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Internal structure diagram of an aluminum electrolytic capacitor showing the paper layer

Packaging specifications and dimensions diagram for electrolytic capacitor paper rolls

Precision slitting machine cutting capacitor paper into narrow rolls

Industrial manufacturing machine processing electrolytic capacitor paper in a clean facility

High-density electrolytic capacitor paper roll on

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High-Compression Electrolytic Capacitor Paper

Q: What is the primary function of electrolytic capacitor paper?

Insulation: Serves as a reliable physical separator between the anode and cathode foils to prevent short circuits. Electrolyte Absorption: Features a highly porous fibrous structure to absorb and retain the liquid electrolyte, ensuring optimal electrical conductivity. Application: Specifically engineered for manufacturing aluminum electrolytic capacitors, including radial, axial, and SMD configurations.

Q: How to choose the right capacitor paper for low ESR (Equivalent Series Resistance) requirements?

Material Selection: Opt for low-impedance fiber materials, such as the S, M, D, or J series. Physical Specs: Select low-thickness models (e.g., 40µm) or low-tightness options (ranging from 0.35 to 0.55 g/cm³). Recommended Models: The MJT2 and SM2 series are explicitly engineered to minimize energy loss and reduce overall ESR in high-frequency applications.

Q: Which capacitor paper is compatible with SMD (Surface Mount Device) manufacturing?

Targeted Series: The MJT2 series is developed specifically for SMD electrolytic capacitors. Key Advantages: Delivers high chemical purity, supports compact component volume, and perfectly integrates with automated surface-mount assembly lines. Thermal Stability: Maintains structural integrity and prevents crystallization during high-temperature reflow soldering processes.

Q: How do you guarantee the chemical purity to prevent capacitor failure?

Chloride Control: Water-soluble chloride content is strictly limited to <2.0 mg/kg to prevent internal foil corrosion. Conductivity: Maintained at ≤ 1.1 mS/m to ensure stable electrical performance. Impurity Elimination: Zero tolerance for iron microparticles (>0.1 mm²) to eliminate the risk of high-voltage breakdown.

Q: Do you support custom slitting widths for capacitor paper rolls?

Standard Dimensions: Default roll widths are 500mm and 580mm, with standard roll diameters ranging from 260mm to 320mm. Custom Slitting: Full customization is supported based on your manufacturing equipment requirements, maintaining a strict width tolerance of ±1mm. Joint Control: Roll integrity is strictly managed, allowing a maximum of 2 firmly bonded and clearly marked joints per roll.

Q: What are the specific storage and handling requirements?

Storage Environment: Must be stored in dry, clean, and well-ventilated areas away from ground contact, with relative humidity (RH) ≤ 70%. Handling Protocol: Exposed products must be handled in dust-free environments using deionized water-disinfected cotton gloves to prevent contamination. Shelf Life: Maintains optimal physical and chemical stability for up to 3 years from the production date under specified conditions.

Application: Specifically engineered for aluminum electrolytic capacitors (including SMD and radial types).
Performance: Optimized for ultra-low Equivalent Series Resistance (ESR) and high breakdown voltage.
Physical Specs: Uniform fibrous structure with tight density control ($0.35$ to $1.00 g/cm^3$).
Dimensions: Available in thicknesses from $15\mu m$ to $70\mu m$. Roll widths of 500mm/580mm (Custom slitting supported).
Compliance: Carbon-free manufacturing process, high chemical purity, and strictly controlled water-soluble chlorides.

Availability:



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Model:
W1, W2, WS, WM, WB, SM, and S2
Brand:
Xianhe

Product Description

1. Company Overview

Xianhe Corp. specializes in the research, development, and manufacturing of high-performance specialty papers, pulp, and related chemical additives.

· Established: December 2001 (Listed on the Shanghai Stock Exchange in April 2018).

· Infrastructure: 5 manufacturing bases and 59 advanced papermaking lines across China.

· Workforce & Output: Over 7,400 employees with an annual production capacity exceeding 2 million tons.

· Certifications: ISO9001, ISO14001, OHSAS, FSC, and QS Production Licenses.

