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Sulfur-free protective paper has emerged as a game-changer in electronics manufacturing, particularly for printed circuit boards (PCBs) and LED components. Traditional protective materials often contain sulfur compounds, which react with copper and silver traces on PCBs, leading to corrosion and electrical failures. Sulfur-free paper eliminates this risk by using alternative chemical formulations, ensuring long-term reliability for sensitive electronics412.

Kraft paper is a durable, tan-colored paper made from wood fibers of coniferous trees. The process involves breaking wood into pulp, beating it to strengthen fiber bonds, adding sizing and dyes, and forming sheets on a papermaking machine. Named for its tan color and cowhide-like toughness, it's widely used in packaging,envelope paper, adhesive sealing paper, asphalt paper, cable protection paper, insulating paper, and more.

Kraft paper adopts sulphate method of pulping (Kraft Process), with coniferous wood pulp as the main raw material, the fibre length up to 2-3 mm, lignin retention is more, so the texture is tough and tear-resistant. Unbleached kraft paper has a natural brownish-yellow colour, i.e. ‘brown kraft paper’, while bleached kraft paper is ‘white kraft paper’, and both types of kraft paper have high strength.

Sulfuric acid paper, also known as tracing paper or translucent paper, is widely used in various fields, ranging from fine drawing and printing work to industrial applications and artistic creations. Its unique properties, such as high transparency, excellent moisture resistance, and durability, make it an irreplaceable material in many areas. For example, in the printing industry, it is often used to make printing plates because its transparency enables the precise transfer of patterns. In the fields of architecture and engineering, it serves as an ideal medium for creating blueprints, allowing for the accurate replication of complex designs. Artists also favor it for its smooth texture and the ability to produce unique visual effects in artworks. So, how is sulfuric acid paper produced?

Acid-free paper, simply put, is paper that does not contain active acids. This paper is firm, strong and nearly neutral. The amount and color of this paper varies depending on the application, and it is a firm, strong, nearly neutral paper. When immersed in water, it produces a neutral or alkaline pH (7 or slightly higher). It is also lignin and sulfur free, which gives it good durability and makes it ideal for long-term storage of important items.