Hey everyone, thanks for stopping by my corner of the blog—today we’re diving into something I get asked about all the time, especially by new print buyers and packaging folks who just started working with boards: what actually goes into making C1s ivory board? As a supplier who’s been in this game for over a decade, I’ve walked through every step of the process from raw bale to finished sheet, so I’m gonna keep this real, no fancy jargon that makes your head spin. A lot of people think it’s just “paperboard made of tree pulp” but there’s a lot more nuance there, especially for C1s grade, which is that super smooth, single-side coated ivory board everyone uses for luxury boxes, book covers, greeting cards, and that fancy product packaging you see on high-end skincare or snacks. C1s Ivory Board
First off, let’s get the basics of C1s out of the way quick, so we’re all on the same page. “C1s” stands for “one side coated” — that means only one face is coated to get that crisp, printable, slightly glossy finish, while the other is uncoated, matte, and slightly textured, which is perfect for laminating, gluing, or just stacking without sticking. The ivory part comes from that bright, warm off-white color, not stark bleached white, which is way easier on the eyes for long print runs and looks way more premium than plain white board.
Now, the star of the show here is pulp, right? But not just any pulp. C1s ivory board needs to be strong enough to hold its shape when folded into a box, smooth enough for high-resolution printing, and consistent color, so we can’t cut corners here. The main raw material we use is virgin hardwood pulp — wait, don’t get scared, virgin doesn’t mean they cut down old-growth forests. Most of the virgin hardwood pulp we source is from sustainable, FSC-certified tree farms, specifically fast-growing species like eucalyptus and birch. Why those two? They have super long fibers that give the board its rigidity and tear resistance, but they’re also soft enough to break down into a smooth pulp that makes that perfect ivory color without needing too much extra dye. I’ve worked with other suppliers who mix in a bunch of recycled pulp to cut costs, but for true C1s grade, recycled pulp is only allowed in the core layers, not the outer coated side or the top inner layer. If you use recycled pulp for the coating side, you get all that random fiber bits, ghost marks from old newspaper ink, and inconsistent color that makes the board look cheap.
Wait, hold on, let’s break down the layers because that’s another big thing people miss about ivory board. It’s not a single sheet of pulp — it’s a multi-ply board, usually three or four layers thick, each with a different job. The inner core is 100% recycled pulp, usually from post-consumer paper like old catalogs, office paper, and even old corrugated boxes that are too damaged to reuse. That core is what gives the board its bulk and structural strength — we need that to make sure a luxury wine box doesn’t collapse when you stack 12 of them. The inner face (the side that’s not coated, remember) is a mix of 70% virgin hardwood pulp and 30% recycled pulp, that’s the transition layer between the core and the top coating. That helps the coating stick better, right? If you put the coating directly on the recycled core, all those old ink residues and surface irregularities would mess up the coating’s finish, so that middle layer is a must.
Now, the coating — this is where the “ivory” and the “C1s” magic happens. The coating is a super thin, precise layer (only like 10 to 15 microns thick, that’s way thinner than a human hair) that’s applied only to one side, hence C1s. What’s in that coating? The base is a mix of kaolin clay and calcium carbonate, two super common, totally safe minerals that give the board its smooth, bright, printable surface. Kaolin clay is that soft white clay you probably used in school as a kid — it’s perfect for filling in tiny gaps between pulp fibers to make a totally smooth surface that ink adheres to evenly. Calcium carbonate, on the other hand, is what makes up most of limestone, and it helps adjust the color to that warm ivory we want, not too blue, not too yellow.
But wait, it’s not just clay and chalk in that coating. We add a bunch of specialty additives to make the board perform the way people need it to. First, we use a small amount of latex, which is basically synthetic rubber, to make the coating flexible so it doesn’t crack when we fold the board into a box. If you didn’t have latex, that smooth coated side would split right down the fold line when you run it through a die cutter for packaging. Then there are optical brightening agents (OBAs) — not the scary kind you see in some cheap laundry detergents, just chemical compounds that make the ivory color look brighter under both natural and artificial light, so when you print a black logo on it, it pops no matter where the product is displayed. We also add a tiny bit of water repellent, usually a plant-based wax emulsion, to make the board resistant to small spills and moisture, so a greeting card or a product box doesn’t warp if it gets splashed with a drink or sitting in a humid warehouse.
Wait, I mentioned earlier that some suppliers cut corners, so let’s talk about what’s not in our C1s ivory board, because that’s a common question from buyers. We never use old-growth timber for our virgin pulp — all our sources are FSC or PEFC certified, which means for every tree we harvest, two more are planted in its place. That’s non-negotiable for me, both because it’s the right thing for the planet, and because sustainable grown trees produce way more consistent pulp than old, mature trees that are more brittle and variable. We also don’t use any toxic chemicals in the coating that would make the board unsafe for food contact, if that’s what a customer needs — we have a food-grade version of our C1s board that meets FDA and EU food safety standards, no lead, no heavy metals, no weird solvents. A lot of cheap ivory boards use recycled pulp for the coating side that has trace amounts of old ink or chemical contaminants, so that’s why paying for genuine C1s grade is worth it, not just a random off-white paperboard.
