EcoCorker supplies precision granulated cork (also known as cork granules or cork granulate) for industrial and commercial applications. As a Custom Cork Granulated Manufacturer, we focus on tight granulometry control, repeatable quality, and configurable blends for OEM/ODM buyers across insulation, composites, gaskets, flooring underlayment, sports infill, and horticulture. This guide explains material fundamentals, grades, specs, applications, compliance, and how to choose the right granulate for your project.
As a granulated cork manufacturer and cork granules supplier, EcoCorker operates a cork granulate factory delivering OEM cork granules and bulk cork granules for international buyers as an export wholesale supplier. We also act as a custom granulated cork supplier, cork crumb manufacturer, and cork aggregate supplier for diverse industries, offering cork particles for composites and end‑to‑end cork granulation services to meet tight specifications and private‑label needs.
What Is Granulated Cork?
As a sustainable cork material derived from renewable oak bark, our FSC-certified cork options support responsible sourcing and traceability. Our team is informed by the long tradition of the Portuguese cork industry, while maintaining a global supply and compliance footprint.
Granulated cork is cork oak (Quercus suber) bark that is carefully processed into particles with defined size ranges. After harvesting (a renewable process that does not fell the tree), bark is cleaned, processed, and granulated before sieving/screening to pass exact size fractions. The resulting cork granules retain cork’s hallmark properties—very low density, elastic recovery, acoustic damping, and low thermal conductivity—making them an excellent lightweight composite filler and insulation medium.
Granulate vs. Powder vs. Agglomerate
- Granulated cork: controlled particle sizes (e.g., 0.25–0.5 mm, 0.5–1.0 mm, 1–2 mm, 2–4 mm); best for fillers, underlayment, infill, and composite mixes.
- Cork powder: much finer particulate for resin systems that demand very smooth texture or specific surface area behavior.
- Agglomerated cork: granules bound with a polymer or suberin-based binder to create sheets, blocks, or molded shapes (e.g., cork-rubber gasket sheets, insulation boards, stoppers). This includes agglomerated cork granules, expanded cork granules, and polyurethane-bonded cork systems where required. We also supply binder-free cork granules where the agglomeration step is performed in your process.
Grades & Particle Sizes
EcoCorker offers standard granulometry ranges along with custom sieving and blended fractions for performance tuning. Typical size bands include:
- Extra fine: 0.25–0.5 mm
- Fine: 0.5–1.0 mm
- Medium: 1–2 mm
- Coarse: 2–4 mm
- Custom: as specified (tight tolerance sieving and mixed-fraction blends available)
Application pointers
- Underlayment & acoustic mats: fine to medium fractions for consistent compaction and sound attenuation.
- Epoxy flooring & resin composites: fine and extra fine for smooth finishes and predictable dispersion.
- Gaskets & cork‑rubber: fine to medium depending on compressibility target and binder system.
- Artificial turf infill & horticulture: medium to coarse for drainage, resilience, and handling.
Tip: If your design balances flow, compaction, and surface finish, consider a dual-fraction blend (e.g., 30% extra fine + 70% fine) to improve packing density without overloading binder viscosity. Our sieving and screening process delivers consistent particle size distribution, with custom sieved cork granules and tight tolerances available on request. As a lightweight cork aggregate and cork crumb provider for composites and cementitious mixes, we also supply cork particles for composites and lightweight concrete additives. Our sieving and screening process delivers consistent particle size distribution, with custom sieved cork granules and tight tolerances available on request.
Technical Specifications & Quality Control
Our position as a Custom Cork Granulated Manufacturer is built on measurable, lot‑specific data. Your order ships with a Technical Data Sheet (TDS) and may include a Certificate of Analysis (COA) on request.
Key properties (reported per TDS)
- Granulometry: particle size distribution by sieve analysis (e.g., ISO 3310 series for test sieves; method reported on TDS)
- Bulk density: indicative for handling, dosing, and composite formulation
- Moisture content: controlled during processing and packing to stabilize performance
- Ash content: cleanliness indicator for certain applications
- Elastic recovery / compressibility: relevant for underlayment and gasket design
- Thermal behavior: cork is typically around ~0.04 W/m·K in low-density forms (measured via recognized methods, e.g., ISO 8302/ASTM C177—method referenced on TDS)
- Acoustic performance: absorption/damping trends discussed where appropriate (e.g., ISO 354 for sound absorption reporting—when applicable)
Test & compliance notes
- REACH: materials supplied in line with EU Regulation (EC) No 1907/2006
- RoHS: directive 2011/65/EU (and amendments) applicability declared for relevant industrial uses
- ISO 9001: quality management systems for production and traceability
- FSC® Chain of Custody: available for specified lines when requested (FSC-STD-40-004)
In practice, our ISO 9001 factory supplies REACH compliant materials and RoHS compliant products with detailed technical data sheets and particle size distribution reports for every specified grade, with moisture content control and bulk density of cork consistently profiled per granulometry.
