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DIRECT FACTORY ENGINEERED PAPER SOLUTIONS

High-Performance Electrolytic Capacitor Paper Solutions — Engineered for Next-Gen Aluminum Electrolytic Capacitors

From ultra-low ESR SMD devices to 1,795V GaN high-voltage inverters, Heming Paper delivers 28+ model series of electrolytic capacitor paper. Backed by Xianhe Corp.'s 59 production lines and cleanroom manufacturing capabilities, we provide certified OEM slitting, full NKK cross-reference equivalence, and wholesale supply across over 30 countries.

15 μm – 70 μm

Thickness Gauge Range

0.35 – 1.00 g/cm³

Custom Density / Tightness

Up to 1,795 V

Highest Breakdown Voltage

100% NKK Equivalent

Direct Drop-in Replacement

1 Metric Ton

Low Factory MOQ

What Is Electrolytic Capacitor Paper and Why Is It Known as the "King of Paper"?

Electrolytic capacitor paper (also known as electrolytic paper or capacitor separator paper) is an ultra-pure, engineered cellulose separator placed between the anode and cathode aluminium foils inside aluminium electrolytic capacitors. It acts as an electrical insulator to prevent short circuits while absorbing and retaining the liquid electrolyte. Known as the "King of Paper" for its stringent manufacturing standards, it requires strict density uniformity, deionized water processing, zero carbon contamination, and chloride levels below 2.0 mg/kg.

As a premier electrolytic capacitor paper manufacturer, Heming Paper (a subsidiary of publicly listed Xianhe Corp., SSE: 603733) operates 59 modern speciality papermaking lines. With 4 new dedicated lines deployed in 2024, we fulfill global B2B procurement demands by delivering superior dimensional stability, low impedance, high tensile strength, and stringent chemical purity.

Targeted Engineering Solutions by Application

Every aluminum electrolytic capacitor design requires a tailored balance between Equivalent Series Resistance (ESR), breakdown voltage (BDV), compactness, and thermal endurance. Discover our specialized electrolytic paper solution series:

Ultra-High Voltage & GaN Power

Renewable Energy Inverters & Fast Charging

Recommended Series: XWF75–100, WHKD75, TDS75-40

KBreakdown Voltage: 1,000V – 1,795V (Composite off-machine layers)

Key Advantage: Eliminates dielectric breakdown under high ripple current; replaces NKK EDH/EDHM/EDSH grades.

Automotive & SMD Grade

Automotive Electronics & Automated SMD

Recommended Series: XHF40-40, MJT2 Series (35-40 to 50-40)

Density / Gauge: 0.35–0.50 g/cm³ | 40–50 μm

Key Advantage: Formulated with non-polar fibres for ultra-low loss, exceptional thermal stability, and low mass loss.

Wide-Temperature Domain

5G Base Stations & Outdoor Power Supplies

Recommended Series: MTX Series (MTX60-40, MTX60-60, MTX65-30)

Operating Range: Reliable down to -55°C without crystallization

Key Advantage: High chemical purity; rapid electrolyte absorption prevents low-temperature dry-up.

Solid Electrolytic (Carbon-Free)

Solid Aluminum Capacitors (Skip-Carbonization)

Recommended Series: XH, XHT (35-40 to 50-50), XHG (60-60, 65-60)

Voltage Coverage: ≤10V (XHT35) up to 200V (XHG65)

Key Advantage: Zero carbonization equipment required; reduces production energy, boosts product yields, and lowers total manufacturing costs.

Ultra-Low ESR & High Frequency

Switch-Mode Power Supplies (SMPS) & Motherboards

Recommended Series: MJ2 Series (0.35–0.50 g/cm³), SM2, WCD2

ESR Performance: As low as 0.36 Ω/kHz (23°C EG electrolyte)

Key Advantage: A highly porous fiber matrix enables maximum liquid electrolyte uptake and minimal internal heat.

Cost-Effective & High Reliability

Consumer Electronics, Lighting & Industrial PSUs

Recommended Series: W1 (15–50μm), W2, WS2, EX Series

EX Upgrade: Provides a +150V to +200V higher breakdown voltage than standard W1, with no additional high cost.

Economic Variants: WJ255, SD2, SDT2 for optimized BOM budget.

