{"id":84638,"date":"2026-04-21T03:32:45","date_gmt":"2026-04-21T03:32:45","guid":{"rendered":"https:\/\/www.alalloycasting.com\/?p=84638"},"modified":"2026-04-21T03:32:45","modified_gmt":"2026-04-21T03:32:45","slug":"ceramic-fiber-paper-thickness-grades-gasket-applications","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/ar\/ceramic-fiber-paper-thickness-grades-gasket-applications\/","title":{"rendered":"Ceramic Fiber Paper for Aluminum Industry: Thickness, Grades & Gasket Applications"},"content":{"rendered":"

What Is Ceramic Fiber Paper and What’s It Made Of?<\/h2>\n

Ceramic fiber paper is a thin, flexible sheet material manufactured from refractory ceramic fibers \u2014 the same alumina-silica chemistry that forms the backbone of ceramic fiber blanket and board, but processed into a paper-like form through a wet-laid papermaking process. The fibers get dispersed in water, formed into a uniform sheet on a moving wire mesh, then dried and calendered to produce a smooth, consistent product that’s surprisingly tough given how light it feels in your hand.<\/p>\n

The fiber composition typically runs 44\u201347% alumina (Al\u2082O\u2083) and 51\u201354% silica (SiO\u2082) for standard grades, with higher-alumina and zirconia-enriched variants pushing performance further up the temperature scale. Organic binders \u2014 usually starch or latex \u2014 are added during formation to give the paper handleability and green strength. These burn out during the first heat cycle, leaving a purely inorganic structure that’s chemically stable at operating temperature.<\/p>\n

What you end up with is a product that weighs somewhere between 80 and 200 grams per square meter, comes in thicknesses from 1mm to 6mm, and handles like heavy cardboard until it gets hot. Typical roll widths run from 300mm to 1220mm, with roll lengths from 10 to 30 meters depending on thickness. You can cut it with scissors, punch it with a die, or stamp it into gaskets on standard papermaking equipment \u2014 which is exactly why it’s so useful for precision applications where blanket or board would be overkill.<\/p>\n

At AdTech, ceramic fiber paper is produced in standard 1260\u00b0C and high-alumina 1430\u00b0C grades, with both standard density (128\u2013160 kg\/m\u00b3) and high-density variants available.<\/p>\n

 If your project requires the use of ceramic fiber paper, you can contact us for a free quote. <\/span><\/strong><\/em><\/a><\/p>\n

\"\u0648\u0631\u0642
\u0648\u0631\u0642 \u0627\u0644\u0623\u0644\u064a\u0627\u0641 \u0627\u0644\u062e\u0632\u0641\u064a\u0629<\/em><\/figcaption><\/figure>\n

How Does Ceramic Fiber Paper Differ From Ceramic Fiber Blanket and Board?<\/h2>\n

This question comes up constantly, and the confusion is understandable \u2014 they’re all made from the same basic fiber chemistry. The difference is in the manufacturing process, the resulting physical form, and consequently the applications each product suits.<\/p>\n

 \u0628\u0637\u0627\u0646\u064a\u0629 \u0645\u0646 \u0627\u0644\u0623\u0644\u064a\u0627\u0641 \u0627\u0644\u062e\u0632\u0641\u064a\u0629 <\/span><\/a><\/strong><\/em> is needle-punched, which gives it thickness, loft, and compressibility. It’s the right choice for wrapping irregular shapes, filling large insulation volumes, and applications where you need a significant insulation thickness. But blanket is bulky \u2014 minimum practical thickness is around 25mm \u2014 and it’s genuinely difficult to die-cut into precise shapes without fraying.<\/p>\n

 Ceramic fiber board <\/span><\/strong><\/em><\/a> is vacuum-pressed into rigid panels. It has structural strength and won’t sag or deform under its own weight. The trade-off is that it’s not flexible and doesn’t conform to curved surfaces without special forming.<\/p>\n

 Ceramic fiber paper <\/span><\/a><\/strong><\/em> occupies territory that neither blanket nor board can reach. At 1\u20136mm thickness, it handles applications where space is at a premium. It’s flexible enough to conform to curved surfaces and wrap around cylindrical components. It die-cuts cleanly into gaskets, seals, and complex shapes. And because the wet-laid process produces a more uniform fiber distribution than needle-punching, its thermal properties are more consistent across the sheet.<\/p>\n

Think of it this way: blanket insulates large volumes, board provides rigid structural insulation, and paper handles the precision work \u2014 thin-section gasketing, interlayer insulation in layered refractory systems, die-cut components for appliance manufacturing, and any situation where you need high-temperature insulation in a tight space.<\/p>\n