Engineering guidance: For resin systems, start with binder-to-filler ratios validated in your lab and adjust based on target viscosity, compaction, and weight. Cork’s low density significantly alters volumetric fill compared to mineral fillers.
Applications & Performance
Cork granules excel where lightweight, resilience, and damping matter. Below are the most common end uses and how to size/select:
Acoustic & Thermal Insulation
- Underlayment beneath laminate and engineered wood flooring to reduce impact sound (ΔLw) and improve comfort.
- Insulation boards (with binders) or loose-fill systems in specialty designs.
- Recommended sizes: fine to medium for consistent compaction, balanced airflow, and stability.
- Why cork: naturally low thermal conductivity, vibration isolation, and elastic recovery under cyclical loading.
This makes cork an effective acoustic dampening media for underlayment soundproofing in residential and commercial projects.
Resin & Polymer Composites
- Epoxy/polyurethane flooring: cork as a lightweight composite filler to tune density, softness, and shock absorption.
- Thermoplastic compounds: in masterbatches for lightweight parts with tactile warmth.
- Recommended sizes: extra fine and fine for smooth surfaces; medium where texture is desired.
- Processing notes: pre‑drying may help moisture‑sensitive systems; evaluate surface treatment if compatibility is critical.
Cork functions as a lightweight composite filler; optimize your particle size distribution to balance viscosity, flow, and mechanical targets. Typical downstream uses include composite plastic injection molding masterbatches, shoe sole manufacturing, fishing rod handle composites, and lightweight cork aggregate for epoxy flooring and other resin systems.
Gaskets & Sealing (Cork‑Rubber)
- Automotive and industrial gasket sheets combine cork granules with NBR/EPDM/SBR binders for compressibility and oil resistance.
- Recommended sizes: fine to medium; select granulometry to balance compressibility, sealing, and mechanical strength.
- Design tip: request tight particle size tolerance for repeatable compression set.
For certain designs, cork‑rubber granules and polyurethane‑bonded cork deliver repeatable compression set and oil resistance.
Sports Infill & Horticulture
- Artificial turf infill: medium cork granules offer a cooler surface temperature than some rubber infills and a natural feel.
- Horticulture: mixed with substrates to improve aeration and drainage while keeping weight low.
- Handling: choose medium to coarse for reduced dust and consistent spread rates.
Select cork infill granules for turf systems and medium/coarse blends for horticulture focused on soil aeration and drainage.
Lightweight Concrete & Flotation
Cork granules can act as lightweight concrete additives to reduce density while improving thermal behavior, and low density cork granules are sometimes used in niche flotation devices; validate performance through trials aligned with your standards.
Decorative Surfaces & Design
- Acoustic panels, wall finishes, craft surfaces: cork’s visual warmth and texture create distinctive aesthetics. Custom colored cork granules are available for branded or decorative applications.
- Recommended sizes: tailor to the desired texture; consider colored granules on request.
Compliance, Documentation & Certifications
EcoCorker supports enterprise procurement with transparent documentation. On request, we can provide COA, SDS/MSDS, and FSC chain‑of‑custody documentation for eligible lines.
- Quality management: ISO 9001-aligned production and batch traceability
- REACH: compliance statements for EU Regulation (EC) No 1907/2006
- RoHS: declarations for applicable product lines
- FSC®: FSC-STD-40-004 chain-of-custody options when specified
- Food-grade cork options: available for specified use cases upon qualification
- Testing references: ISO 8302/ASTM C177 (thermal); ISO 354 (acoustics); sieve analysis method stated on each TDS
Note: Specific certifications apply to defined SKUs or production lots. We support customers in Europe with FSC-certified granulated cork on eligible lines and can prepare region‑specific documentation to streamline audits and market access.
Packaging, Handling & Logistics
- Packaging formats: 25 kg sacks and big bags (bulk) are common; other formats available by request.
- Labeling: product code, granulometry, lot number, and net weight for traceability.
- Storage: keep sealed, in a dry environment away from direct moisture and heat to preserve moisture content stability.
- Global shipping: export-ready with commercial invoice, packing list, and HS code; Incoterms as agreed.
- MOQ & lead time: depend on granulometry and customization; we’ll confirm current availability during quoting.
We support low MOQ pilot runs, palletized shipping, and transparent price per ton quotations for international buyers. As an export wholesale supplier, we prepare full documentation and can align packaging to distributor or private label needs. We routinely ship granulated cork in 25 kg bags for export and big bags (bulk) for container loads.
Sustainability & Traceability
Cork is a renewable, natural material harvested cyclically from cork oak without felling the tree. Responsible management supports biodiversity in Mediterranean ecosystems. With FSC® chain-of-custody options, EcoCorker can align supply to your ESG requirements.
- Circularity: cork can be recycled and upcycled; we support take-back discussions for large, recurring programs.
- Carbon considerations: cork’s low density and natural origin can contribute to lower embodied impact versus many mineral fillers; evaluate with your LCA goals.
- Traceability: lot coding and supplier documentation facilitate audits and sustainability reporting.
