Views: 213 Author: Weishi Sheets Publish Time: 2026-10-11 Origin: Site
Content Menu
● Why Source Mica Sheets from China?
>> An Established International Supply Base
>> Manufacturing Clusters Support Different Applications
● How We Selected the Suppliers
● Understanding Mica Sheet Specifications
>> Natural Mica and Reconstituted Mica Are Not Interchangeable
>> Define the Finished Material, Not Just the Mineral
>> Understand the Limits of Compliance Claims
● Top 10 Mica Sheets Manufacturers and Supply Partners in China
>> 1. Guangdong Weishi New Materials Co., Ltd.
>> 2. Pamica Technology Corporation
>> 3. Zhejiang Rongtai Electric Material Co., Ltd. — Glory Mica
>> 4. Hubei Zhongtian Mica Products Co., Ltd.
>> 5. HighMica
>> 6. Yangzhou Yinlong Insulation Materials Co., Ltd.
>> 7. Jiaxing ST New Materials Co., Ltd.
>> 8. Suzhou Taihu Electric Advanced Material Co., Ltd.
>> 9. Ningbo Kaxite Sealing Materials
>> 10. Cixi Aiflon Sealing Materials Co., Ltd.
● Supplier Comparison: Capacity, MOQ, and Certification
● Buyer's Guide to Mica Sheet Procurement
>> Verify Manufacturing Responsibility
>> Approve Samples in Three Stages
>> Compare Cost per Accepted Component
>> Specify Packaging and Customs Requirements
● Common Procurement Pitfalls and an Overlooked Safeguard
>> Undefined Temperature Claims
>> Unapproved Material Changes
>> Test Results That Cannot Be Linked to Delivered Material
>> 1. How Can I Verify Whether an ISO Certificate Is Expired or Suspended?
>> 2. How Can I Confirm That the Delivered Material Is the Approved Mica Grade?
>> 3. Does a RoHS Report or CE Document Prove Application Suitability?
>> 4. Can Mica Sheets Replace FR4, G10, or G11 Without Redesign?
>> 5. How Can I Confirm That Advertised Capacity Will Support My Contract?
China offers a diverse manufacturing base for mica sheets, mica insulation boards, and precision-fabricated insulation components. Its suppliers range from integrated mica specialists to broader composite-material manufacturers serving electrical equipment, industrial machinery, heating systems, and new-energy applications.
For professional procurement teams, this diversity creates opportunities—but also makes supplier qualification more demanding.
Two suppliers may quote the same thickness and temperature rating while offering different mica types, binder systems, manufacturing methods, or inspection standards. A competitive price is useful only when the delivered material performs consistently in the intended application.
The most important purchasing principle is traceability. Buyers should be able to connect an approved sample, its material specification, and its test results to the batches delivered during regular production.
This guide introduces ten China-based manufacturers and supply partners, compares their disclosed capabilities, and explains how to evaluate quality, customization, compliance, and delivery reliability.
The USGS Mineral Commodity Summaries 2026 reports that China supplied 73% of U.S. sheet-mica imports during 2021–2024. Estimated U.S. sheet-mica imports reached 5,100 metric tons in 2025, compared with 4,520 metric tons in 2024.
These figures demonstrate China's established role in international mica supply, but they need careful interpretation.
The USGS category includes several classifications of natural and worked mica, including agglomerated or reconstituted products. It does not represent a standalone market-size estimate for rigid industrial mica insulation boards.
For buyers, the practical advantage is access to multiple manufacturing models:
- Integrated mica-paper and finished-product manufacturers.
- Application-focused producers serving batteries, appliances, and electrical systems.
- Multi-material insulation suppliers offering mica and epoxy fiberglass products.
- Sealing manufacturers supplying mica-based thermal-insulation components.
Several Chinese manufacturing locations offer useful supplier concentrations.
Tongcheng in Hubei hosts mica specialists such as Pamica and Hubei Zhongtian. Jiaxing in Zhejiang hosts Zhejiang Rongtai and Jiaxing ST New Materials. Jiangsu includes manufacturers serving mica processing and broader electrical-insulation applications.
Guangdong adds access to composite-material manufacturers such as Weishi, whose portfolio emphasizes epoxy fiberglass materials and customized insulation components.
The right sourcing location depends on the project. A heater support plate, battery thermal barrier, and motor-insulation component may require different manufacturing expertise.