What Temperature Can Ceramic Fiber Paper Handle?<\/h2>\n

Grade selection matters here just as much as it does for rope or board. The classification temperature of ceramic fiber paper follows the same ASTM C892 \/ EN 1094-1 framework used for other refractory ceramic fiber products, but the thinner cross-section means the paper reaches thermal equilibrium faster than thicker products \u2014 it heats through quickly, so it’s exposed to the full operating temperature almost immediately.<\/p>\n

\n\n\n\n\n\n\n\n\n
Grade<\/th>\nFiber Chemistry<\/th>\n\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0635\u0646\u064a\u0641<\/th>\nRecommended Continuous Use<\/th>\nLoss on Ignition (LOI)<\/th>\n<\/tr>\n<\/thead>\n
Standard (STD)<\/td>\nAl\u2082O\u2083 ~45%, SiO\u2082 ~53%<\/td>\n1050\u00b0C (1920\u00b0F)<\/td>\n900\u00b0C<\/td>\n8\u201312%<\/td>\n<\/tr>\n
High-Purity (HP)<\/td>\nAl\u2082O\u2083 ~47%, SiO\u2082 ~52%, low Fe\u2082O\u2083<\/td>\n1260\u00b0C (2300\u00b0F)<\/td>\n1100\u00b0C<\/td>\n6\u201310%<\/td>\n<\/tr>\n
High-Alumina (HA)<\/td>\nAl\u2082O\u2083 ~52\u201355%, SiO\u2082 ~43\u201346%<\/td>\n1400\u00b0C (2550\u00b0F)<\/td>\n1200\u00b0C<\/td>\n5\u20138%<\/td>\n<\/tr>\n
Zirconia-Enriched (HZ)<\/td>\nAl\u2082O\u2083 ~36%, SiO\u2082 ~49%, ZrO\u2082 ~15%<\/td>\n1430\u00b0C (2600\u00b0F)<\/td>\n1250\u00b0C<\/td>\n4\u20137%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Classification temperatures and LOI values per ASTM C892 and ASTM C871 (Standard Test Methods for Chemical Analysis of Refractory Materials). LOI reflects organic binder content burned off during first heat cycle.<\/em><\/p>\n

The loss on ignition figure is worth paying attention to. When the organic binders burn out during first use, the paper loses mass and undergoes minor dimensional change \u2014 typically less than 1% linear shrinkage for HP-grade paper at 1000\u00b0C. Applications where dimensional stability through the first cycle matters (precision gaskets, for instance) should account for this during design. AdTech’s HP-grade paper is formulated to minimize LOI while maintaining sufficient green strength for handling and die-cutting.<\/p>\n

Where Is Ceramic Fiber Paper Actually Used in Industry?<\/h2>\n

The application list for ceramic fiber paper is longer and more diverse than most people realize. I’ve come across it in places you wouldn’t immediately expect.<\/p>\n

Gasket manufacturing.<\/strong>\u00a0This is probably the largest single application by volume. Die-cut ceramic fiber paper gaskets show up in industrial ovens, laboratory furnaces, kiln inspection ports, and heat treatment equipment. The material cuts cleanly with steel-rule dies on standard die-cutting presses, making it economical to produce high volumes of identical gaskets. Tolerances of \u00b10.5mm are routinely achievable, which is good enough for the vast majority of furnace flanges and door frames.<\/p>\n

Interlayer insulation in multi-layer refractory systems.<\/strong>\u00a0When you’re building up a composite refractory lining \u2014 say, a hot-face castable backed by ceramic fiber board backed by a microporous panel \u2014 ceramic fiber paper often gets used as a slip layer between the rigid components. It fills surface irregularities, provides a modest additional insulation contribution, and allows the layers to move relative to each other during thermal cycling without cracking.<\/p>\n

Expansion gap filling in ceramic and kiln furniture.<\/strong>\u00a0Ceramic kiln shelves and posts expand when heated. Without provision for that expansion, they crack or buckle. Thin strips of ceramic fiber paper placed between stacked kiln furniture components absorb differential expansion and prevent the pieces from locking together and cracking during cooling.<\/p>\n

Backup insulation in aluminum casting equipment.<\/strong>\u00a0In launders, troughs, and transition pieces that channel molten aluminum between furnace and mold, ceramic fiber paper gets used as a conformable backing layer beneath precast refractory shapes. It fills gaps that would otherwise allow heat to bypass the primary insulation. This ties directly into AdTech’s broader work in\u00a0aluminum casting and molten metal handling systems.<\/p>\n

Appliance and HVAC manufacturing.<\/strong>\u00a0Domestic and commercial ovens, dryers, and industrial heating equipment use ceramic fiber paper as door gaskets and internal insulation sheets. The material’s ability to be stamped and formed on standard production equipment makes it attractive for high-volume appliance manufacturing.<\/p>\n

