High-performance MDF to revolutionize the composite panel industry.

First and foremost, what CalPlant I will produce is high-performance MDF—an important raw material commonly used to make furniture, kitchen cabinets, store fixtures, doors, mouldings and flooring substrates. A proven composite building product with growing applications, MDF panels have traditionally been produced by pressing wood fibers together, under heat and pressure, utilizing a urea formaldehyde resin system.

CalPlant’s MDF, in contrast, will be produced with zero added formaldehyde, which will guarantee compliance with new Federal TSCA Title VI regulations on formaldehyde emissions from composite panels (based on the stringent CARB 2 standards established in 2007). And, CalPlant I MDF will be manufactured with an extremely consistent and abundant pipeline of raw material, annually renewable rice straw – a byproduct of California’s rice industry. And like wood, rice straw is a cellulosic material, enabling CalPlant to produce MDF that offers all the same characteristics as conventional, wood-based MDF.

In addition to its formaldehyde-free adhesive system, CalPlant’s operations will produce significantly less volatile organic compound (VOC) emissions due to its feedstock and is expected to be a minor source of emissions under EPA rules. And, its reclamation of approximately 20 percent of the Sacramento Valley’s rice straw waste will also result in significant savings of the water now used to flood fields for decomposing straw after the annual harvest.

This is the MDF of the 21st Century.


CalPlant I is located in Willows, California, on the I-5 corridor, approximately 85 miles north of Sacramento.

It is a premium, no-added-formaldehyde MDF manufactured with annually renewable rice straw fiber, a byproduct of the rice harvest each season.

All fiber for the operation will be procured annually within 15-25 miles of the plant location.

Siempelkamp, a global leader of composite panel manufacturing technology, is the equipment designer, manufacturer and installation supervisor during plant construction.

The Generation 9 Siempelkamp press is 10 feet wide and 115 feet long (35 meters).

Designed capacity is approximately 140 million square feet on a ¾” basis.