Engineering Selection Guide: How to Select the Optimal Electrolytic Paper

Selecting the right electrolytic capacitor paper directly dictates capacitor lifespan, impedance curve, short-circuit defect rate, and dimensional footprint. Use our four-pillar engineering rulebook:

1. To Lower Impedance (ESR)

Select paper utilizing low-impedance fiber raw materials (S, M, D, J fiber blends). Specify low tightness/density (0.35–0.55 g/cm³) and thinner gauges (e.g., MJ2, S2, SM2, WJ2).

2. To Minimize Short-Circuit Rate

Opt for higher-tightness paper (≥0.80 g/cm³ such as W180, W190, WS280, KS280), thicker gauges (WM2 60–80μm), or specify double-layer / dual-ply paper architectures.

3. To Reduce Component Volume

Choose ultra-thin capacitor separator papers to maximize active foil area inside miniature cans: W100-15 (15μm), W180-20 (20μm), S270-30 (30μm), or XWF100-30.

4. To Withstand High Voltage (>1000V)

Choose multi-layer machine-composite or off-machine laminated structures (XWF75~100, WHKD75) to achieve breakdown voltage ratings between 1,000V and 1,795V.

Heming / Xianhe Naming Nomenclature Demystified

Our model code specifies exact material composition, ply count, density, and thickness:

[Raw Material] + [Layers: 1/2] + [Tightness: 2 Digits] - [Thickness (μm)]

Example: WM 2 70-50 = Double-layer composite (2) made of Wood & Manila Hemp fibers (WM), with 0.70 g/cm³ tightness (70) and 50 μm thickness (-50).

Nippon Kodoshi (NKK) & Global Cross-Reference Equivalent Table

Transition seamlessly from imported Japanese grades to Heming factory-direct electrolytic capacitor paper rolls with zero re-engineering risks. We offer direct functional equivalents with shorter lead times and substantial cost savings:

Heming / Xianhe Model	Global / NKK Equivalent Model	Tightness (g/cm³)	Thickness (μm)	Target Application / Replacement Focus
W165-40 / 50	NKK PE3-40 / 50	0.65	40, 50	Standard radial consumer electrolytic capacitors
W180-20 / 25 / 30 / 40	NKK PE4-20 / 25 / 30 / 40	0.80	20, 25, 30, 40	Miniature capacitors, LED drivers, power adapters
W190-20 / 25 / 30 / 40	NKK PE5-20 / 25 / 30 / 40, LEDM-40	0.90	20, 25, 30, 40	High-density anti-short circuit applications
EX75 / EX80 / EX85 / EX90	NKK PE4 / PE5 Enhanced BDV	0.75–0.90	20–30	Higher safety margin (+150V~200V BDV over W1)
MJ235-40 / 50	NKK MR5D0.5-40 / 50, RTZ33-40 / 50	0.35	40, 50	Ultra-low ESR, high-frequency filtering
MJ240 / MJ245	NKK MR5D1 / MR5D1.5 / MER1.5	0.40–0.45	40, 50	Low impedance, high ripple current handling
MJT235 ~ MJT250	Daifuku MEG-40, MEX1-40, MEX1.5-40/50	0.35–0.50	40, 50	Surface Mount Device (SMD) aluminum capacitors
SM250 / SM255 / SM260	NKK MR5D2 / MR5D2.5 / MER2 / WE2.5	0.50–0.60	40, 50, 60	Industrial SMPS, balanced ESR and tensile strength
S270-30 / 40 / 50 / 60	NKK WEDH-30 / 40 / 50 / 60	0.70	30, 40, 50, 60	High-reliability long-life industrial power capacitors
WCD258 / WCD265	NKK PXWD61 / PXWD65 / PXW7D54	0.58–0.65	40, 50, 60	Low-loss, high-fluidity electrolyte systems
XMF65-40 / 50	NKK EDL-40 / 50	0.65	40, 50	Machine-composite (High Voltage + Low Loss)
XWF75 / 80 / 85 / 90 / 100	NKK EDH, EDHML, EDHM, EDSH	0.75–1.00	30, 40, 50, 60	Ultra-high breakdown voltage (1000V–1795V) for GaN & EV
TDS75-40	NKK PXWDH76-40	0.75	40	Low loss with 700V BDV breakdown rating

Chemical Purity & Quality Verification Standards

Capacitor longevity and leakage current performance hinge on atomic-level chemical cleanliness. Every batch of Heming electrolytic paper undergoes strict 4-stage inspection adhering to national and international standards:

