Peel &. Seal hot-melt strips and an integrated red rippa-strip for instant, tamper-evident, frustration-free customer opening.
Pre-Printed Warning Notices
Can be pre-printed with bold "PLEASE DO NOT BEND" notifications, return address blocks, and custom branding for elevated postal authority.
Trade Printing & Artwork Specifications
Printways operates specialized digital custom print lines and heavy offset litho presses capable of handling light paper as well as thick board substrates without feed jams:
- Full Colour C4 Printed Envelopes: High-definition 4-colour CMYK printing for high-impact promo marketing, logos, and corporate branding.
- C4 Trade Litho Printed Envelopes: High-volume offset runs (5,000 to 50,000+ units) using exact Pantone PMS spot color matching for accurate corporate identity print.
- Artwork Setup Requirements: Supply files as 300 DPI CMYK PDFs with 2mm bleed and fonts converted to outlines. Ensure a 5mm gripper margin along outer edges. Maximum recommended ink coverage is 35% across pre-converted stock (contact us for bespoke full-bleed quotes).
┌─────────────────────────────────────────────────────────────┐ │ PRINTWAYS C4 ARTWORK TEMPLATE │ │ │ │ ┌─────────────────────────────────────────────────────┐ │ │ │ ← 3mm Safe Zone (Keep text & logos inside) │ │ │ │ │ │ │ │ [ BRAND LOGO ] [ PPI / STAMP ] │ │ │ │ │ │ │ │ │ │ │ │ ┌───────────────────────────┐ │ │ │ │ │ OPTIONAL WINDOW APERTURE │ │ │ │ │ │ 39 x 93mm or 45 x 90mm │ │ │ │ │ └───────────────────────────┘ │ │ │ │ │ │ │ │ [ RETURN ADDRESS ] │ │ │ └─────────────────────────────────────────────────────┘ │ │ ← 5mm Gripper Margin along outer edges (No heavy ink) │ └─────────────────────────────────────────────────────────────┘
Simple 4-Step Trade Ordering Process
Order your custom printed C4 envelopes online in minutes with free pre-press verification.
Configure Specs
Choose size, paper weight (100gsm/120gsm/board), window position, seal type, and quantity.
Upload Artwork
Attach your 300 DPI CMYK PDF file, or select our professional graphic design service at checkout.
Approve Digital Proof
Our pre-press team reviews your file for resolution, safe zones, and gripper margins before printing.
Fast UK Delivery
Printed on high-speed trade presses and dispatched with tracked courier and free UK mainland shipping.
Explore All Custom Printed Envelope Variants
Compare UK postal formats, substrates, window layouts, and closure mechanics across our trade envelope catalogue.
Custom Printed C4 Envelopes: Product FAQs
Authoritative working answers to common questions about C4 dimensions, flap choices, and Royal Mail Large Letter postage rules.
What size sheet fits inside a standard C4 envelope?
Should I choose a C4 Pocket or a C4 Wallet format?
What is the shelf life of Peel &. Seal envelopes compared to Self-Seal?
How do custom C4 envelopes fit within Royal Mail postal limits?
Can I order bespoke legal mailers with variable reader addresses?
Ready to Upgrade Your Corporate A4 Mailings?
Join thousands of UK businesses, legal practices, and public sector offices that rely on Printways for trade-quality C4 envelope printing. Configure your order online with instant pricing or speak to our trade team.
Request Custom Quote
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Our Promise to You
Premium Quality
We use state-of-the-art printing tech and premium paper stocks to ensure every product meets the highest standards of quality.
Fast UK Delivery
With fast turnaround times and reliable UK-wide delivery, you can count on us to get your prints to you when you need them.
Expert Support
Our team of print experts is here to help you every step of the way, from choosing the right product to checking your artwork.
Complete Guide to Custom Printing
Ordering custom printed materials has never been easier. Whether you are a small business looking for fresh marketing print, or a large enterprise needing bulk commercial print runs, our online calculator ensures you get instant, transparent pricing. We pride ourselves on offering a wide variety of paper stocks, weights, and luxury finishes to make your project stand out from the competition.
How to Prepare Your Artwork
To ensure the highest quality print, please supply your artwork in PDF format. We recommend saving your files with the 'High Quality Print' preset. Here are a few essential tips for the perfect print:
- Bleed Area: Please include a minimum of 3mm bleed on all edges of your design. This ensures no white borders are left when we trim your product to the final size.
- Safe Zone: Keep all important text, contact details, and logos at least 3mm away from the trim edge.
- Resolution: All images and graphics should be supplied at 300dpi (dots per inch) for crisp, clear, and professional results.
- Colour Mode: Convert all RGB and spot colours to CMYK format before exporting your file to avoid unexpected colour shifts.
Understanding Paper Stocks & Finishes
Choosing the right paper stock can dramatically change the feel of your product. Here is a quick guide to our most popular options:
- Silk / Uncoated: A natural, non-reflective finish that is highly readable and easy to write on. Perfect for letterheads, forms, and elegant brochures.
- Gloss: A shiny coating that makes colours pop and images look incredibly vibrant. Ideal for flyers, posters, and photograph-heavy designs.
- Matt Lamination: A smooth, sleek finish that dulls reflections and adds a premium, tactile feel to business cards and luxury presentation folders.
- Spot UV & Foil: For maximum visual impact, add a glossy raised layer or metallic foil to specific parts of your design to draw the eye instantly.
Fast Delivery & Turnaround Times
We understand that business deadlines are critical. Our standard production times are clearly listed in the calculator options. Once printed, orders are carefully packed and dispatched via trusted overnight couriers to ensure they reach you safely and securely across the UK. You will receive a tracking link via email the moment your order leaves our production facility. It gives you complete peace of mind.