The following criteria provide a transparent framework for comparing suppliers. Comparable audited information is not available for every company, so this guide does not assign numerical scores.
| Evaluation area | Evidence to request | Purchasing significance |
|---|---|---|
| Manufacturing identity | Business license, factory address, production-flow description | Establishes who manufactures the product |
| Technical expertise | Grade-specific datasheets, formulation information, relevant application experience | Supports appropriate material selection |
| Quality control | Incoming inspection, thickness checks, electrical testing, batch records | Helps control production consistency |
| Capacity and delivery | Product-specific output, utilization, production schedule | Tests whether capacity is available for the buyer's order |
| Compliance | Current certificates and material-specific reports | Reduces documentation and market-access risks |
| Customization | Drawing review, tolerance capability, tooling plan, sample procedure | Supports repeatable OEM production |
| Commercial support | Response time, corrective-action process, forecast management | Indicates suitability for long-term cooperation |
A missing public capacity figure is not automatically a weakness. It means the figure must be obtained directly.
Likewise, a certification logo on a website is not sufficient evidence that a current certificate covers the factory and production process involved in the order.
"Mica sheet" can describe several different products.
Natural mica sheets are produced from mineral splittings. Reconstituted mica sheets commonly use mica paper or splittings bonded into a manufactured insulation material. Some constructions include reinforcement.
These differences influence flexibility, thickness, machining behavior, and application suitability.
The IEC 60371 series distinguishes between materials and end uses. IEC 60371-3-1 addresses commutator separators and related materials. IEC 60371-3-3 addresses rigid mica materials for heating equipment.
A quotation stating only "complies with IEC" is therefore incomplete. The supplier should identify the relevant part, edition, material type, and test basis.
Muscovite and phlogopite are common commercial mica types. Suppliers often position muscovite for electrical-insulation applications and phlogopite for higher-temperature service.
However, mineral type alone does not establish finished-board performance.
Buyers should specify:
- Mica type and material construction.
- Binder chemistry.
- Reinforcement, where applicable.
- Thickness and tolerance.
- Electrical-test conditions.
- Thermal exposure duration.
- Mechanical loading.
- Dimensional and edge-quality requirements.
A temperature rating is useful only when the supplier explains what it measures and what properties remain acceptable after exposure.
ISO certification, substance-compliance evidence, and CE marking serve different purposes.
An ISO management-system certificate does not certify every individual product. A substance-test report does not demonstrate thermal endurance. CE marking is not a universal quality label for raw insulation materials.
For any compliance claim, request the supporting document and check the company name, manufacturing site, product identification, scope, issue date, and validity.
| Company detail | Publicly available information |
|---|---|
| Established | October 2007 |
| Location | Heyuan, Guangdong |
| Product focus | Epoxy fiberglass and composite insulation materials; mica sheets listed among product categories |
| Application focus | Electronics, electrical equipment, machinery, and industrial insulation |
| Geographic markets | Geographic sales distribution not publicly detailed |
| OEM support | Design adaptation and processing of insulation components |
Weishi is particularly relevant to buyers seeking a combination of insulation materials rather than mica sheets alone.
Its portfolio emphasizes FR4, G10, G11, and related composite products. The company also states that it can develop or modify customer designs for mass production.
Publicly reported resources include more than 16,000 square meters of building area, ten engineers, more than sixty technical staff, and monthly output exceeding 100 tonnes. That output covers the broader composite-material operation and should not be interpreted as verified mica-sheet capacity.
For small and medium-sized OEMs, Weishi's potential value lies in coordinated material selection, customized processing, and support for projects involving different insulation components.
Its communication efficiency and cost competitiveness should be evaluated through a drawing-review exercise, sample quotation, and pilot order.
Qualification priority: Confirm whether the requested mica grade is manufactured in-house, externally sourced and processed, or supplied through a production partner. Request mica-specific capacity, MOQ, inspection documentation, and lead times.
| Company detail | Publicly available information |
|---|---|
| Established | Current corporate entity established in 2015; earlier operating milestones date to 2000 |
| Location | Tongcheng, Hubei |
| Product focus | Mica paper and finished mica insulation products |
| Market focus | Global high-temperature electrical and thermal-insulation applications |
| Customization | Mica sheets, washers, heaters, and new-energy insulation products |
Pamica is relevant to buyers seeking an integrated mica supply chain.
Its public company history describes mica-paper production, fiberglass-cloth operations, and finished insulation products. An upstream mica-paper operation is reported to have annual output of 15,000 metric tons.
That figure refers to mica paper, not finished rigid mica sheets.
Pamica also published a 2025 mica supply-chain due-diligence report in July 2026. Procurement teams can use it as a starting point for reviewing sourcing practices and supply-chain transparency.
