The Tesa unit, which makes adhesives for the automotive and electronics industries, reported sales growth of just 1.2% between January and September, after stripping out currency effects and acquisitions, down from 2.4% in the first half of 2019.
Suppliers to the auto industry are being hit by a slump in production as demand falls in the world's biggest car market China and as a trade war between Washington and Beijing curbs global economic growth.
Cutting its forecast for Tesa's 2019 sales growth to 1-2% from 3-4% previously, Beiersdorf said the unit, which accounts for about 20% of sales, saw growth in its retail consumer business and the electronics sector but a fall in the automotive business, particularly in North America.
Growth at Tesa should pick up again in the fourth quarter, finance chief Dessi Temperley told analysts, citing a good order pipeline.
Beiersdorf confirmed its overall 2019 guidance for group sales growth of 3-5% and a consolidated operating margin from ongoing operations of around 14.5%. It also narrowed the sales forecast for its consumer business to 4-5% from a previous 3-5%.
Shares in Beiersdorf were down 1% at 0904 GMT.
Sales growth for the company's core Nivea brand slowed to 2.7% in the third quarter from 3.2% in the first half, while growth for premium La Prairie skin products dipped to 14% in the quarter, from 27% in the first half, as sales fell in Hong Kong where tourists have been put off by months of political unrest.
However, sales picked up for the Eucerin and Aquaphor skin brands and for Beiersdorf's Hansaplast and Elastoplast sticking plaster lines, with a new patented Eucerin formula that reduces the appearance of dark skin spots selling well around the world.
As consumers move away from mass-market labels like Nivea, new Chief Executive Stefan De Loecker has set up an innovation unit to develop new "indie" brands, including a new line of body creams for tattooed skin launched in September.
Beiersdorf is also tapping into demand for products with more "natural" ingredients, launching the Florena line of "fermented" skincare in Italy and France, as well as a new Nivea product range called "Naturally Good" to be launched in France.
"In times of a challenging and very competitive market environment, it is more important than ever to adapt our business model to new economic and technological conditions," De Loecker said. "The needle is moving in the right direction."
Overall, the company reported organic sales growth of 4.3% for the first nine months, compared to 4.8% in the first half, with third-quarter sales at 1.89 billion euros ($2.09 billion), versus average analyst forecasts for 1.91 billion euros.
($1 = 0.9019 euros)
(Reporting by Emma Thomasson; Editing by Tassilo Hummel and Kirsten Donovan)
By Emma Thomasson