Newsprint.

Newsprint is the world's most unassuming paper — and, until recently, its most consumed. At 40–52 g/m², it is the lightest-weight commercial printing grade made at industrial scale, engineered for a single constraint: lowest possible cost per printed page. The sheet is uncoated, made primarily from mechanical or thermomechanical pulp that retains its lignin, and it yellows visibly within months of manufacture under UV exposure. None of those traits are accidents. The lignin is there because removing it would raise the cost. The lightness is there because newsprint was always sold by the tonne, and every gram shaved is profit. The yellowing is a known trade-off that the newspaper industry lived with for over a century because the economics left no room for chemistry that might slow it. What this grade WPI-g-000869 bought was volume — at its peak around the year 2000, roughly 40 million tonnes of newsprint moved through global markets annually. By 2023 that figure had collapsed to somewhere near 15 million tonnes, and the trajectory is still declining.

What it's used for

The canonical application is the daily newspaper. Every broadsheet, tabloid, and commuter free sheet printed in cold-set offset ink has run on newsprint for over a century. The grade is optimised for that process: its open, bulky surface absorbs cold-set ink by capillary action as the paper passes between the impression cylinder and blanket, eliminating the heat-set dryer unit entirely. Speed and cost are the whole equation.

Beyond newspapers, newsprint underpins a wider family of low-margin print products: free advertising circulars (penny savers, flyer packs, supermarket supplements); mass-market paperback book blocks; comic books from the Golden Age of the 1930s through the 1990s. The "pulp" in pulp fiction refers directly to the mechanical wood pulp in this grade's feedstock — it named an entire literary genre. Packaging void-fill, furniture-protection wrap, and moving-company cushioning round out the secondary applications.

The structural collapse of 2005–2025 is the dominant fact in newsprint markets. Newspaper print circulation peaked globally around 2007 and has fallen by roughly 70% in developed markets since. FAO data tracks global newsprint production from approximately 40 million tonnes in 2000 down to roughly 15 million tonnes by 2023. North American newsprint capacity shrank by over 60% over the same period; European mills that once exported newsprint were converting to packaging grades. Asian markets — India, Southeast Asia — held volume longer, but the direction was the same everywhere. Recycled-content newsprint has found secondary routes into commodity packaging fillers, but those markets pay packaging prices, not print prices, and the revenue consequence for mills has been severe.

Origins and history

The invention of cheap mechanical wood-pulp paper is one of the genuinely pivotal moments in the history of print — and it has two legitimate claimants who worked independently and nearly simultaneously.

Charles Fenerty (1821–1892), a Nova Scotia farmer and self-taught experimenter from Sackville, near Halifax, demonstrated a workable groundwood paper sample from spruce wood in 1844. He did not patent his method; as a result his priority claim spent most of the 20th century overlooked in favour of the European patent holder. On the other side of the Atlantic, Friedrich Gottlob Keller (1816–1895), a weaver in Kühnhaide, Saxony, independently developed a mechanical wood-grinding process and filed a German patent in 1845 with paper manufacturer Heinrich Voelter. Voelter commercialised the process at industrial scale; Keller thus typically receives the attribution in European industrial history.

Before 1844–1845, all paper was rag paper — made from worn linen, hemp, and cotton cloth. Rag supply was finite and inelastic. The growth of literacy and mass-circulation penny newspapers in the 1830s–1840s was visibly bottlenecked by paper cost. Both Fenerty and Keller broke that bottleneck.

Commercial consequences followed rapidly. By the 1880s, Ottmar Mergenthaler's Linotype machine (patented 1884) had industrialised typesetting; cheap groundwood newsprint had already industrialised paper supply. Their combination created the golden age of the daily newspaper: metropolitan papers grew from single-sheet broadsheets to multi-section products running millions of copies. By 1900 the daily newspaper was the dominant mass medium in every industrialised country.

The 20th century's main technical evolution was the shift from pure groundwood to thermomechanical pulp (TMP), developed in the 1960s–70s. In TMP, wood chips are pre-steamed under pressure at 120–160 °C before disc-refining. Thermal softening of the lignin allows fibres to separate with less mechanical damage — better fibre length, higher tear strength, faster machine speeds. TMP displaced stone groundwood in most newsprint mills through the 1980s.

Incorporation of recycled old newsprint (ONP) was the second major shift: by the 1990s, municipal recycling streams provided consistent ONP feedstock. De-inking capacity was added at mills, and newsprint grades today commonly carry 40–70% recycled content by weight.

How it's made

Standard newsprint furnish is a blend of thermomechanical pulp (TMP) and recycled old newsprint (ONP) in proportions that vary by mill and fibre economics: a Nordic mill might run 70% TMP / 30% ONP; a North American mill nearer to ONP supply might invert that ratio; low-cost South Asian mills often run 80–90% ONP, accepting lower brightness for cost.