Protective wrapping for heating elements and thermocouples.<\/strong>\u00a0Resistance heating elements in industrial furnaces are sometimes wrapped with a layer of ceramic fiber paper to prevent direct radiation damage to the furnace lining immediately behind them. Thermocouple sheaths get similar treatment where they pass through the furnace wall.<\/p>\n

Electronics and semiconductor manufacturing.<\/strong>\u00a0High-purity, low-iron grades of ceramic fiber paper serve as separator sheets in semiconductor diffusion furnaces where contamination from iron or alkali metals must be minimized.<\/p>\n

What Are the Key Physical Properties of Ceramic Fiber Paper?<\/h2>\n

Getting specific about the numbers is important when you’re actually specifying this material for an engineering application. Here’s where HP-grade ceramic fiber paper typically lands across its key properties:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
\u0627\u0644\u0639\u0642\u0627\u0631\u0627\u062a<\/th>\n1mm Thickness<\/th>\n3mm Thickness<\/th>\n6mm Thickness<\/th>\nTest Standard<\/th>\n<\/tr>\n<\/thead>\n
\u0627\u0644\u0643\u062b\u0627\u0641\u0629 \u0627\u0644\u0638\u0627\u0647\u0631\u064a\u0629<\/td>\n128\u2013160 kg\/m\u00b3<\/td>\n128\u2013160 kg\/m\u00b3<\/td>\n128\u2013160 kg\/m\u00b3<\/td>\nASTM C167<\/td>\n<\/tr>\n
Tensile Strength (MD)<\/td>\n0.15\u20130.25 MPa<\/td>\n0.18\u20130.28 MPa<\/td>\n0.20\u20130.30 MPa<\/td>\nASTM D828<\/td>\n<\/tr>\n
Thermal Conductivity @ 400\u00b0C<\/td>\n0.10\u20130.12 \u0648\u0627\u0637\/\u0645\u00b7\u0643\u0644\u0641\u0646<\/td>\n0.10\u20130.12 \u0648\u0627\u0637\/\u0645\u00b7\u0643\u0644\u0641\u0646<\/td>\n0.10\u20130.12 \u0648\u0627\u0637\/\u0645\u00b7\u0643\u0644\u0641\u0646<\/td>\nASTM C177<\/td>\n<\/tr>\n
Thermal Conductivity @ 800\u00b0C<\/td>\n0.18\u20130.22 W\/m\u00b7K<\/td>\n0.18\u20130.22 W\/m\u00b7K<\/td>\n0.18\u20130.22 W\/m\u00b7K<\/td>\nASTM C177<\/td>\n<\/tr>\n
Max. Linear Shrinkage @ 1000\u00b0C<\/td>\n<1.0%<\/td>\n<1.0%<\/td>\n<1.0%<\/td>\nASTM C356<\/td>\n<\/tr>\n
Temperature Classification<\/td>\n1260 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td>\n1260 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td>\n1260 \u062f\u0631\u062c\u0629 \u0645\u0626\u0648\u064a\u0629<\/td>\nASTM C892<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Physical property data represents typical values for AdTech HP-grade ceramic fiber paper. Actual values may vary by \u00b110% depending on batch. Independent verification available upon request for quality-critical procurement.<\/em><\/p>\n

A few things jump out from that table. The thermal conductivity values \u2014 0.10\u20130.12 W\/m\u00b7K at 400\u00b0C \u2014 are competitive with much thicker insulation products. That’s the nature of the material: even a 3mm sheet provides meaningful thermal resistance. The tensile strength numbers look modest in absolute terms, but for a 3mm paper-form product, they’re actually quite good \u2014 enough to handle without tearing during normal installation.<\/p>\n

Can Ceramic Fiber Paper Be Cut, Formed, and Fabricated?<\/h2>\n

Yes, and this fabricability is genuinely one of its best selling points. Unlike ceramic fiber board, which requires power tools to cut, and unlike ceramic fiber blanket, which frays and sheds fibers if you try to cut it with anything less than a sharp knife, ceramic fiber paper behaves like \u2014 well, like paper. Within reason.<\/p>\n

Hand cutting.<\/strong>\u00a0Sharp scissors or a utility knife cut 1\u20133mm paper cleanly. For 6mm paper, a straightedge and a fresh utility knife blade gives clean edges without tearing.<\/p>\n

Die cutting.<\/strong>\u00a0This is where ceramic fiber paper really shines. Standard steel-rule dies on flatbed cutting presses stamp out gaskets and seals in high volumes with consistent dimensions. The material doesn’t gum up dies, doesn’t require lubrication, and produces clean cut edges with minimal fiber fraying. Most gasket manufacturers who work with high-temperature materials have die-cutting operations set up for ceramic fiber paper.<\/p>\n

Punching.<\/strong>\u00a0Hole punches, both manual and hydraulic, work well for producing bolt holes in gaskets. For high-volume production, custom punch presses turn out hundreds of identical gaskets per hour.<\/p>\n