· Strategic Vision: To be a global leader in high-performance, paper-based functional materials.

2. Product Development & Engineering

Xianhe continuously invests in advanced production technology to manufacture premium electrolytic capacitor paper, widely recognized as a highly technically demanding specialty paper.

· Proven Track Record: Successfully developed the W1, W2, WS, WM, WB, SM, and S2 series, widely adopted by leading aluminum electrolytic capacitor manufacturers.

· Continuous Innovation: Launched advanced series including PD, XHG, MJT2, MT, MTX, W100, and XWF to meet evolving demands in 5G applications and wide-temperature environments (replacing imported alternatives).

· Capacity Expansion: Deployed four next-generation production lines in 2024 to support surging demand in the renewable energy and telecommunications sectors.

· Engineering Philosophy: Focused on achieving high compression resistance, minimal energy loss, and ultra-thin profiles.

Advanced production line for manufacturing high-compression capacitor paper

3. Physical Indicators (Technical Specifications)

Model	Tightness (g/cm³)	Thickness (µm)	MD Tensile Strength (≥ KN/m)	Liquid Absorb CD (≥ mm/10min)	Liquid Absorb MD (≥ mm/10min)	ESR Ref 23°C EG (Ω/KHz)	Breakdown Voltage Ref (V)
W1	0.65±0.03	40±3.2	1.50	5	3	1.40	410
W1	0.65±0.03	50±4.0	1.80	7	4	1.50	450
W1	0.70±0.03	20±1.6	1.20	-	-	1.10	360
W1	0.70±0.03	25±2.0	1.48	-	-	1.25	420
W1	0.70±0.03	30±2.4	1.50	-	-	1.35	450
W1	0.75±0.03	20±1.6	1.50	-	-	1.38	430
W1	0.80±0.03	25±2.0	1.60	-	-	1.54	450
W1	0.80±0.03	30±2.4	1.80	-	-	1.92	490
W1	0.80±0.03	40±3.2	2.00	-	-	2.59	530
W1	0.85±0.03	20±1.6	1.50	-	-	1.50	440
W1	0.85±0.03	25±2.0	1.60	-	-	1.70	480
W1	0.85±0.03	30±2.4	1.96	-	-	2.12	530
W1	0.90±0.03	20±1.6	1.60	-	-	1.61	450
W1	0.90±0.03	25±2.0	1.75	-	-	1.90	500
W1	0.90±0.03	30±2.4	2.10	-	-	2.25	580
W1	0.90±0.03	40±3.2	2.50	-	-	2.50	620
W1	1.00±0.03	15±1.2	1.20	-	-	1.30	400
W1	1.00±0.03	40±3.2	1.60	4	-	1.45	420
W2	0.70±0.03	50±4.0	2.00	7	-	1.70	470
W2	0.70±0.03	60±4.8	2.20	9	-	2.33	510
W2	0.70±0.03	70±5.6	2.40	11	-	2.60	580
W2	0.80±0.03	30±2.4	1.80	2	-	1.88	550
W2	0.80±0.03	40±3.2	2.50	3	-	2.10	570
W2	0.80±0.03	50±4.0	2.50	6	-	2.70	610
W2	0.80±0.03	60±4.8	3.50	7	-	3.05	650
W2	0.85±0.03	30±2.4	2.00	2	-	2.00	550
W2	0.85±0.03	40±3.2	2.20	2	-	2.55	560
W2	0.85±0.03	50±4.0	2.50	3	-	3.00	620
W2	0.85±0.03	60±4.8	3.00	4	-	3.20	680
W2	0.85±0.03	70±5.6	3.80	6	-	3.40	750
W2	0.90±0.03	35±2.8	2.30	1	-	2.30	630
W2	0.90±0.03	40±3.2	2.60	2	-	2.40	650
WS2	0.80±0.03	40±3.2	2.00	3	-	2.30	580
WS2	0.80±0.03	50±4.0	2.50	4	-	2.30	650
WS2	0.80±0.03	60±4.8	3.00	5	-	2.80	750
WS2	0.80±0.03	70±5.6	3.50	7	-	3.10	820
WS2	0.85±0.03	40±3.2	2.50	5	-	2.10	600
WS2	0.85±0.03	50±4.0	2.60	7	-	2.50	680
WS2	0.85±0.03	60±4.8	3.00	8	-	3.00	780
WD2	0.65±0.03	40±3.2	1.80	10	-	1.30	500
WD2	0.65±0.03	50±4.0	2.20	12	-	1.50	560
WD2	0.70±0.03	40±3.2	2.00	6	-	1.40	500
WD2	0.70±0.03	50±4.0	2.20	7	-	1.70	570
WD2	0.70±0.03	60±4.8	2.60	8	-	2.05	630