Let me also clear up a myth I hear all the time: people think ivory board is just thick paper. No, way — standard C1s ivory board ranges from 170 gsm (grams per square meter, that’s the thickness measurement for paper and board) up to 400 gsm, which is almost twice as thick as a standard sheet of printer paper. The 170 gsm is perfect for thin book covers or postcards, while the 350-400 gsm is what we use for luxury rigid packaging. That thickness comes from the multi-ply structure, not just one layer of thick pulp. I’ve had customers come to me saying they bought “ivory board” from another supplier that was only 200 gsm but felt flimsy — that’s because they used a single layer of mixed pulp, not the three-ply structure we use.
Wait, let’s walk through a quick, simplified version of how these raw materials get turned into the finished board, just to make it make sense. First, we process the virgin hardwood pulp into a slurry, same with the recycled core pulp. We layer them: core on the bottom, inner layer, then coat one side with that clay/calcium carbonate mix, press all the layers together to squeeze out excess water, dry it in huge ovens, then calender it (run it through heated rollers) to make the coated side super smooth, then cut it into the standard sizes people need. All of this is done in a closed loop system, so almost 95% of the water used in the process is recycled, we barely discharge any wastewater back into local rivers. That’s another thing I pride myself on as a supplier — we’re not just making a product, we’re making it responsibly.
Now, why does this matter for you, the buyer or user? If you’re a small business owner making custom packaging, the raw materials directly affect how your product looks and performs. If your board is made with low-quality recycled pulp on the coated side, your print won’t be crisp, the color will look dull, and your box might get damaged in transit. If you use a board that’s too thin, even if it’s called C1s, it won’t hold its shape, and customers will notice. I had a client last year who switched from a cheap overseas supplier to ours because their boxes were getting rejected by their luxury brand clients for being flimsy and having uneven print. Within a month, their return rate for packaging issues dropped by 60%, all because we use consistent, high-quality raw materials.
Another thing I get asked: can we use other raw materials if a customer needs a custom grade? For example, if someone wants a higher strength board for heavy product packaging, we can add a small amount of long-fiber softwood pulp to the core layers, no problem. If someone wants a more muted ivory color, we can adjust the amount of calcium carbonate in the coating to make it warmer, not brighter. We also have options for uncoated back sides if you need to laminate it to another material, like plastic or wood, for custom rigid boxes.
Wait, let’s make sure I don’t skip over any key raw materials people might not think about. The chemicals used in the process are strictly regulated, right? We use nothing that would leave a residual odor, which is super important for products like food packaging, cosmetics, or children’s greeting cards. A lot of cheap boards have a faint chemical smell because they use low-grade additives, but our C1s ivory board is completely odor-free, tested by independent labs, so you don’t have to worry about that.
Now, I know I talked a lot about materials, but let’s wrap this up with why this whole process is what makes C1s ivory board such a versatile, high-value product. It’s not just a paper product — it’s a combination of sustainable wood pulp, recycled paper, natural minerals, and safe additives, all engineered to give you that smooth, bright, rigid board you need for everything from print projects to premium packaging.
If you’re looking to source genuine C1s ivory board for your next project, whether you’re a small business making custom boxes, a printer working on a book run, or a brand launching a new product line, I’d love to chat. We can tailor the grade, size, and even the raw material specs to fit your exact needs, no hidden fees, no generic off-the-shelf stuff that doesn’t work for your project. Just reach out to me directly to discuss your requirements.
I’ve been in this industry long enough to know that not all ivory board is created equal, and the difference comes down to the raw materials. Skip the cut-rate stuff that uses subpar pulp and coatings, go with a supplier that’s transparent about what goes into every sheet.
Specialty Paper References:
- TAPPI Standard T402: Composition of Paper and Paperboard, 2022
- Forest Stewardship Council (FSC) Certified Fiber Sourcing Guidelines, 2023
- European Paper Industries Association (CEPI): Sustainable Pulp and Paper Production Report, 2022
- Food and Drug Administration (FDA): Food Contact Substances for Paper and Paperboard, 2021
- International Organization for Standardization (ISO) 536: Paper and Board – Determination of Grammage, 2019
Dongguan Banyan Material Co., Ltd.
We are one of the most experienced c1s ivory board manufacturers and suppliers in China, also support customized service. Please feel free to wholesale bulk eco-friendly c1s ivory board from our factory. Quality products and reasonable price are available.
Address: NO.167, Meijing West Road, Songmushan, Dalang Town, Dongguan City, Guangdong Province, China
E-mail: Sales_chris@yspaper.com
WebSite: https://www.paperyoung.com/
