Acid-free paper, also known as sulfur-free paper or neutral paper, is a specialized material designed to protect products from oxidation, corrosion, and environmental degradation. Unlike ordinary paper that may contain acids, sulfur, or other reactive elements, acid-free paper is processed with alkaline buffers and neutral pH levels to ensure long-term preservation and stability.

At Guangdong Xinyuanshun New Materials Co., Ltd., we manufacture high-quality acid-free and sulfur-free paper products that provide superior anti-oxidation and isolation protection for sensitive materials such as metals, electronics, and optical components. Our products are made primarily from Kraft Paper and are widely used in industries where long-term material protection is essential.

1. What Is Acid-Free Paper?

Acid-free paper refers to paper made without harmful acidic chemicals. Standard paper often contains lignin and sulfur, which can release acids over time, causing yellowing, brittleness, and oxidation. In contrast, acid-free paper maintains a pH value of 7 or higher, making it chemically stable and ideal for applications requiring clean, non-reactive packaging.

Key Characteristics

Production Process Overview

1. Raw Material Selection – Using high-grade pulp with low sulfur and metal content.

2. Chemical Neutralization – Removing acidic substances through alkaline treatment.

3. Refining and Forming – Producing smooth, durable sheets with uniform fiber density.

4. Surface Processing – Enhancing barrier properties against humidity and oxidation.

5. Slitting & Packaging – Custom cutting per customer specifications and paper roll packaging for protection.

Our sulfur-free and dust-free paper products maintain exceptional cleanliness and strength, ensuring that even fragile or high-value materials remain in pristine condition during storage or transportation.

2. The Purpose and Function of Acid-Free Paper

The main purpose of acid-free paper is to isolate and protect sensitive materials from external environmental effects such as oxygen, moisture, and chemical reactions. It acts as a barrier layer that preserves quality, shine, and stability.

A) Anti-Oxidation Protection

Metals such as gold, silver, aluminum, and copper are prone to oxidation, which causes discoloration and tarnishing. Acid-free paper prevents this by:

• Blocking sulfur compounds that catalyze oxidation.

• Absorbing minimal moisture to maintain a dry environment.

• Maintaining a neutral chemical balance, preventing corrosion or pitting on surfaces.

This is why acid-free paper is often used in jewelry packaging, silverware wrapping, and electronic components.

B) Isolation and Cushioning

In packaging applications, the paper acts as both a separator and protective layer:

• Prevents direct contact between metal parts or sensitive surfaces.

• Reduces scratches and mechanical friction.

• Serves as an inner lining for boxes or wrapping sheets in bulk packaging.

C) Environmental Benefits

Acid-free paper is sustainable and biodegradable, unlike plastic or chemically treated paper.

• Produced with minimal chemical residues.

• Suitable for eco-conscious industries.

• Easily recyclable without harmful waste discharge.

At Xinyuanshun, we prioritize environmentally friendly production and provide OEM/ODM customization to meet global sustainability goals.

D) Long-Term Stability

The biggest advantage of acid-free paper is its long lifespan:

• Retains color and texture for years without yellowing.

• Does not release corrosive gases.

• Remains stable under varying temperature and humidity conditions.

This makes it ideal not only for industrial applications but also for archival storage, artwork, and documentation.

3. Applications of Acid-Free (Sulfur-Free) Paper

Our sulfur-free paper serves as a protective and isolating material across multiple industries. Its ability to prevent oxidation makes it indispensable in both manufacturing and packaging.

A) Electronics and Optoelectronics

• Used for semiconductor wafers, optical lenses, and photovoltaic cells.

• Protects sensitive materials during processing and transport.

• Prevents contamination by dust or airborne sulfur compounds.

Example: During solar cell packaging, sulfur-free paper is layered between panels to avoid reaction with silver electrodes.

B) Metal and Jewelry Industry

• Essential for gold, silver, and copper preservation.

• Prevents discoloration, oxidation, and chemical tarnish.

• Often used in high-end packaging boxes and storage liners.

C) Industrial Manufacturing

• Acts as a protective separator in metal stacking and shipping.

• Used as an inner liner for metal stamping, die casting, and precision part production.

• Withstands mechanical stress while preventing micro-scratches.

D) Paper and Printing Industry

• Ideal for art paper and archival document protection.

• Prevents acid migration and fading over time.

• Used by museums, libraries, and luxury brands for premium paper products.

Summary

The purpose of acid-free paper is to protect valuable materials from oxidation, corrosion, and chemical reactions. Its neutral pH and sulfur-free composition make it essential for industries requiring high cleanliness and stability.

At Guangdong Xinyuanshun New Materials Co., Ltd., our sulfur-free and dust-free paper is crafted from premium kraft material, offering:

• Excellent anti-oxidation properties.

• High tear strength and mechanical durability.

• Customizable widths and thicknesses per client needs.

• Eco-friendly and sustainable performance.

Whether used for gold, silver, electronic components, or optical materials, our acid-free paper ensures that every product remains clean, corrosion-free, and well-preserved.

Guangdong Xinyuanshun — Your Reliable Partner for Advanced Sulfur-Free and Acid-Free Paper Solutions.