Tangshan Yinming Refractory Materials Co., Ltd. is a Chinese manufacturer focused on refractory materials for industrial furnaces and kilns, and calcium silicate insulation is one of the product families that overseas buyers ask about most often. Based in Tangshan, a region with a long tradition of ceramic and refractory production, the company pairs locally sourced minerals with modern forming, drying and machining equipment. Its wider catalogue covers fireclay bricks, high alumina bricks, insulating bricks, magnesia spinel bricks, acid-resistant bricks and ceramic fiber, which means a single purchase order can cover an entire furnace lining package. For project engineers, that consolidation reduces supplier risk, simplifies inspection and shortens the time between design and installation. This article explains what calcium silicate insulation actually is, how it performs, which formats and specifications are available, and how to specify the right grade for your kiln, boiler or pipeline. It also walks through customization, quality control, export packaging and the fastest way to obtain a quotation from the sales team.

Calcium silicate insulation is a rigid, inorganic thermal insulation material produced by reacting lime with silica in the presence of water under steam pressure, then forming the resulting slurry into boards, blocks or pre-shaped pipe sections. The finished product is white to off-white, dimensionally stable and completely non-combustible, which is why it appears in both thermal insulation and passive fire protection specifications. Unlike fibre blankets that compress under pressure, calcium silicate boards keep their shape and thickness under load, so the designed thermal resistance stays predictable for years. The material is also chemically inert in most furnace atmospheres and does not support mould growth, rodents or vermin. Its closed, crystalline structure limits capillary water absorption while still allowing residual moisture to escape during the first heat-up cycle. Because it contains no organic binders or hazardous fibres, calcium silicate board is a practical choice for projects with strict environmental or occupational health requirements. Yinming supplies this material as a complement to its dense refractory brick range, so contractors can build a complete multi-layer lining from hot face to cold shell.

From a performance standpoint, calcium silicate insulation is defined by a low thermal conductivity that typically ranges from about 0.06 to 0.10 W/m·K at mean temperatures of 200–400 °C, depending on density. Service temperature limits vary by grade, with standard products rated to roughly 650 °C and high-temperature grades reaching 1000 °C or more, so the specification must always state the actual hot-face temperature. Compressive strength is usually quoted between 0.4 and 1.5 MPa, which is enough to support cladding loads and resist handling damage during installation. Density normally falls between 170 and 250 kg/m³ for insulation grades, rising to around 400–600 kg/m³ for stronger structural boards. This combination of low density and moderate strength gives a very favourable strength-to-weight ratio compared with dense firebricks. The low weight also reduces the steel structure and foundation cost of a new furnace, and it lowers the risk of lining collapse during refurbishment. The engineers atAbout Us can advise which grade matches your specific temperature and load profile.

The first advantage of calcium silicate insulation is thermal efficiency. Because the material has a low thermal conductivity that stays stable across its working range, a thinner insulation layer can achieve the same heat loss target as a thicker mineral wool build-up, which saves space inside the furnace shell and reduces steel weight. The second advantage is high-temperature resistance. Rigid calcium silicate boards do not shrink, sag or melt at their rated service temperature, so the lining geometry stays intact after thousands of thermal cycles. The third advantage is the lightweight structure. With densities starting around 170 kg/m³, a calcium silicate board weighs a fraction of an equivalent-volume fireclay brick, which directly cuts transport cost and installation labour. The fourth advantage is durability: the material resists most acids, is unaffected by moisture during storage and does not corrode the steel it touches. The fifth advantage is easy installation, since boards can be cut on site with an ordinary hand saw, drilled, and fixed with anchors or ceramic studs. Finally, a properly installed calcium silicate lining delivers a long service life, often exceeding ten years in boiler and kiln back-up insulation duty.