Forming and wrapping.<\/strong>\u00a0The 1mm and 2mm grades are flexible enough to wrap around cylinders, pipes, and curved surfaces without cracking. Thicker grades can be bent around gentle curves but will crack on tight radii \u2014 try to keep the bend radius above 100mm for 6mm paper.<\/p>\n

Laminating.<\/strong>\u00a0Ceramic fiber paper can be laminated to metallic foil, glass cloth, or other facing materials using high-temperature inorganic adhesives. These composite products add surface protection and improve handleability in applications where the bare paper might abrade or tear during installation.<\/p>\n

\"ceramic
ceramic paper be cut\u3001formed\u3001fabricated<\/em><\/figcaption><\/figure>\n

How Does Ceramic Fiber Paper Perform as a Gasket Material?<\/h2>\n

Gasket performance comes down to three things: sealing effectiveness under compression, resistance to blowout at operating pressure, and long-term stability so the gasket doesn’t require constant re-torquing. Here’s how ceramic fiber paper stacks up on each count.<\/p>\n

Compression sealing.<\/strong>\u00a0Ceramic fiber paper compresses readily under bolt load, flowing into surface irregularities and microscopic imperfections on flange faces. It doesn’t require high bolt loads to achieve an effective seal \u2014 important when you’re working with thin cast iron or ceramic flanges that can crack under excessive torque.<\/p>\n

Blowout resistance.<\/strong>\u00a0Paper-form ceramic fiber isn’t designed for high-pressure service. In furnace and kiln applications \u2014 which typically operate at slightly negative pressure (draft) or very low positive pressures \u2014 blowout isn’t a concern. If your application involves gauge pressures above about 0.5 bar, you’d want to look at reinforced ceramic fiber sheet or a metal-jacketed gasket instead.<\/p>\n

Long-term stability.<\/strong>\u00a0This is where ceramic fiber paper outperforms organic-binder-based gasketing materials like compressed fiber sheet (CFG). Above 300\u00b0C, CFG oxidizes and hardens, eventually losing its compressibility and allowing flange joint leakage. Ceramic fiber paper, once its organic binder has burned out in the first heat cycle, is purely inorganic and maintains its properties indefinitely at operating temperature \u2014 no oxidation, no carbonization, no hardening.<\/p>\n

\u0627\u0644\u0640\u00a0U.S. Department of Energy’s Better Plants program<\/a>\u00a0has identified high-temperature gasket performance as a meaningful factor in industrial energy efficiency, noting that leaking furnace joints can increase energy consumption by 5\u201315% in susceptible equipment types.<\/p>\n

AdTech Real Case: Upgrading a Japanese Ceramic Kiln Manufacturer’s Production Line<\/h2>\n

In mid-2024, a specialty ceramics manufacturer based in Aichi Prefecture, Japan, approached AdTech with a specific and somewhat unusual problem. The company produced fine technical ceramics \u2014 alumina substrates, zirconia components, and silicon carbide structural parts \u2014 in a line of continuous pusher kilns running at peak temperatures of 1400\u00b0C.<\/p>\n

Their existing interlayer insulation between kiln furniture components was a domestic fiberglass paper product rated to 700\u00b0C. During a routine process audit, their quality engineer noticed that the fiberglass paper was completely disintegrating above the transition zone in their kilns, where temperatures exceeded 800\u00b0C. Fragments of degraded fiberglass were contaminating the kiln atmosphere and, in some cases, adhering to the surfaces of sintered ceramic components \u2014 which caused rejection rates in their high-purity alumina substrate line to spike from a baseline of 2.3% to over 7% during certain production runs.<\/p>\n

The contamination source wasn’t immediately obvious \u2014 the failed fiberglass paper fragments were small and only showed up under microscopic surface inspection. It took their quality team three months to trace the rejects back to the kiln furniture insulation.<\/p>\n

AdTech recommended our\u00a0HA-grade ceramic fiber paper (1400\u00b0C classification, 3mm thickness, 160 kg\/m\u00b3 density)<\/strong>. The high-alumina grade was specified \u2014 rather than standard HP-grade \u2014 because the kiln peak temperature of 1400\u00b0C left very little safety margin for the HP grade. The low iron content of our HA paper (Fe\u2082O\u2083 under 0.3%) was also critical, since iron contamination is particularly damaging in alumina substrate sintering.<\/p>\n

The customer ordered an initial trial quantity of\u00a02,400 square meters<\/strong>\u00a0in 300mm \u00d7 600mm pre-cut sheets, sized to match their kiln furniture dimensions and minimize on-site waste. AdTech also supplied a small quantity of 1mm HA-grade paper for use as slip sheets between stacked components in their shuttle kilns.<\/p>\n

Results after 90 days:<\/p>\n