WCD2	0.58±0.03	40±3.2	1.60	8	-	1.23	500
WCD2	0.58±0.03	50±4.0	1.90	15	-	1.35	560
WCD2	0.58±0.03	60±4.8	2.20	16	-	1.60	600
PD2	0.65±0.03	40±3.2	1.80	10	-	1.28	510
PD2	0.65±0.03	50±4.0	2.00	14	-	1.48	560
PD2	0.70±0.03	40±3.2	2.00	8	-	1.42	580
PD2	0.70±0.03	45±3.6	2.10	9	-	1.55	600
PD2	0.70±0.03	50±4.0	2.50	10	-	1.72	620
PD2	0.80±0.03	40±3.2	2.20	7	-	1.86	640
XW	0.85±0.03	30±2.4	1.90	2	-	2.40	620
XW	0.85±0.03	40±3.2	2.20	2	-	2.55	650
XW	0.85±0.03	45±3.6	2.50	2	-	2.88	670
XW	0.85±0.03	50±4.0	3.00	2	-	3.06	700
XW	0.85±0.03	60±4.8	3.50	3	-	3.30	770
KS2	0.75±0.03	30±2.4	1.80	3	-	1.39	530
KS2	0.80±0.03	30±2.4	1.80	3	-	1.46	560
WM2	0.70±0.03	40±3.2	1.80	6	-	1.36	410
WM2	0.70±0.03	50±4.0	2.00	8	-	1.68	470
WM2	0.70±0.03	60±4.8	2.40	10	-	1.90	520
WM2	0.70±0.03	70±5.6	2.60	12	-	2.05	550
WJ2	0.55±0.03	40±3.2	1.30	12	6	1.18	390
WJ2	0.55±0.03	50±4.0	1.50	18	8	1.24	420
WB2	0.60±0.03	45±3.6	1.60	13	6	1.32	410
WB2	0.60±0.03	50±4.0	1.80	14	8	1.40	440
SM2	0.50±0.03	40±3.2	1.10	18	25	0.82	-
SM2	0.50±0.03	50±4.0	1.25	20	32	0.88	-
SM2	0.55±0.03	40±3.2	1.30	24	16	1.86	-
SM2	0.55±0.03	50±4.0	1.40	18	28	0.95	-
SM2	0.60±0.03	40±3.2	1.34	10	15	0.96	-
SM2	0.60±0.03	50±4.0	1.40	28	14	1.15	-
SM2	0.60±0.03	60±4.8	1.60	16	32	1.40	-
SD2	0.55±0.03	40±3.2	1.10	16	10	0.90	-
SD2	0.55±0.03	50±4.0	1.30	12	20	0.98	-
SD2	0.60±0.03	40±3.2	1.34	15	10	1.08	-
SD2	0.60±0.03	50±4.0	1.40	24	12	1.20	-
SD2	0.60±0.03	60±4.8	1.60	14	25	1.45	-
SDT2	0.65±0.03	40±3.2	1.40	18	12	1.20	400
SDT2	0.65±0.03	50±4.0	1.60	14	22	1.38	400
SMD2	0.55±0.03	40±3.2	1.00	12	20	0.94	-
SMD2	0.55±0.03	50±4.0	1.20	18	25	1.00	-
SMD2	0.55±0.03	40±3.7	1.00	17	20	0.92	-
SMD2	0.55±0.03	50±4.0	1.20	18	24	1.05	-
SMD2	0.60±0.03	40±3.2	1.10	15	10	1.12	-
SMD2	0.60±0.03	50±4.0	1.20	16	21	1.32	-
SMD2	0.65±0.03	50±4.0	1.30	18	22	1.40	440
S2	0.70±0.03	30±2.4	1.50	5	-	1.10	470
S2	0.70±0.03	40±3.2	1.80	6	-	1.25	500
S2	0.70±0.03	50±4.0	2.00	8	-	1.33	560
S2	0.70±0.03	60±4.8	2.50	10	-	1.43	600
MJ2	0.35±0.03	40±3.2	0.50	48	20	0.36	-
MJ2	0.40±0.03	40±3.2	0.70	35	20	0.42	-
MJ2	0.40±0.03	50±4.0	0.80	45	22	0.55	-
MJ2	0.45±0.03	40±3.2	0.80	30	16	0.48	-
MJ2	0.45±0.03	50±4.0	1.00	40	20	0.58	-
MJ2	0.50±0.03	40±3.2	1.30	18	30	0.53	-
MJ2	0.50±0.03	50±4.0	1.60	20	40	0.61	-
XH	0.45±0.03	45±3.6	0.60	50	30	1.45	-
XH	0.50±0.03	40±3.2	0.60	25	15	1.50	-
XH	0.50±0.03	45±3.6	0.70	13	25	1.55	-
XHT	0.35±0.03	40±3.2	0.40	10	12	1.40	-
XHT	0.40±0.03	40±3.2	0.45	20	15	1.45	-
XHT	0.50±0.03	45±3.6	0.80	40	20	1.48	-
XHT	0.50±0.03	50±3.6	0.80	18	30	1.55	-
XHT	0.50±0.03	60±4.8	0.10	18	28	0.62	-
XHG	0.60±0.03	65±4.8	1.30	20	35	1.65	-
XHG	0.65±0.03	60±4.8	1.10	25	14	1.70	-
MJT2	0.35±0.03	40±3.2	0.50	20	40	1.40	-
MJT2	0.40±0.03	40±3.7	0.70	30	20	0.42	-
MJT2	0.40±0.03	45±3.6	0.75	20	30	1.46	-
MJT2	0.45±0.03	40±3.2	0.80	19	30	1.47	-
MJT2	0.45±0.03	50±4.0	0.85	18	32	1.58	-
MJT2	0.50±0.03	40±3.2	1.10	15	20	1.52	-
MJTX	0.50±0.03	40±3.2	1.20	10	30	1.55	450
MJTX	0.60±0.03	60±4.8	1.50	18	30	0.70	500
MJTX	0.65±0.03	30±2.4	0.80	15	10	1.52	420