The defining feature of mechanical pulping — and what governs both the paper's economics and its ageing behaviour — is the absence of chemical lignin removal. In the kraft process used for virgin fibre grades like WPI-g-000888 or woodfree papers WPI-g-000875, chips are cooked in caustic liquor at high temperature to dissolve and remove lignin before fibres are separated. In mechanical pulping there is no cooking stage. Fibres are separated physically — by stone grinders (groundwood) or thermally softened disc refiners (TMP). Lignin stays in the bundle. Pulp yield is high (90–95% of wood dry weight vs 45–50% for kraft), which is why the process is cheap. The retained lignin is photosensitive: chromophoric structures oxidise under UV exposure and turn yellow or brown. The yellowing of a newsprint clipping is lignin photodegradation, not ink degradation — and no surface treatment short of a UV-barrier coating stops it.

When ONP is incorporated, a de-inking circuit is added: bales of old newsprint are re-pulped with mild alkali and surfactant, ink particles are floated off by dissolved air flotation (DAF), and the cleaned pulp is blended into the TMP stream at the headbox. The paper machine itself is typically a Fourdrinier or twin-wire former running at 1,800–2,500 m/min — among the fastest in any commercial grade.

Specs that distinguish it

The numbers that separate newsprint from adjacent printing grades:

• Basis weight — 40–52 g/m² standard; 45 g/m² is the most widely traded specification.
• Opacity — 90–94% at 45 GSM, achieved through high bulk and light-scattering from retained lignin fines — not fillers or coatings. High for its weight class.
• ISO brightness — 55–62% in modern grades; distinctly cream-white, far below the 80–96% of woodfree grades WPI-g-000875.
• Bulk — 1.4–1.6 cm³/g. Newsprint is one of the bulkiest grades in commercial printing. The high bulk comes from the mechanically intact fibre structure: TMP fibres are round, spring-shaped, and incompressible compared to kraft fibres, which are flat and ribbon-like. Bulk is valuable because it gives the newspaper physical presence — perceived thickness — at very low weight.
• Tensile index (MD) — 25–35 N·m/g (ISO 1924-2). Substantially lower than kraft or woodfree grades at comparable weight. The reduced tensile is a consequence of short, damaged fibres and limited inter-fibre bonding in a lignin-rich furnish.
• Printing process — Cold-set offset. Ink dries by absorption into the porous, uncoated surface; no heat-set dryer is used. Heat-set printing on newsprint causes blistering.

Variants and family

The newsprint family is narrow by design — the grade is a commodity, and differentiation is limited.

Standard newsprint (45 g/m²) is the commodity benchmark: ONP/TMP furnish, 55–60% ISO brightness, 90–93% opacity. This is what trades on international exchange in Latin America, South Asia, and Africa.

Improved newsprint (48–52 g/m²) blends in 20–30% chemical pulp — bleached kraft or sulphite — for better tear strength, reduced lint, and a higher brightness ceiling (60–68% ISO). Quality national newspapers use it when they want better colour reproduction without moving to coated stock.

Coloured newsprint — pink for financial papers (Financial Times, Il Sole 24 Ore), green for sports sections — uses pH-stable dyes added to the furnish. These variants have held volume better than white newsprint because the brand differentiation has no digital substitute; they command a 5–12% premium.

At the upper end of the spectrum sits the newsprint-adjacent printing family WPI-g-000871: the lightest SC (supercalendered) magazine papers overlap with improved newsprint at 48–56 g/m² and mark the transition from cold-set to heat-set and gravure printing.

Buying notes

For print publishers, three checks matter.

Brightness stability under UV. Initial ISO brightness doesn't tell you how fast the sheet yellows on a newsstand. Ask for a post-exposure test (TAPPI T-452) after 16–24 hours UV lamp exposure — a 60% ISO sheet can drop to 48% after a weekend under fluorescent light. That gap drives advertising quality complaints.

CD tensile for stacking. Stacked edition pallets put lateral load on the sheet edge. Poor cross-direction tensile causes edge-crack failures at the press. Specify CD tensile alongside the more common MD figure.

ONP content and regulatory position. For EU buyers under Green Procurement or EPD commitments, ONP percentage drives lifecycle carbon figures — but higher ONP fractions also introduce fines variability that affects ink holdout. Know your trade-off before specifying 80%+ ONP on quality runs.

For secondary buyers (moving companies, void-fill purchasers): standard newsprint is acidic (pH 5.0–6.0). Prolonged contact with photographs, archival documents, or silver-plated objects will cause staining. Acid-free alkaline newsprint (pH 7.0–8.5) exists and should be specified for archival-safe applications.

Sources

• Fenerty, C. — Nova Scotia Mechanics' Institute demonstration of groundwood pulp, 1844. Nova Scotia Archives: https://novascotia.ca/archives/virtual/fenerty/
• FAO — Pulp and Paper Capacities Survey 2022–2027. https://www.fao.org/forestry/statistics/84922/en/
• TAPPI TIP 0404-62 — Newsprint manufacture: mechanical and thermomechanical pulp processes. https://www.tappi.org/content/SARG/0404-62.pdf
• ISO 2470-1:2016 — Paper, board and pulps: Measurement of diffuse blue-reflectance factor (ISO brightness). https://www.iso.org/standard/62343.html
• WAN-IFRA — World Press Trends 2023. https://wan-ifra.org/reports/world-press-trends-2023/