Inspection Parameter	Standard Specification	Test Method & Protocol	Impact on Capacitor Reliability
Water-Soluble Chlorides (Cl⁻)	< 2.0 mg/kg (ppm)	Ion Chromatography	Prevents anode aluminum foil pitting corrosion and leakage current spikes.
Water Extract Conductivity	≤ 1.1 mS/m	GB/T 7977-2007	Ensures zero ionic contamination in working electrolyte.
pH Value	6.0 – 8.0	GB/T 1545-2008	Maintains chemical neutrality; preserves oxide dielectric layer.
Iron (Fe) Microparticles (0.08–0.1mm²)	≤ 5 pcs / 1,800 cm²	Prussian Blue Reaction (HNO₃ + K₄Fe(CN)₆)	Eliminates micro-short circuits across dielectric gaps.
Iron (Fe) Microparticles (>0.1mm²)	Strictly 0 (Not Allowed)	Prussian Blue Visual Area Analysis	100% defect-free guarantee against catastrophic breakdown.
Sulfate Ions (SO₄²⁻)	< 15 mg/kg	Ion Chromatography	Suppresses unwanted electrochemical side reactions.
Moisture Content	3.0% – 7.0%	GB/T 462	Guarantees optimal winding tension and drying efficiency.

Custom Slitting, Cleanroom Packaging & Handling Standards

Precision slitting machine processing narrow-width electrolytic capacitor paper rolls in cleanroom workshop.

Precision Slitting & Dimensions

Standard Web Widths: 500 mm, 580 mm (tolerance ≤ ±2 mm).

Custom Slitting Widths: Slit to any required spool width with tight ±1 mm tolerance.

Roll Outer Diameter: 260 mm – 320 mm (standard < 290 mm).

Core Dimensions: High-rigidity paper core with 96.2 mm outer diameter.

Roll Splicing: Maximum 2 joints per roll, firmly bonded with clear markings.

Cleanroom Packaging & Storage Protocol

Triple Barrier Packaging: Polyethylene inner bag + corrugated export carton + reinforced plastic strapping.

Handling Requirement: Must be processed in cleanrooms (RH ≤ 70%) using deionized-water sterilized cotton gloves.

Stacking & Storage: Store in ventilated, clean warehouses away from ground dampness; stacking limit ≤ 4 layers.

Guaranteed Shelf Life: 3-Year Quality Warranty from date of production.

Environmental: 100% non-toxic, unbleached pure cellulose, naturally biodegradable.

Automated robotic arm packing and palletizing boxed electrolytic capacitor paper rolls in dust-free cleanroom.

Why Source from Heming Paper — Scale, Innovation & Reliability

Publicly Listed Parentage (SSE: 603733)

Backed by Xianhe Corp., China's specialty paper giant with 5 manufacturing bases, 59 papermaking lines, and annual group output exceeding 2,000,000 tons. Guaranteed long-term raw material security.

Dedicated 2024 Capacity Expansion

Deployed 4 next-generation capacitor paper lines at the Changshan Zefeng manufacturing base in late 2024, specifically addressing global shortages in renewable energy, EV, and 5G sectors.

Proven R&D & Engineering Bench

169 R&D specialists, 80+ senior capacitor paper engineers, in-house Post-Doctoral Workstation, and Academician Research Center with annual R&D investment exceeding 3.6% of revenue.

Full International Certifications

Certified to ISO 9001 (Quality), ISO 14001 (Environmental), ISO 45001 (Occupational Health), FSC Chain-of-Custody, and National QS Production Licensing.

Frequently Asked Questions (FAQ)

Clear technical and commercial answers for procurement managers and production engineers.

What is the Minimum Order Quantity (MOQ) and sample policy for electrolytic capacitor paper?

Our standard factory MOQ is 1 metric ton for regular specifications. We provide free A4 sheet test samples or short trial rolls shipped via express air freight within 3–5 business days for compatibility and dielectric evaluation.

How does your electrolytic paper compare with Japanese NKK (Nippon Kodoshi) products?

Can you develop custom formulations for specialized ESR or high-voltage requirements?

What export terms and logistics do you support?

Exterior view of the headquarters and manufacturing base of Heming Paper, a leading electrolytic capacitor paper manufacturer.

Factory Base: Changshan Zefeng Base, Quzhou, Zhejiang, China

Request Factory-Direct Quotation & Technical Datasheet

Connect directly with our senior capacitor paper engineering team. Share your required specifications or current NKK model code, and receive a competitive wholesale quotation and complete physical/chemical test report within 12 hours.