Comparisons with alternative materials make these benefits concrete. Against ceramic fibre blanket, calcium silicate offers far better mechanical rigidity, so it does not compact behind anchors and does not create hot spots where the fibre thins. Against dense insulating firebrick, calcium silicate provides lower thermal conductivity at similar density and is available in much thinner sections, which is decisive when retrofitting an existing shell with limited cavity space. Against perlite or vermiculite blocks, it delivers higher strength and much better resistance to vibration, an important consideration for equipment near fans, mills or crushers. For export buyers, the material also has an advantage in logistics: it is stable, non-hazardous and not classified as a dangerous good, so shipping documentation stays simple. Yinming keeps a broad stock of standard thicknesses and can machine special shapes quickly, which reduces the lead time on repair orders. The fullProducts listing shows how calcium silicate sits alongside the company's other insulation and refractory lines.

Yinming's calcium silicate range covers the four formats most projects require: boards, pipe sections, blocks and customized shapes. Calcium silicate board is supplied in standard sheets from 600 × 1000 mm up to 1220 × 2440 mm, with thicknesses from 20 mm to 100 mm and tolerances held to ±1 mm on machined surfaces. Calcium silicate pipe sections come in pre-formed half-shells with wire or butt-joint sealing, sized to match standard pipe diameters from small utility lines up to large ductwork, and they are grooved so adjacent sections lock together tightly. Blocks are produced for furnace back-up linings and are often combined with dense brick on the hot face to create a graded lining. Customized shapes include burner quarls, door inserts, expansion joint fillers, ladle covers and precision-cut gaskets. Density options run from lightweight 170 kg/m³ insulation grades to strong 600 kg/m³ structural grades, and compressive strength is quoted to match each density band. Surface finishes can be supplied as-moulded, sanded or machined-to-drawing, depending on whether appearance or dimensional precision matters more for your application.

Specification discipline matters more than most buyers expect, so it is worth documenting five parameters on every enquiry: density, thickness, service temperature, compressive strength requirement and dimensional tolerance. A board that performs perfectly at 600 °C may need upgrading to a high-temperature grade at 950 °C, and the price difference is modest compared with the cost of an early lining failure. Thickness selection should be based on a heat-loss calculation rather than habit, because over-thick insulation adds weight and cost while under-thick insulation wastes energy every day of operation. Where the material will be walked on or used as a working platform, compressive strength becomes the governing property and a higher density grade is required. Where the board will be exposed to water or steam, the moisture behaviour of the specific grade should be confirmed before ordering. Yinming's technical team can review drawings and recommend a specification that balances performance against budget, and they will confirm availability of every size before the quotation is issued.

Calcium silicate insulation is used wherever heat must be contained without adding excessive weight or thickness. In industrial furnaces and heat treatment units, it serves as the back-up insulation behind dense fireclay or high alumina working linings, holding the steel shell temperature within safe limits. In ceramic and cement kilns, calcium silicate boards protect the kiln shell and reduce radiation losses in the preheating and cooling zones. Power plants specify calcium silicate pipe sections for steam and hot water lines, where the rigid half-shell format speeds up installation on long pipe runs and survives vibration better than soft insulation. Petrochemical plants use it around process heaters, reformers and high-temperature reactors, often with stainless steel cladding for weather protection. Steel plants apply it to ladle lids, tundish covers, reheat furnace walls and soaking pit doors. The material also appears in ship engine rooms, waste-to-energy boilers, aluminium holding furnaces and laboratory kilns, which shows how broadly the same technical advantages transfer across sectors.

Each application places slightly different demands on the insulation, and understanding those demands prevents costly mistakes. Furnace back-up linings prioritise low conductivity and dimensional stability at temperature, because the material must not shrink away from the hot face and leave a gap that fills with gas. Pipe insulation prioritises compressive strength and impact resistance, since the sections are handled repeatedly during installation and must resist cladding fasteners. Petrochemical service often adds a requirement for low chloride content to protect stainless steel from stress corrosion cracking, so the grade must be selected with the atmosphere in mind. Marine and offshore projects usually require documented non-combustibility and, in some cases, third-party approval of the fire performance. Repair work in steel plants prioritises fast availability, because a single day of furnace downtime can cost more than the insulation itself. Yinming keeps standard sizes ready for urgent replacement orders and can prioritise production for shutdown schedules once the details are confirmed, and the company'sNews page regularly covers furnace efficiency topics relevant to these decisions.