Qualification priority: Request finished-sheet capacity, grade-specific traceability, inspection procedures, and the due-diligence evidence relevant to the proposed material source.
| Company detail | Publicly available information |
|---|---|
| Established | 1998 |
| Location | Jiaxing, Zhejiang |
| Product focus | High-temperature insulating mica products |
| Market focus | Domestic and international vehicle, appliance, cable, rail, and industrial applications |
| Customization | Application-specific insulation and thermal-protection solutions |
Rongtai is worth evaluating for projects requiring application development rather than straightforward sheet supply.
Its website reports more than fifty R&D personnel, over one hundred intellectual-property rights, and a research center exceeding 3,000 square meters.
The company describes customized solutions for battery thermal-runaway management, appliances, and rail applications.
These capabilities may support technically demanding projects. Buyers must still verify the construction and performance of the exact proposed material.
Qualification priority: Confirm grade-specific available capacity, production-site responsibility, change-control procedures, and application-relevant testing.
| Company detail | Publicly available information |
|---|---|
| Established | 2001, according to its supplier profile |
| Location | Tongcheng, Hubei |
| Product focus | Mica sheets, paper, tape, tubes, gaskets, and fabricated parts |
| Geographic markets | Geographic sales distribution not confirmed |
| Customization | Multiple mica product forms and processed components |
Zhongtian offers a broad mica product portfolio that may suit buyers ordering both sheet stock and finished insulation parts.
Its supplier profile reports facilities exceeding 30,000 square meters, more than fifty engineers, and annual output of 6,000 tonnes of mica products.
These are company-reported figures covering mica products generally, not confirmed available capacity for a specific sheet grade.
ISO 9001 is listed in its supplier profile. Buyers should obtain the current certificate and verify its validity and scope.
Qualification priority: Separate rigid-sheet output from other products and inspect representative machined components.
| Company detail | Publicly available information |
|---|---|
| Established | 2007, according to its website |
| Location | China; contracting entity and production address require clarification |
| Product focus | Mica sheets, tubes, gaskets, and insulation components |
| Market focus | More than fifty countries and regions, according to the company |
| Customization | Industrial mica components in multiple product forms |
HighMica reports a factory exceeding 6,000 square meters, more than 150 employees, and annual output of 8,000 tonnes of mica products.
Its website also claims ISO 9001:2015 certification and RoHS/REACH-related compliance.
The product range makes it a potential contact for industrial buyers requiring several mica component types.
Before evaluating commercial terms, resolve the legal manufacturing identity. The names on the contract, certificate, bank account, test report, and factory documentation should be consistent or clearly explained.
Qualification priority: Verify the legal entity, capacity claims, and grade-specific compliance evidence.
| Company detail | Publicly available information |
|---|---|
| Established | Not confirmed in the reviewed public information |
| Location | Yangzhou, Jiangsu |
| Product focus | Mica sheets, mica tubes, fabricated parts, and epoxy fiberglass insulation |
| Market focus | Electrical equipment and industrial insulation |
| Customization | Processing of mica and other insulation components |
Yinlong describes itself as a manufacturer and processor of insulation and mica-tube products.
Its combination of mica and epoxy fiberglass materials may suit buyers seeking coordinated sourcing for thermal and structural insulation.
The website states annual output value of RMB 30 million. This is a financial output measure, not physical production capacity.
Qualification priority: Request the establishment record, equipment list, current certification documents, and a machining trial based on the actual drawing.
| Company detail | Publicly available information |
|---|---|
| Established | 2007 |
| Location | Jiaxing, Zhejiang |
| Product focus | Mica sheets, rolls, tubes, parts, heaters, and related insulation products |
| Market focus | Europe and the United States, according to its profile |
| Customization | Multiple electrical- and thermal-insulation product forms |
Jiaxing ST presents a broad insulation offering and identifies export experience serving European and U.S. customers.
Its product mix may be useful for consolidated purchasing across several insulation categories.
However, its supplier listing identifies both manufacturing and trading activities. Buyers should establish which operations are performed internally and which involve external manufacturers.
Qualification priority: Map responsibility for material formulation, lamination, machining, inspection, and corrective action.
| Company detail | Publicly available information |
|---|---|
| Established | 1986 |
| Location | Suzhou, Jiangsu |
| Product focus | Resins, mica products, flexible composites, and laminated insulation materials |
| Market focus | Electrical-insulation systems, including wind-turbine and high-voltage motor applications |
| Customization | Integrated insulation-system solutions |
Taihu is more relevant to insulation-system procurement than to a simple commodity-board comparison.
