Top 10 Sulfur-Free Paper and Manufacturers in the USA (2026)

Sulfur-free paper is one of the most specialized industrial paper grades sold in the United States. Used to protect silver, copper, brass, and silver-plated electronics from sulfide tarnish, this paper category sits at the intersection of paper manufacturing, surface chemistry, and electronics packaging. Buyers in PCB manufacturing, LED assembly, photovoltaic production, jewelry, and precious-metal storage all rely on it, and the supplier base is smaller and more technical than for general industrial papers.

This guide compiles the leading sulfur-free paper suppliers operating in the United States in 2026 — established US-based manufacturers and converters with verified production capability, plus international manufacturers with significant US distribution and service. The list focuses on companies that publish documented sulfur content specifications, hold relevant ISO certifications, and serve high-purity industrial markets.

How We Selected the Companies on This List

Inclusion criteria emphasized three factors. First, demonstrated capability to produce or convert pH-neutral, low-sulfur paper with documented test results. Second, an active US presence — manufacturing site, US distributor network, or US sales office that can serve American buyers directly. Third, a track record serving industries where sulfur tarnish is a real problem: electronics, precious metals, archival storage, and photovoltaic.

The Top 10 Sulfur-Free Paper Suppliers

1. Ahlstrom

Headquarters: Helsinki, Finland (US operations in multiple states)

Established: 1851

Ahlstrom is a global specialty paper manufacturer with a major US footprint. Their interleave paper division produces the Glass-Gard line of low-sulfur, pH-neutral papers engineered for stacking glass, photovoltaic cells, and sensitive metal sheets. Ahlstrom controls chemistry tightly during production and offers FSC, SFI, and PEFC chain-of-custody certification on most grades. The company is one of the most established names in chemically-controlled interleaving paper and supplies many of the largest glass and metals manufacturers in North America.

Key products: Glass-Gard interleave paper, sulfur-controlled metal interleave paper, archival-grade specialty papers

Industries served: Float glass manufacturers, photovoltaic module producers, stainless steel mills, copper and brass mills, archival storage

2. EMI Specialty Papers

Headquarters: Bristol, Connecticut

Established: 1996

EMI Specialty Papers is an ISO 9001-certified manufacturer and converter of pH-neutral, sulfur-free paper for metals, glass, and archival applications. Their Bristol facility produces a broad range of specialty papers including anti-tarnish, anti-corrosive, vapor-proof, alkali-resistant, and dielectric grades. EMI is widely recognized for their willingness to handle custom slitting, narrow-width production, custom basis weights, and small-run specialty conversions that larger mills will not accept. They are a frequent supply choice for jewelry packaging, electronics interleaving, and precious-metal storage applications.

Key products: Sulfur-free interleaving paper, anti-tarnish tissue, archival paper, dielectric paper, custom slit rolls

Industries served: Jewelry, precious metals, electronics, archival, museum and library storage

3. Flexlink, LLC

Headquarters: Mansfield, Ohio

Established: Long-established specialty paper manufacturer

Flexlink is one of the most technically focused glass and metal interleaving paper manufacturers in the United States. Their Flexsheen line of glass interleaving paper is produced to ultra-low sulfur, controlled pH, and low resin levels — and Flexlink is notably the only US glass interleaving supplier that operates an accelerated aging room for in-house comparative testing of interleaving performance under heat and humidity. Their Flexsheen Family covers anti-tarnish papers, anti-corrosive papers, acid-free papers, and engineered glass and plastic interleaving products.

Key products: Flexsheen glass interleaving paper, anti-tarnish paper, acid-free paper, anti-corrosive paper

Industries served: Designer glass, automotive glass, computer screens, furniture glass, precious metal manufacturing, electronics

4. Xamax Industries

Headquarters: Connecticut

Established: Long-standing US specialty paper converter

Xamax produces a wide range of interleave materials including their EK product line — virgin kraft papers that are pH-neutral and low in sulfur and chloride content, developed specifically for direct contact on copper. Their AT tissue is a tarnish-resistant interleaving paper used for protecting precious metals. Xamax serves customers needing both protection-grade interleaving and standard high-tensile kraft for industrial wrapping. They also offer Tuff Kraft, HC Grade kraft, EK/HS poly-coated kraft for moisture barrier protection, and 100 percent cotton fabric for oil-free metal handling.

Key products: EK low-sulfur paper, AT anti-tarnish tissue, Tuff Kraft, EK/HS poly-coated kraft, cotton interleave fabric

Industries served: Precious metals, copper and brass manufacturers, electronics packaging, plated parts

5. RP Andrews Paper Inc.

Headquarters: Brooklyn, New York

Established: 1939

RP Andrews is a long-established manufacturer and converter of acid-free and sulfur-free papers, including buffered papers, anti-tarnish papers, neutral pH papers, asphalt laminated papers, creped papers, dissolving papers, dry waxed papers, and grease-proof papers. They produce in custom sizes, sheets, rolls, circles with or without center holes, and custom die-cut shapes. RP Andrews is widely used by museum and archival institutions, jewelry packagers, and electronics interleavers who need small custom runs and tight chemistry control.

Key products: Anti-tarnish tissue, neutral pH paper, buffered paper, custom die-cut sulfur-free shapes

Industries served: Museums, archives, jewelry, electronics, precious metal packaging

6. Papertec, Inc.

Headquarters: Clifton, New Jersey

Established: 1981

Papertec is a custom manufacturer of recycled and virgin kraft papers serving automotive, aerospace, packaging, and military industries. While their core business is high-strength kraft, they produce sulfur-controlled grades for sensitive applications and operate as a finishing service company offering slitting, sheeting, and conversion. Papertec is well-known to military and aerospace buyers because of their ability to meet tight specifications and handle MIL-spec compliance documentation. Their facility provides converting flexibility that pure mill suppliers do not offer.