4. Chemical Indicators

Parameter	Unit	Standard	Test Method
Water-soluble chloride content	mg/kg	<2.0	Ion chromatography
Conductivity	mS/m	≤ 1.1	GB/T7977-2007
pH	-	6.0-8.0	GB/T1545-2008
Iron microparticles (0.08-0.1 mm²)	pcs/1800cm²	≤ 5	See Test Method 9
Iron microparticles (>0.1 mm²)	pcs/1800cm²	Not allowed	See Test Method 9
Moisture	%	3.0-7.0	GB/T462
Sulfate ion	mg/kg	<15	Ion chromatography

5. Appearance Indicators

1. 1. Uniformity: The fibrous structure must be uniform, without hard blocks, creases, holes, yellow streaks, wrinkles, or coarse fiber bundles. The surface should be flat without obvious poor formation or light transmission. Harmful impurities and dust are strictly prohibited.

2. 2. Roll Integrity: The end face of the paper roll must be neat without mechanical damage. Tightness at both ends should be consistent, and edges free of cracks. Maximum 2 joints per roll, firmly bonded with clear markings.

3. 3. Dimensions: Roll diameter ranges from 260mm to 320mm. Standard web widths are 500mm and 580mm (width deviation ≤ ±2mm) unless specified otherwise. Custom specifications follow customer standards or default to ±1mm tolerance.