Its industry profile describes R&D and production across several complementary insulation-material categories.
This breadth can be valuable where mica must work within a wider electrical-insulation system.
Qualification priority: Confirm that the company supplies the required standalone rigid mica sheet or fabricated component. Experience with winding insulation should not automatically be treated as evidence of suitability for every heater-board application.
| Company detail | Publicly available information |
|---|---|
| Established | Not confirmed in the reviewed public information |
| Location | Ningbo, Zhejiang |
| Product focus | Natural mica sheets and shaped components |
| Market focus | Industrial electrical and thermal-insulation applications |
| Customization | Rectangular, circular, oval, and other requested forms |
Kaxite's reviewed product information describes hard natural mica sheets for sight-glass applications, electrical insulation, washers, gaskets, and heater elements.
It may be particularly relevant for thin natural mica components.
This positioning should not be confused with high-volume manufacturing of thick reconstituted mica boards.
Qualification priority: Identify the quoted construction before comparing price or performance with other suppliers.
| Company detail | Publicly available information |
|---|---|
| Established | Exact founding year not confirmed |
| Location | Cixi, Zhejiang |
| Product focus | Sealing products and thermal-insulation materials, including mica sheets |
| Market focus | Middle East, United States, and Europe, according to its website |
| Customization | OEM/ODM sealing products and mica sheets to customer requirements |
Aiflon describes a manufacturing structure that includes sealing-product manufacturers and heat-insulation factories.
Its website states more than thirty years of OEM/ODM experience, while its mica product information indicates supply according to customer requirements.
It may suit buyers purchasing mica alongside gaskets and other thermal-insulation materials.
Qualification priority: Verify the actual production site, material construction, and suitability for electrical insulation as well as thermal service.
"Not disclosed" means the reviewed public information did not establish a usable figure. It does not mean the supplier lacks the capability.
| Supplier | Published capacity information | MOQ information | Certification or compliance evidence |
|---|---|---|---|
| Weishi | 100+ tonnes/month across composite products; mica allocation unconfirmed | Not disclosed | Mica-specific documents require verification |
| Pamica | 15,000 tonnes/year for an upstream mica-paper operation | Not disclosed | Published 2025 supply-chain due-diligence report |
| Rongtai | Comparable rigid-sheet capacity not established | Not disclosed | Current site and grade documents required |
| Zhongtian | 6,000 tonnes/year of mica products, supplier-profile claim | Not disclosed | ISO 9001 listed; current validity requires verification |
| HighMica | 8,000 tonnes/year of mica products, website claim | Not disclosed | ISO 9001:2015 and RoHS/REACH-related claims |
| Yinlong | Output value disclosed; physical capacity not established | Not disclosed | Current documents required |
| Jiaxing ST | Not disclosed | Not disclosed | Current documents required |
| Taihu | Rigid-sheet capacity not disclosed | Not disclosed | Current documents required |
| Kaxite | Not disclosed | Product page advertises any quantity; terms require confirmation | Current documents required |
| Aiflon | Mica-specific capacity not disclosed | Not disclosed | Current documents required |
Send each supplier the same specification. Request separate quotations for stock sheets, custom thicknesses, machined parts, tooling, and packaging.
Request the business license, production address, process map, and details of subcontracted operations.
A factory walkthrough should show the processes relevant to the order—not simply general production equipment.
Where a supplier sources material externally, determine who controls the formulation, inspection, and change-management process.
Use a structured qualification sequence:
1. Material sample: Confirm construction, thickness, and relevant properties.
2. Fabricated sample: Inspect dimensions, holes, slots, edges, and assembly fit.
3. Pilot production: Evaluate repeatability under normal production conditions.
Define acceptance criteria before testing. A visually attractive sample is not a substitute for application validation.
Sheet price alone can conceal additional costs.
Include:
- Usable material yield.
- Machining expense.
- Tooling charges.
- Inspection requirements.
- Rejection rate.
- Packaging and freight.
- Potential production disruption.
A slightly higher sheet price may be commercially preferable if it produces more accepted finished components.
Agree on edge protection, sheet support, moisture protection where appropriate, and pallet loading.
Request shipment photographs and a clear transit-damage claims process.
Customs classification also depends on product construction. Natural mica and worked or reconstituted mica can fall under different headings. Confirm the appropriate classification for the actual product and destination.
Ask whether the stated rating describes short-term exposure, continuous operation, or mineral stability.
