Sulfur-Free Liner Paper is a high-purity, functional release material specifically developed for the high-end precision electronics manufacturing sector. Refined from high-purity virgin wood pulp using a specialized sulfur-free process (with a sulfur content of ≤50 mg/kg), the product eliminates the introduction of harmful substances-such as active sulfur and halogens-at the source. Serving as a critical protective consumable in electronic manufacturing processes, it provides superior interlayer separation and anti-corrosion protection for precision components and highly oxidizable solder joints (such as those made of silver or copper), making it an ideal choice for ensuring the yield and long-term stability of high-reliability electronic products.
Core Standards for Tiered Sulfur Content
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Parameter category |
Specific indicators |
Technical Specification Requirements |
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Acidity/Alkalinity (pH value) |
Extract pH |
7.0 ~ 8.5 (Neutral to slightly alkaline) Ensures freedom from acidic corrosion; causes no acidic erosion upon prolonged contact with metal surfaces. |
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Control of Hazardous Substances |
Fluorescent whitening agent |
None (to avoid migration risks) |
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Formaldehyde content |
None (meets health and safety standards) |
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Heavy metals (Pb, Cd, Hg, etc.) |
None (pure substrate) |
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Surface cleanliness |
Dust/lint rate |
Low-dust, lint-free, and non-shedding Suitable for high-cleanliness workshops; prevents contamination of PCB pads or electronic contacts |
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Weatherability and Thermal Stability |
Temperature tolerance range |
Weatherability and Thermal Stability |
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High-temperature aging characteristics |
Does not yellow or release sulfur gases at high temperatures. Prevents contamination of surrounding products by sulfide emissions during high-temperature storage or transport. |
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International Environmental Compliance |
EU regulations |
RoHS (Restriction of Hazardous Substances) compliant REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) compliant |
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Food-contact grade |
Can pass FDA (U.S. Food and Drug Administration) certification review for food-contact materials. |
Core Advantages
Anti-oxidation and anti-corrosion (S ≤ 50 ppm)
Eliminates sulfur sources; prevents silver-plated or immersion-silver PCBs from blackening or discoloring during long-term storage.
01
Neutral, stable, and durable
pH 7.0–8.5; acid-free and sulfur-free; remains durable without becoming brittle over decades of storage.
02
High cleanliness and low dust generation
Manufactured in cleanrooms; lint-free and dust-free; suitable for precision electronics and optical lenses.
03
High toughness and automation-compatible
Tensile strength ≥ 45 N/15 mm; fold endurance ≥ 500 cycles; ensures uninterrupted operation on high-speed production lines.
04
Eco-friendly and biodegradable
Made from pure plant fibers; RoHS, REACH, and FDA compliant; facilitates green export clearance.
05
Common specifications and parameters table
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Specification dimensions |
Classification |
Weight/Specifications |
|
Grammage (or weight per unit area) |
Ultra-thin model |
30g,35g |
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Universal model (mainstream) |
40g,60g,70g,80g |
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Thickened version |
100g or more |
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Size and Shape |
Flat sheet |
Standard sizes: 787 × 1092 mm and 898 × 1194 mm; custom sizes available. |
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reel |
Width customized to requirements |
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Striping |
Narrow tape (width on demand) |
Application Areas
Electronics & PCB Industry (Core Application): Suitable for immersion silver/gold-plated PCBs, FPCs, LED lead frames, and chips. Used for process separation and finished product packaging to effectively prevent silver surfaces from oxidizing or yellowing.
Precision Plated Hardware: Provides intermediate separation and protective packaging for silver-, gold-, or nickel-plated terminals, jewelry, and optical metal components.
Cultural Relics, Archives, and Art: Serves as a protective interleaving material for ancient books, calligraphy, paintings, and collectibles, helping to delay material aging and discoloration.
Medical and Optical Fields: Provides dust-free separation and disposable clean-room protective liners for lenses and medical instruments.
Storage and Usage Precautions
1. Storage Environment: Store in a sealed container within a dry, well-ventilated warehouse at a temperature of 18–25°C; protect from direct sunlight, moisture, and acidic or alkaline gases.
2. Keep away from sources of ignition, oil/grease, and chemicals; do not store outdoors. Shelf life: 24 months.
3. When handling silver-plated or precision metal products, wear sulfur-free anti-static gloves; direct skin contact with the metal surfaces is prohibited.
4. Do not store together with ordinary sulfur-containing paper or newspapers to prevent cross-contamination.
FAQ
Q: What precautions should be taken when storing Sulfur-Free Liner Paper?
A: The paper must be kept in its original packaging or vacuum-sealed after slitting. It should be stored in a dry, well-ventilated environment away from direct light, with relative humidity controlled between 25% and 50% and temperatures not exceeding 30°C. Avoid storing it alongside sulfur-containing chemicals, and pay attention to stacking height to prevent paper deformation.
Q: Is eco-friendly sulfur-free paper biodegradable?
A: Eco-friendly sulfur-free paper made from virgin wood pulp or bamboo pulp-without plastic coating-is biodegradable under specific composting conditions. When purchasing, you may request relevant biodegradability certifications or SGS test reports from the supplier.
Q: Can Sulfur-Free Liner Paper be reused?
A: Yes. Due to its high strength and excellent fold endurance, it can be reused multiple times provided it remains uncontaminated and undamaged, effectively reducing overall usage costs.
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