Precision cutting and winding process of custom electrolytic capacitor paper rolls

6. Test Methods

1. Sampling & Preparation: Conducted according to GB/T450 and GB/T10739.

2. Thickness & Tightness: Conducted according to GB/T451. Thickness is measured by folding one sample outwards into 10 layers and measuring in sections along the transverse direction (distance ≤ 100mm, arithmetic mean taken).

3. Tensile Strength: Conducted according to GB/T12914. Arbitration follows GB/T129124.

4. Liquid Absorption Height: Conducted according to GB/T461.1.

5. Conductivity (Water Extract): Conducted according to GB/T7977; arbitration follows GB/T7976-2007.

6. pH (Water Extract): Conducted according to GB/T1545.2.

7. Water-Soluble Chlorides: Conducted according to GB/T2678.2 or determined via ion chromatography.

8. Delivery Moisture: Conducted according to GB/T462.

9. Iron Microparticles Determination: Use 10% HNO3 to generate Fe(NO3)3, then react with 5% K4Fe(CN)6·3H2O to form Prussian blue particles. Average counts from four 300x600mm sheets are evaluated.

9. Determination of Iron Microparticles:

Apparatus

1800 cm2 flat glass, non-metallic sprayer

Test Principle

Treat the sample with HNO3. If iron microparticles are present, they will react to form Fe(NO3)3, and then react with K4Fe(CN)6.3H2O to form [KFe(CN)6Fe]x, which appears Prussian blue, indicating the presence of iron microparticles.

Sampling

Proceed according to GB/T450. Take 4 sheets of paper measuring 300mm×600mm or equivalent area as air-dried samples. The sampling and testing processes should prevent dust and metal contamination.

Reagent Preparation

10% HNO3 solution: Weigh 84g of HNO3 with a specific gravity of 1.38 (content 60-63%), add water to 500ml, plus 5 drops of 5% KMnO4 solution, and shake well. 5% K4Fe(CN)6.3H2O solution: Weigh 25g of K4Fe(CN)6.3H2O and dissolve in 500ml of water.

10. Appearance Quality: Assessed via visual inspection.

11. ESR Value (23°C): Measured using the electrode method based on EG system electrolyte.

12. Breakdown Voltage: Implemented according to GB/3333-1999.

7. Selection Guidelines

Select appropriate electrolytic capacitor paper based on technical requirements and design goals:

· To Reduce Impedance: Utilize low-impedance fiber materials (S, M, D, J), low-thickness models (S2, SM2 40µm), or low-tightness options (S2, SM, MJ, WJ).

· To Minimize Short-Circuit Rates: Opt for high-tightness paper (W180, W185, W190, WS280, W285, WD270, KS280), high-thickness paper (WM2 60/70/80µm), or employ double-layer/dual-thin sheets instead of a single thick sheet.

· To Reduce Component Volume: Specify ultra-thin electrolytic paper (W180-20, W185-20, W190-20, S270-30, W100-15, W175-20, XWF100-30).

8. Appendix: Naming Convention

Format: [Fiber Code] + [Layers] + [Tightness] - [Thickness]

· Prefix Letters: Indicate the raw material (e.g., WM).

· First Digit: Indicates composite layers (1 = Single-layer; 2 = Double-layer).

· Next Digits: Indicate tightness (e.g., 50 means 0.50 g/cm³, 70 means 0.70 g/cm³).

· Suffix (after hyphen): Indicates thickness in µm.

Example: WM 2 70-50 = Double-layer composite paper made of W & M fibers, 0.70 g/cm³ tightness, 50µm thickness.

9. Packaging, Storage, and Handling

· Marking & Packaging: Complies with GB/T10342 or specific contract provisions.

· Handling: Use covered, clean transportation. Avoid rain, moisture, vibration, and mixing with corrosive materials. Handle with care to prevent puncturing; throwing is strictly prohibited.

· Product Usage: Exposed products must be handled in dust-free environments (RH ≤ 70%) wearing deionized water-disinfected cotton gloves. Reseal unused portions immediately.

· Storage: Store in dry (RH ≤ 70%), clean, and well-ventilated areas away from ground contact. Maximum stacking limit is 4 layers.