Also define the property that must remain acceptable after exposure. Electrical insulation, dimensional stability, and mechanical support are different requirements.
A supplier may change mica type, binder, reinforcement, paper construction, or production source.
Identify the approved material by grade and revision. Require written approval before any relevant substitution.
A valid laboratory report is useful only when its relationship to the shipment is clear.
For critical orders, require:
- Coupons from the shipment's identified production batch.
- A recorded sampling procedure.
- Matching batch IDs on packaging and inspection documents.
- Retained reference samples.
- Notification of formulation or process changes.
This safeguard addresses a practical gap: the supplier may have tested a suitable material, but the buyer still needs evidence that the delivered batch matches it.
China's mica supply base includes integrated specialists, application-development manufacturers, multi-material insulation producers, and sealing-focused suppliers.
The most suitable partner depends on the material construction, operating conditions, customization requirements, and documentation needed for the project.
For programs combining mica insulation with FR4, G10, or G11 components, Guangdong Weishi New Materials Co., Ltd. is a relevant starting point. Its broader composite-material portfolio and design-to-production support can help buyers coordinate different insulation requirements.
Send Weishi your drawings, operating-temperature profile, voltage requirements, material specifications, and expected order volumes. Request a documented material recommendation, sample plan, and quotation identifying manufacturing responsibility, tolerances, inspection criteria, and delivery terms.
Search the exact legal company name or certificate details in IAF CertSearch, then compare the listed site and scope with the factory supplying the order.
Check the certificate status, issuing body, and covered activities.
If the information is missing or unclear, contact the issuing certification body directly. A scanned certificate alone does not resolve questions about current validity or manufacturing scope.
Use an approved construction specification, batch-linked inspection records, and retained reference samples.
For critical applications, agree with a qualified laboratory on appropriate identification and performance tests.
Do not use color alone as an acceptance criterion. Prohibit unapproved changes to the mica type, binder, reinforcement, and production source.
No.
Substance compliance, regulatory conformity, and application performance are separate issues.
CE marking applies only where relevant legislation requires it. Even properly documented material must still be validated for the equipment's voltage, temperature, loading, environment, and intended service life.
Do not treat these materials as direct substitutes.
Changing the material system may affect mechanical support, fastening, machining, electrical performance, and dimensional behavior.
Request an application review and requalify the finished component under representative operating conditions.
Request available capacity for the exact grade, thickness, and processing route.
Review production utilization, bottleneck equipment, maintenance schedules, and contingency plans.
Start with a pilot order and evaluate actual delivery performance before increasing allocation. Company-wide output is not the same as capacity reserved for your purchase order.
1.USGS, Mineral Commodity Summaries 2026: Natural Mica. Official government information on mica production, consumption, trade, and import-source statistics. [pubs.usgs]
2.IEC 60371-3-3: Rigid Mica Materials for Heating Equipment. Technical specification addressing relevant rigid mica materials. [webstore.iec]
3.IEC 60371-3-1: Commutator Separators and Materials. Specification illustrating application-specific distinctions within mica insulation materials. [cdn.standards.iteh]
4.European Commission: CE Marking. Official guidance on the purpose and legal scope of CE marking. [single-market-economy.ec.europa]
5.IAF CertSearch. Verification platform for accredited management-system certification. [iafcertsearch]
6.Guangdong Weishi New Materials Co., Ltd. Company website and publicly stated manufacturing capabilities. [wsepoxysheet]
7.Pamica Technology Corporation. Company history, product information, and 2025 mica supply-chain due-diligence publication. [pamica]
8.Zhejiang Rongtai Electric Material Co., Ltd. Company capabilities, applications, and establishment information. [en.glorymica]
9.Hubei Zhongtian Mica Products Co., Ltd. Public supplier profile and reported manufacturing information. [zhongtianmica.en.made-in-china]
10.HighMica. Company website and reported factory, capacity, and compliance information. [highmica]
11.Yangzhou Yinlong Insulation Materials Co., Ltd. Company and product information. [ylinsulated-mica]
12.Jiaxing ST New Materials Co., Ltd. Company profile and manufacturing/trading classification. [linkedin]
13.Suzhou Taihu Electric Advanced Material Co., Ltd. Industry exhibition profile and insulation-system capabilities. [berlin.cwiemeevents]
14.Kaxite Sealing. Natural mica sheet product information. [seal-china]
15.Cixi Aiflon Sealing Materials Co., Ltd. Company information and mica-sheet customization offering. [aiflon]