Key products: Sulfur-controlled kraft paper, anti-tarnish paper, custom-converted specialty papers

Industries served: Military, aerospace, automotive, packaging

7. Pacothane Technologies

Headquarters: Massachusetts

Established: Long-established US specialty paper supplier

Pacothane Technologies produces specialty release and interleave papers for the printed circuit board manufacturing industry, including sulfur-free protective papers for PCB transit and storage. Their products are designed for direct contact with sensitive copper-clad and silver-plated PCB surfaces during the manufacturing flow between lamination, drilling, plating, and final assembly. Pacothane is a recognized name in the North American electronics manufacturing supply chain.

Key products: Sulfur-free PCB interleaving, PCB release paper, specialty electronics-grade papers

Industries served: PCB manufacturing, electronic assembly, semiconductor packaging

8. Robert Wilson Paper Corp.

Headquarters: Northeastern United States

Established: 1918

One of the longest-operating independent paper manufacturers in the United States, Robert Wilson Paper Corp. produces a wide range of specialty industrial papers including absorbent, laminated, latex-impregnated, glassine, coated, treated, and kraft papers — many available in pH-neutral and low-sulfur grades. The company serves automotive, food, beverage, printing, cosmetic, packaging, medical, and marketing industries with custom die-cut paper alongside roll and sheet stock. Their longevity and breadth make them a stable choice for multi-grade specifications.

Key products: Sulfur-controlled kraft, glassine, treated specialty papers, custom die-cut shapes

Industries served: Automotive, food, beverage, printing, cosmetic, packaging, medical

9. Hemptique (Trade Marker International / Ecusta)

Headquarters: California

Established: 1997

Hemptique manufactures and distributes reusable, protective gray and brown paper, including acid-free backing paper and single and double-sided release papers. Their products are made in the USA and offered in roll formats. They serve the artisan, archival, and craft markets but also industrial buyers who need pH-neutral, low-sulfur papers for protection of sensitive products. Their straightforward catalog and consistent supply make them a reliable secondary source for buyers who need acid-free protection at smaller volumes.

Key products: Acid-free protective paper, reusable kraft, single and double-sided release paper

Industries served: Archival, craft, jewelry, light industrial protection

10. Associated Bag

Headquarters: Milwaukee, Wisconsin

Established: 1938

Associated Bag is a major US distributor of acid-free VCI anti-rust poly-coated and multipurpose papers including sulfur-free protective stock. They specialize in same-day shipping with most products made in the USA. While primarily a distributor rather than a primary manufacturer, Associated Bag is included on this list because they are one of the most accessible single-source US suppliers for buyers who need acid-free, sulfur-controlled protective papers in standard formats with fast availability. Their inventory depth makes them especially useful for buyers who need to fulfill urgent specifications.

Key products: Acid-free VCI poly-coated paper, sulfur-free protective stock, multipurpose papers

Industries served: General industrial packaging, electronics, hardware, automotive

Comparison Table at a Glance

How to Evaluate a Sulfur-Free Paper Supplier

Before placing a volume order with any of these suppliers, request the following:

• Independent test report showing total reducible sulfur (TRS) content below 5 ppm
• pH test result demonstrating neutral chemistry (6.5–7.5)
• RoHS compliance statement if your end product requires it
• ISO 9001 certification for quality system documentation
• Free sample roll large enough to run a real-condition tarnish test
• Stated dust content and chloride content limits
• Documented basis weight tolerance (typically ±3%)

US-Based vs International Suppliers

Many high-purity sulfur-free papers used in US electronics manufacturing are sourced from international specialty mills — Ahlstrom (Finland), Asian specialty mills, and several European producers — and converted or distributed by US partners. For most buyers, this distinction matters less than the documentation, chemistry, and consistency. A well-managed US converter handling imported base paper can deliver tighter specifications than a domestic mill that does not focus on this specialty.

That said, some buyers — particularly those serving defense, aerospace, and government contracts — require domestic sourcing throughout the supply chain. For these buyers, EMI Specialty Papers, Flexlink, RP Andrews, Papertec, and Pacothane are the most relevant US-based options on this list.

Frequently Asked Questions

What is the sulfur threshold for true sulfur-free paper?

Most reputable suppliers target total reducible sulfur (TRS) below 5 ppm, with premium grades targeting below 2 ppm. Standard kraft paper can carry hundreds of ppm of residual sulfides, so the difference between sulfur-free and standard kraft is dramatic at the chemistry level.

Do these suppliers offer custom widths?

All ten of these suppliers offer custom slitting and sheeting. Some operate dedicated narrow-slit lines for specialty conversions. Custom widths typically have a minimum order quantity that varies by supplier and by paper grade.

How long does sulfur-free paper protect a part?

Indefinitely, in sealed packaging. Because sulfur-free paper is a passive material — it works by not contributing sulfur to the package atmosphere — its protective performance does not deplete over time. As long as the paper itself remains uncontaminated, the protection holds for years.

Can I get sulfur-free paper as printed wrap with branding?

Yes, several suppliers on this list offer printed sulfur-free paper using inks formulated to maintain low-sulfur compliance. Always verify the ink chemistry separately — standard inks can contain sulfur compounds that defeat the purpose of the paper.

The Bottom Line

The US sulfur-free paper market is served by a mix of large specialty mill operators and focused custom converters. For PCB, LED, and electronics applications, EMI Specialty Papers, Flexlink, Pacothane, and Xamax are the most directly relevant US choices. For glass and photovoltaic, Ahlstrom and Flexlink lead. For archival, jewelry, and small-run conversion, RP Andrews, Hemptique, and EMI dominate. Match the supplier to your specification, demand documentation, and run a sample before signing a supply agreement.