· Shelf Life: 3 years from the production date under optimal storage conditions.

· Disposal: Non-toxic, naturally degradable, and can be discarded as standard paper waste.

10. Advanced Product Lines

· WD265 Series: Optimizes the WD270 model by reducing paper density and Equivalent Series Resistance (ESR) while maintaining high compression strength.

· EX Series: Engineered for superior compression resistance, outperforming the standard W1 series by 150-200V.

· XH Series (Solid-State, Carbon-Free): Developed with international experts using ultra-low loss materials. Features superior liquid absorption, high stability, and eliminates the need for carbonization equipment, significantly reducing production costs.

· MJT2 Series (SMD Compatible): Designed specifically for Surface Mount Device (SMD) electrolytic capacitors. Features compact volume, high chemical purity, and automated assembly compatibility.

· MTX Series (Wide-Temperature): Tailored for 5G outdoor adapters. Operates reliably in ultra-low temperatures without crystallizing at -55°C.

11. R&D Pipeline

· XHF Series: Solid-state SMD capacitors utilizing a carbon-free process. High temperature resistance and low mass loss, ideal for automotive applications.

· TDS Series: Leverages extremely low-loss materials to deliver both high breakdown voltage and exceptional efficiency.

· WHKD75 Series: Machine composite design featuring a high-voltage fourdrinier layer (WH material) for pressure resistance and a modified ultra-low loss cylinder layer. High density (1.0g/cm³) yields optimized form factors.

· Off-Machine Composite Series (XMF/XWF): Designed to maximize breakdown voltage and minimize ESR via high-pressure dual-layer compositions, aiming to substitute premium imported materials.

12. Xianhe vs. Foreign Models Cross-Reference

Xianhe Model	Equivalent Foreign Model
W165-40, 50	PE3-40, 50
W180-20, 25, 30, 40	PE4-20, 25, 30, 40
W190-20, 25, 30, 40	PE5-20, 25, 30, 40, LEDM-40
WD270-40, 50, 60; WCD258-40, 50	PEDH-40, 50, 60, LD78-40, 50, 60; DXWD65-40, 50
W285-40, 50, 60	LD83-40, 50, 60
W290-40, 50	LD-40, 50
WD270-40, 50, 60, 70; PD270-40	LEDM-40, 50, 60, 70; PED-40, 50, 60, 70
WS280-40, 50, 60, 70	LD78-40, 50, 60, 70
MJ235-40, 50	MR5D0.5-40, 50RTZ33-40, 50
MJ240-40, 50	MR5D1-40, 50 MR5T40-40-50; MR5D4W40-40, 50
MJ245-40, 50	MR5D1.5-40, 50 MER1.5-40, 50; MR5D4W45-40
SM250-40, 50	MR5D2-40, 50 MER2-40, 50
SM255-40, 50; SD255-40, 50	MR5D2.5-40, 50 MER2.5-40, 50; WE2.5-40, 50
SM260-40, 50; SD260-40, 50	MER3-40, 50 WE3-40, 50
S270-30, 40, 50, 60	WEDH-30, 40, 50, 60
WCD258-40, 50, 60	PXWD61-40, 50 PXW7D54-60
WCD265-40, 50, 60	PXWD65-40 PXWD61-50 PXWD58-60
XMF65-40/50	EDL-40/50
XMF70-50	NX70-50
TDS75-40	PXWDH76-40
XWF80-40/50	EDHML-40/50
MJT235-40	MEG-40
MJT240-40	MEX1-40
MJT245-40	MEX1.5-40
MJT245-50	MEX1.5-50
MJT250-40	MEX2.0-40

FAQ

What is the primary function of electrolytic capacitor paper?

Insulation: Serves as a reliable physical separator between the anode and cathode foils to prevent short circuits.

Electrolyte Absorption: Features a highly porous fibrous structure to absorb and retain the liquid electrolyte, ensuring optimal electrical conductivity.

Application: Specifically engineered for manufacturing aluminum electrolytic capacitors, including radial, axial, and SMD configurations.

How to choose the right capacitor paper for low ESR (Equivalent Series Resistance) requirements?