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D6149-97 – Standard Test Method Technical Guide
📖 Scope and Classification of Newsprint
ASTM Designation D 6149 – 97 covers the standard specification for newsprint, including virgin, recycled, and recycled content newsprint. It establishes the criteria for fiber composition, physical properties, and classification of paper used primarily in newspaper printing.
According to the standard, newsprint is defined as uncoated paper containing no less than 65% by weight of wood fibers obtained from a mechanical or chemi-mechanical process. The paper must be unsized or very lightly sized, with a surface roughness exceeding 2.5 µm as measured by the Parker Print-Surf method (1 MPa).
💡 Market Trend Note: While the standard defines a grammage range of 40 to 65 g/m², it acknowledges a market trend toward lower basis weights. Section 8.4 of the standard has been added to recognize the emergence of newsprint weighing less than 40 g/m².
The newsprint is classified under two styles: Style I (roll) and Style II (sheet). Classifications can also be made by basis weight/grammage.
⚙️ Physical Requirements and Material Composition
The standard outlines specific physical requirements to ensure uniform printability and handling characteristics. The key property is surface roughness. To avoid the wicking and dot gain issues common with smoother substrates, the Parker Print-Surf (1 MPa) roughness must exceed 2.5 µm on each side of the sheet.
Grammage tolerance is strictly defined. The sheet shall not weigh less than 40 g/m² and not more than 65 g/m².
| 📏 Property | 🎯 Requirement | ⚡ Test Method |
|---|---|---|
| Grammage (Basis Weight) | 40 – 65 g/m² | ASTM D646 / TAPPI T410 |
| Surface Roughness (PPS, 1 MPa) | > 2.5 µm (each side) | TAPPI T555 |
| Fiber Content (Mechanical/Chemi-mechanical) | ≥ 65% by weight | ASTM D1030 / TAPPI T401 |
The fiber composition is critically important. No less than 65% of the total fiber content must consist of wood fibers originally obtained by a mechanical or chemi-mechanical process. The specific recycled fiber content is to be strictly agreed upon between the buyer and seller as per the ordering information requirements.
📌 Critical Distinction: The roughness requirement (> 2.5 µm) effectively excludes machine-finished or coated papers, ensuring the standard applies strictly to the porous, rougher surface profile characteristic of traditional newsprint. This aligns with the definitions found in the Harmonized Tariff Schedule of the United States (Chapter 48).
🧪 Referenced Documents and Test Methods
ASTM D6149-97 relies on a well-established framework of ASTM, TAPPI, and ISO standards for quality verification. Samples must be obtained in accordance with ASTM D585 (Practice for Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard, and Related Products).
The Grammage is determined using ASTM D646 or TAPPI T410. Fiber analysis is conducted per ASTM D1030 or TAPPI T401. Additionally, optical properties such as brightness (ISO 2470) and diffuse reflectance factor (ISO 2469) are referenced. The standard also references the Harmonized Tariff Schedule for classification purposes and ANSI MH10 for bar code symbols on transport packages.
| 🟦 Standard | 📐 Title / Application |
|---|---|
| ASTM D585 | Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard |
| ASTM D646 / TAPPI T410 | Grammage of Paper (Mass per Unit Area) |
| ASTM D1030 / TAPPI T401 | Fiber Analysis of Paper and Paperboard |
| TAPPI T555 | Roughness of Paper (Print-Surf Method, 1 MPa) |
| ISO 2470 | Measurement of Diffuse Blue Reflectance Factor (ISO Brightness) |
For ordering information, the buyer and seller must agree on grammage, roll diameter, roll width, core size and type, and packaging requirements. The standard provides a comprehensive framework to ensure consistency across the supply chain, from virgin fiber mills to recycling facilities producing recycled content and 100% recycled newsprint.
🎯 Compliance Note: Because the definition of newsprint in Section 3.1.1 conforms exactly to the Harmonized Tariff Schedule of the United States (1996), this standard provides a legally sound technical basis for customs classification and trade documentation.
❓ Frequently Asked Questions
🔍 What is the specified grammage range for newsprint under ASTM D6149-97?
The standard specifies that the sheet shall weigh no less than 40 g/m² and no more than 65 g/m². However, an addendum (Section 8.4) recognizes the industry trend toward lower basis weights.
💡 What percentage of the total fiber content must be mechanical or chemi-mechanical?
No less than 65% by weight of the total fiber content must consist of wood fibers originally obtained by a mechanical or chemi-mechanical process. The remainder and the recycled fiber content are to be agreed upon between the buyer and seller.
⚡ What is the Parker Print-Surf roughness requirement for newsprint?
The surface roughness on each side of the sheet, measured by the Parker Print-Surf method at a pressure of 1 MPa, must exceed 2.5 µm (microns). This ensures the paper is sufficiently porous and rough for ink absorption.
📌 How does ASTM D6149-97 address recycled newsprint?
The scope of the standard explicitly covers “Newsprint Including Newsprint Manufactured from Recycled Fiber.” The specific fiber content and recycled fiber content are to be agreed on as part of the ordering information (Section 5 and 6). Fiber analysis to verify composition is performed per ASTM D1030 or TAPPI T401.