Naphtha supply squeeze forces Kao, Unicharm and Daio Paper to raise prices on diapers and sanitary goods
Kao, Unicharm and Daio Paper will raise prices on diapers, sanitary goods and detergents as naphtha shortages push up raw-material costs across Japan now.
Kao Corp. and other major manufacturers announced staggered price increases on sanitary products, disposable diapers and related household items after a surge in costs for naphtha-derived materials. The company told retail partners it will implement phased hikes to protect supply stability and offset sharply higher input prices. The moves follow similar decisions by Daio Paper and Unicharm, signaling a wider industry response to persistent naphtha disruptions.
Major manufacturers outline staggered timetable
Kao said it will begin gradual price increases for laundry detergents and skincare items in July, with sanitary products and diapers to follow in September. The company described the adjustments as necessary to maintain stable shipments of daily necessities amid higher procurement costs. Daio Paper announced a separate plan to raise prices by at least 15% on household and commercial paper products, with increases applied to shipments starting in August.
Unicharm also confirmed a July start for price rises on diapers and sanitary napkins, saying it would combine cost pass-through with efforts to enhance product value. These timelines indicate manufacturers are coordinating adjustments across product lines rather than imposing abrupt single-step hikes. Retailers and distributors are being notified in advance to smooth inventory and shelf-price transitions.
Naphtha-derived materials driving the cost surge
Industry officials point to naphtha as the common thread behind the increases, with the feedstock used to produce non-woven fabrics, superabsorbent polymers and many surfactants. Those inputs are fundamental for disposable diapers, sanitary pads, wipes and a wide range of cosmetics and detergents. Disruptions to naphtha supplies, linked to a deteriorating situation in the Middle East, have compressed availability and driven spot prices higher, raising manufacturing costs downstream.
Printing inks and packaging materials that contain petroleum-derived components have also been affected, prompting companies to seek conservation measures. Manufacturers say the compound effect of higher polymer, film and chemical costs has pushed margins to unsustainable levels for some categories, making price adjustments unavoidable to preserve continuous supply.
Packaging and product measures to reduce petroleum use
Some companies are pursuing alternatives to immediate price increases by modifying packaging and formulations to cut petroleum usage. Calbee, for example, will switch packaging for 14 flagship snack items, including its Potato Chips and Kappa Ebisen, to black-and-white “petroleum-saving” designs beginning with the next shipments. Firms say such packaging changes can reduce ink and film demand while communicating conservation efforts to consumers.
Kao and other makers are also evaluating material substitutions and process efficiencies, though the options have limits for products that require specific performance characteristics, such as absorbency and skin safety. Industry sources note that any large-scale material shift would require requalification and regulatory checks, so short-term tactics focus on packaging changes and measured price pass-through.
Retail and consumer implications
Retailers are preparing for phased retail-price adjustments and working with suppliers to manage stock and promotions through the summer and autumn. Supermarkets and drugstore chains told procurement teams to expect contract amendments and to plan markdowns or promotional pauses where necessary to avoid sudden price spikes in-store. Consumer groups warned that cumulative increases across diapers, sanitary goods and detergents could meaningfully raise household living costs, particularly for younger families and elderly care providers.
Economists say the immediate inflationary pressure from these goods will be uneven but visible in monthly household expenditure surveys, and they stress that persistent elevated crude and feedstock prices could sustain upward pressure on consumer prices. Households are being advised to compare unit prices and consider bulk purchasing only when product shelf life and storage permit.
Outlook and uncertainty tied to global supply
Manufacturers and analysts agree the outlook hinges on the stability of naphtha supply and global crude market developments. Companies emphasized that the announced price hikes are not unilateral profit moves but measures to keep production and distribution on track amid volatile upstream markets. They also stressed the potential for further adjustments if feedstock costs remain elevated or if logistical bottlenecks worsen.
Trade groups and some suppliers indicated they will continue discussions with government agencies about supply-chain resilience and possible relief measures, such as strategic procurement coordination. For now, companies plan staggered, communicated increases and packaging adaptations while monitoring market signals and working to limit disruption for consumers.
As these measures take effect in July through September, households and retailers will watch whether the phased approach and conservation efforts moderate the overall burden or whether additional cost pressures force further price revisions later in the year.