Standard catalogue sizes solve most of a project, but the awkward remaining 10 % usually decides whether an installation runs smoothly. Yinming therefore offers full customization on calcium silicate board, pipe and block formats, working directly from customer drawings in PDF, DWG or hand-sketched form. Custom sizes, non-standard thicknesses, chamfers, grooves, stepped edges and complex cut-outs are all achievable with CNC machining and purpose-built moulds. The company also supports technical drawing review, so a buyer can send a furnace lining layout and receive a marked-up drawing showing recommended board positions, joint offsets and anchor spacing. Physical samples are available before bulk production, which lets site teams confirm cuttability, weight and fit on a small scale. For distributors and private-label brands, OEM support includes custom marking, neutral packaging, printed labels and buyer-specific carton design. This is particularly valuable for contractors who resell insulation under their own brand and need consistent presentation across shipments.

Quality control at Yinming begins before production, with incoming inspection of lime, silica and reinforcing fibre to confirm chemical composition and purity. During production, the mixing ratio, slurry density, forming pressure and steam curing cycle are all monitored and recorded, because small deviations in the curing schedule directly affect strength and thermal conductivity. Finished product testing covers density, compressive strength, flexural strength, thermal conductivity and linear shrinkage at rated temperature, with results compared against the specification agreed on the order. Dimensional inspection checks length, width, thickness, squareness and pipe-section radii against drawing tolerances. Where projects require documentation, the company can supply material test certificates, SGS test reports and batch traceability records that link delivered goods back to production logs. These documents matter for buyer-side inspection, insurance compliance and end-client acceptance, so they should be requested at the quotation stage rather than after shipment. For buyers with their own inspection protocols, third-party inspection during production or before loading can be arranged on request.

Calcium silicate is light but brittle at the edges, so packaging design has a direct impact on how much usable material arrives at the site. Yinming packs boards in strong export cartons or wooden crates with corner protection, stacks them on fumigation-free pallets, and wraps full pallets in stretch film and strapping to prevent movement inside the container. Pipe sections are nested and bundled with end protection so the half-shell edges stay intact during handling. Loading plans are prepared in advance so that heavy dense bricks are stowed away from fragile insulation, and container space is used efficiently to reduce freight cost per cubic metre. Delivery time depends on whether the order is standard stock or custom production, and the sales team confirms a firm date with the quotation so buyers can plan site works accordingly. Export support covers shipping coordination, booking, and preparation of commercial invoice, packing list, certificate of origin and any certificate the destination customs authority requires. For buyers new to importing from China, the team can also recommend incoterms and consolidation options that keep landed cost predictable.

Choosing correctly comes down to five practical questions, and answering them before you send an enquiry will save at least one round of revisions. First, what is the maximum continuous service temperature at the hot face, including any excursion conditions during start-up or upset? Second, what heat loss or shell temperature must be achieved, because that calculation sets the minimum thickness. Third, what compressive or flexural load will the insulation carry, whether from cladding, foot traffic, vibration or adjacent refractory weight? Fourth, what is the chemical environment, including moisture, steam, acid vapour, alkali attack or chloride exposure that could affect the grade selection? Fifth, how will the material be installed, with anchors, studs, adhesive, cladding or a combination, since the fixing method determines the required strength and surface finish? Documenting these five answers turns a vague request into a specification the factory can quote accurately.

Beyond those technical questions, commercial considerations also shape the right choice. If the project is a one-off repair, buying standard sizes and cutting on site is usually faster and cheaper than ordering custom shapes. If the project is a repeat build, investing in moulds and pre-cut kits pays back quickly through reduced labour hours and less waste. If storage space on site is limited, thinner boards in a higher-performance grade may be better than thick boards that require a large laydown area. If the site is humid, confirm the moisture behaviour and drying schedule before installation so the lining is not sealed wet. If the installation crew has limited experience with rigid insulation, ask for an installation guide or a short technical briefing, which Yinming can provide with the order. Getting these details right the first time is the difference between a lining that lasts a decade and one that needs patching within a year.

