Naphthalene Balls Manufacturing Plant Project Report (DPR) 2026

What are naphthalene balls?

Naphthalene balls, widely sold as mothballs, are small white spheres of compressed or cast naphthalene, a two-ring aromatic hydrocarbon that slowly turns from solid to vapor at room temperature. The vapor kills or repels clothes moths, carpet beetles and their larvae in closed storage, which is why the balls go into airtight chests, garment bags and wardrobes. Commercial grades are usually 99% or purer naphthalene, sometimes with a trace of fragrance, and are sold in 100–500 gram consumer packs, in bulk cartons and, across parts of Asia, the Middle East and Africa, as deodorizing balls for urinals and drains.

In most regulated markets the product is a pesticide rather than a general household chemical. Swallowing balls or breathing heavy vapor can cause hemolytic anemia, with small children and people with an inherited G6PD enzyme deficiency most at risk, and the World Health Organization's cancer agency classifies naphthalene as possibly carcinogenic to humans. Paradichlorobenzene, cedar and pyrethroid strips are the main substitutes.

In trade, mothballs put up for retail sale fall under HS 3808.91, insecticides, which replaced subheading 3808.10 in the 2007 Harmonized System. Refined naphthalene flakes, the main input, fall under HS 2902.90, and crude coal tar naphthalene under 2707.40.

Naphthalene balls market overview and global demand

Naphthalene balls are a small, mature outlet for a much larger chemical. Credence Research's refined naphthalene market analysis puts the feedstock at about USD 1.71 billion in 2025, based on its USD 1.62 billion for 2024 and a 5.69% CAGR through 2032, with most volume going to phthalic anhydride, naphthalene sulfonate concrete admixtures and dye intermediates rather than moth control. On the shelf, mothballs compete within a household pest category that the company's household insecticides report values at USD 18.3 billion in 2024.

Physical volumes show how niche moth control has become in high-income markets. An International Agency for Research on Cancer monograph estimated that only about 6,500 tonnes of naphthalene went into moth-proofing and fumigation in 2000, including 5,000 tonnes in Europe, 1,100 in Japan and 450 in the United States, against world naphthalene output of around 1 million tonnes in the late 1980s. The European share has since vanished, because naphthalene moth repellents have been prohibited across the European Union and the United Kingdom since 2008.

Demand now rests on three pillars. The United States keeps a regulated, brand-led market of EPA-registered products. South Asia, Southeast Asia, the Middle East, Africa and Latin America buy far more by volume, often low-priced loose or bagged balls used in wardrobes, bathrooms and drains. Exporters in China and India supply private-label packers across these regions.

Feedstock is tightening in the West. Most naphthalene is distilled from coal tar produced by steel-industry coke ovens, and Koppers cited declining coal tar availability when it decided to end phthalic anhydride output at Stickney, Illinois, in 2025. Supply is moving toward Asian distillers tied to coke output in China and India.

Naphthalene balls manufacturing process

Ball making is a physical conversion, not a chemical synthesis. Most new plants buy refined naphthalene flakes and shape them, either by compression in rotary presses or by melting and casting in molds. This overview models compression, which gives harder, glossier balls with less vapor loss and avoids handling molten naphthalene, whose flash point of about 79 °C sits just below its melting point of about 80 °C.

1. Receiving and testing. Flakes arrive in lined 25-kilogram sacks or jumbo bags and are checked for purity, melting point, color and sulfur-bearing impurities such as thionaphthene, which spoil odor.
2. Crushing and sieving. Lumps that form in storage are broken in a low-speed crusher and screened, so the presses receive granules of even size, which keeps ball weight consistent.
3. Blending. For scented grades, a small dose of fragrance, such as a cedar or lavender note, is mixed in a closed ribbon blender.
4. Pressing. Multi-station rotary presses with hemispherical punches compact the granules into spheres of a few grams each. Operators check weight, hardness and surface finish every shift.
5. Polishing. A rotating drum removes the seam flash and dust left by the press, and the fines return to the feed hopper.
6. Packing. Balls go into vapor-tight pouches, boxes or blister cards with tamper-evident seals, then into cartons and onto pallets.

Design turns on safety and vapor loss. First, naphthalene dust and vapor are flammable and toxic, so the building needs local exhaust ventilation with activated-carbon or scrubber treatment, explosion-proof motors, grounding against static and strict hot-work control. Second, product escapes to the air at every step, so closed transfers, sealed storage and fast packing protect both margin and workers. Some small South Asian units still melt flakes at about 88 °C and pour them into molds, as an Indian government micro-enterprise profile describes, but cast balls crack more easily and the open melt raises exposure.

Naphthalene balls plant setup cost

This overview models a greenfield plant pressing 2,400 tonnes of naphthalene balls a year, about 8 tonnes a day over 300 days, at an estimated CapEx of USD 1.2–5.5 million excluding working capital. The low end reflects Chinese-built presses and a basic shed in an Asian industrial park. The high end reflects a new building with full vapor and dust control at a U.S. site.

Supplier listings anchor the estimate, showing small rotary presses able to make camphor and naphthalene balls at about USD 3,200 a set, with 21-station industrial models rated at 15,000–45,000 pieces an hour. At an assumed 4 grams a ball and a practical 20,000 pieces an hour, one press makes about 80 kilograms an hour, so the plant needs six to seven presses on two shifts. At an assumed USD 10,000–25,000 per industrial press, pressing costs only USD 70,000–175,000. Most CapEx goes into the building, ventilation and packing lines, which is why site choice moves the total more than machinery does.

Worked example, land and site development. The model uses an assumed 5,000–8,000 square meters for the press hall, flake store, finished goods warehouse and truck access. At an assumed USD 30–80 per square meter in an Asian industrial park, the plot costs about USD 150,000–640,000, and at an assumed USD 60–200 at a U.S. site, about USD 300,000–1.6 million. That puts land at roughly 12–29% of CapEx, a large share because the process plant itself is light.

Working capital adds an estimated USD 0.8–1.2 million, mostly about two months of naphthalene stock and 60 days of receivables from distributors. Product registration and label approval costs, which vary sharply by market, sit inside pre-operating expenses.

Naphthalene flakes make up about three-fifths of operating cost, and a 10% rise in their price takes about 5 points off gross margin at the mid-range selling price. A long-term supply contract with a coal tar distiller therefore matters more than any other line. The full report can be customized to any country or region.