Where circularity goals apply, we can incorporate or supply recycled cork granules and collaborate on end‑of‑life or take‑back schemes for recurring programs.
Buyer’s Guide: Choosing the Right Cork Granulate
Step 1 — Define the application. Acoustic underlayment? Epoxy flooring? Gaskets? Turf? Horticulture? Each use implies a different balance of granulometry, moisture, and density.
Step 2 — Pick a granulometry. Start with the range that suits your process (e.g., 0.5–1.0 mm for smooth resin finishes). Consider blends for better packing.
Step 3 — Validate density & moisture. Request TDS/COA and run a small trial to dial binder ratios and compaction.
Step 4 — Align compliance. Confirm REACH/RoHS/FSC needs and whether a food-contact option is required.
Step 5 — Plan logistics. Choose 25 kg sacks or big bags; set reorder points around your curing schedule and warehouse conditions.
Selection quick tips
- Use fine fractions for smooth surfaces and tight seals; medium for balanced flow and compaction; coarse for drainage and texture.
- For resin systems, pre‑condition granules to stable moisture before dosing.
- In gaskets, pair fine/medium cork with the appropriate elastomer (NBR, EPDM) to reach the targeted compression set.
If you’re comparing industrial cork granulate options, our team can help specify technical cork granules by application; EcoCorker acts as a responsive granulated cork supplier with global export capability. As an industrial cork granulate exporter in Asia, we support rapid quoting and documentation for international tenders.
OEM/ODM & Private Label Services
As a Custom Cork Granulated Manufacturer, EcoCorker supports:
- Custom sieving & granulometry blends (tight tolerances)
- Binder‑ready granules for specific resin or elastomer systems
- Colored granules for decorative surfaces
- Private label packaging and labeling
- Cork granulation services for specific particle size targets
- Documentation kits (TDS, SDS/MSDS, sample COA) and technical onboarding for new lines
Process
- Share application, target properties, and annual volume.
- We propose granulometry options (single or blends) and a sampling plan.
- Run trials; iterate on size/density/moisture.
- Lock QA tests and documentation for series production.
FAQs
Q1. Granulated cork vs. cork powder—what’s the difference?
Granulated cork uses controlled particle sizes for flow and compaction; cork powder is finer, suited to ultra‑smooth resin systems or specific surface-area requirements.
Q2. Which size is best for epoxy flooring?
Start with 0.5–1.0 mm for a smooth finish and predictable dosing. Use extra fine if you need a more uniform surface, and medium if you want texture.
Q3. What is the typical thermal conductivity of cork products?
Low by nature; cork-based materials commonly report around ~0.04 W/m·K in low-density forms (verify your exact value via TDS/third‑party testing such as ISO 8302/ASTM C177).
Q4. Can you match my sieve curve or blend tolerance?
Yes. Provide your target particle size distribution (by % retained/passing), and we will set custom sieving and QC limits accordingly.
Q5. Do you offer FSC® certified material?
We can supply lines with FSC® chain‑of‑custody upon request for eligible SKUs. Please specify at RFQ so we allocate the correct stock.
Q6. Is there a food‑contact option?
Certain product lines can be prepared for food-contact adjacent uses. Share your regulatory framework so we can assess and specify the correct grade.
Q7. How do I minimize dust in my process?
Choose medium or coarse fractions where appropriate, consider anti‑dust handling, and maintain sealed storage to control moisture swings.
Q8. What packaging should I choose—25 kg sacks or big bags?
Select 25 kg sacks for flexible dosing and trials; choose big bags for stable, high‑volume processes with fixed dosing systems.
Q9. Do you supply decorative cork granules and custom packaging and labeling?
Yes. We offer decorative cork granules, custom packaging and labeling, and private label programs to align with your brand and distribution model.
References
- FAO (Food and Agriculture Organization) — Background on cork oak (Quercus suber) and Mediterranean forestry.
- FSC® (Forest Stewardship Council) — Chain of Custody FSC-STD-40-004 and responsible sourcing frameworks.
- EU REACH — Regulation (EC) No 1907/2006; chemical safety and substance controls.
- EU RoHS — Directive 2011/65/EU (and amendments) on restriction of hazardous substances.
- ISO 9001 — Quality management systems and process control requirements.
- ISO 8302 / ASTM C177 — Steady-state thermal conductivity test methods (guarded hot plate).
- ISO 354 — Measurement of sound absorption in a reverberation room.
- ISO 3310 series — Test sieves for particle size analysis.
These references are provided for context; your procurement specifications should cite the exact document versions and test conditions applicable to your region and product.
Call to Action
Build a premium, compliant line with a manufacturer that understands both sustainability and scale. Contact EcoCorker for samples, RFQs, and private‑label proposals.
Web: www.EcoCorker.com • Email: info@EcoCorker.com • Location: Xi’an, China
As your custom cork roller manufacturer, we’ll align materials, branding, compliance, and logistics so your launches are smooth—and repeat orders even smoother.