The fastest route to an accurate quotation is a single enquiry containing five elements: product format, dimensions, quantity, temperature requirement and destination port. Product format means board, pipe section, block or custom shape, and for pipes the inner diameter and length per section should be stated. Dimensions should include thickness, and drawings are ideal where geometry is not standard, because a sketch removes ambiguity that no email exchange can fully resolve. Quantity should reflect the actual installed area plus a realistic cutting and breakage allowance, typically five to ten percent for boards and slightly more for machined shapes. Temperature requirement should state the continuous service temperature rather than a nominal furnace rating, and the application helps the technical team sanity-check the grade. Finally, the destination port or city determines freight and packing method, which are significant cost lines for light, bulky insulation. Send these details through theSupport page or to the sales contacts listed there, and a formal quotation with specification, packing details and delivery estimate follows.

Calcium silicate insulation is a rigid, inorganic material made by reacting lime with silica under steam pressure and then forming the slurry into boards, blocks or pipe half-shells. It contains no organic binder and no hazardous fibres, so it is non-combustible and chemically stable in most furnace atmospheres. Because it holds its shape under load, it is used both for thermal insulation and for passive fire protection.

Standard calcium silicate board grades are typically rated to around 650 °C, while high-temperature grades reach 1000 °C or more depending on composition and density. The correct grade must be selected against the continuous hot-face temperature, not just the nominal furnace rating. Always state your maximum service temperature and any excursion conditions when requesting a quotation.

It is a good replacement wherever mechanical rigidity and dimensional stability matter, because rigid calcium silicate boards do not compress behind anchors or thin out into hot spots. Ceramic fibre remains preferable in highly irregular cavities and where very low weight is the dominant requirement. Many linings combine both materials, using calcium silicate as the structural back-up layer and fibre for gap filling.

Minimum order quantities depend on whether you need standard stock sizes or custom production, and they are stated clearly in the quotation. Standard board and pipe sizes can often be supplied in smaller trial quantities so buyers can verify performance on a real installation. Custom shapes require a mould, so the economic minimum is higher and is quoted case by case.

Yes, physical samples are available so buyers can confirm density, weight, cuttability and fit before committing to a bulk order. Samples of standard grades are usually dispatched quickly, while custom-machined samples follow the drawing approval stage. Courier costs for samples are normally borne by the buyer and can be credited against the first bulk order.

Standard sizes from stock usually ship within a short window, while custom production requires additional time for moulds, forming, curing and machining. The firm delivery date is confirmed with the quotation and depends on order volume, specification complexity and the shipping schedule. Where a shutdown deadline is fixed, tell the sales team early so production can be prioritised.

Yes, full OEM support is available, including custom sizes, special shapes, buyer-specific marking and private-label packaging. Production can follow customer drawings in PDF, DWG or sketch form, with a drawing review before manufacturing begins. This suits distributors, contractors and brands that resell insulation under their own label.

Shipments are accompanied by a commercial invoice, packing list and certificate of origin, plus material test certificates covering density, strength and thermal conductivity. SGS test reports and batch traceability records can be supplied where the project requires third-party verification. Additional inspection or certification requested by the buyer can be arranged if agreed at the quotation stage.

Boards are packed in export cartons or wooden crates with corner protection and stacked on fumigation-free pallets. Pipe sections are nested and bundled with end protection to keep the half-shell edges intact. Loading plans separate fragile insulation from heavy dense bricks, and full pallets are strapped and film-wrapped to prevent movement in transit.

Payment terms are agreed per order and typically follow standard export practice with a deposit and balance against shipping documents. After-sales support covers installation guidance, technical clarification and resolution of any specification or quality question after delivery. Buyers are encouraged to raise concerns immediately on arrival so any issue can be investigated with the production batch records.

Whether you are building a new kiln, refurbishing a boiler, or reselling insulation under your own brand, Tangshan Yinming Refractory Materials Co., Ltd. can supply calcium silicate insulation alongside the dense bricks and ceramic fiber needed for the complete lining. The sales team can send a full product catalogue, technical data sheets for each grade, and samples so your engineers can verify performance before the bulk order. Quotes are prepared against your drawings, temperature requirements and destination, which keeps pricing accurate and avoids surprises at shipment. Buyers who are comparing suppliers are welcome to request SGS test reports and batch records as part of the evaluation. Start from theHome page to see the full product range and company profile, then send your specification for a fast, detailed quotation.