Pau Ferro (Machaerium spp.)
Pau Ferro (Machaerium spp.)

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Common Name(s): Pau Ferro, Morado, Bolivian Rosewood, Santos Rosewood

Scientific Name: Machaerium spp. (Machaerium scleroxylon)

Distribution: Tropical South America (mainly Brazil and Bolivia)

Tree Size: 65-100 ft (20-30 m) tall, 3-5 ft (1-1.5 m) trunk diameter

Average Dried Weight: 54 lbs/ft3 (865 kg/m3)

Specific Gravity (Basic, 12% MC): .70, .87

Janka Hardness: 1,960 lbf (8,710 N)

Modulus of Rupture: 17,750 lbf/in2 (122.4 MPa)

Elastic Modulus: 1,574,000 lbf/in2 (10.86 GPa)

Crushing Strength: 8,830 lbf/in2 (60.9 MPa)

Shrinkage: Radial: 2.8%, Tangential: 6.7%, Volumetric: 9.9%, T/R Ratio: 2.4

Color/Appearance: Color can be highly varied, ranging from reddish/orange to a dark violet/brown, usually with contrasting darker black streaks. Narrow sapwood is a pale yellow and is clearly demarcated from the heartwood.

Grain/Texture: Grain is typically straight, though sometimes slightly irregular or interlocked depending on the species. Fine, even texture and a naturally high luster—though depending on the particular species, the wood can have a coarser, more fibrous texture.

Endgrain: Diffuse-porous; medium pores in no specific arrangement, moderately numerous; solitary and radial multiples of 2-3; mineral deposits occasionally present; parenchyma banded, diffuse-in-aggregates, vasicentric; narrow rays, spacing close.

Rot Resistance: Rated as very durable, though quite susceptible to insect attack, and not recommended in direct ground contact.

Workability: Pau Ferro is considered overall to be of fair workability, as it can blunt the cutting edges of tools, and any irregular grain has a tendency to tearout during machining operations. Also, many of the same challenges in gluing rosewoods are common to Pau Ferro as well. Pau Ferro turns and finishes well.

Odor: Depending on the species, the wood can have a characteristic scent.

Allergies/Toxicity: Although severe reactions are quite uncommon, Pau Ferro has been reported as a sensitizer. Usually most common reactions simply include eye and skin irritation. Anecdotal evidence suggests that there is a high rate of reaction among woodworkers, and the wood contains the very same sensitizing substances as those found in rosewoods (Dalbergia genus). See the articles Wood Allergies and Toxicity and Wood Dust Safety for more information.

Pricing/Availability: Pau Ferro is in the medium price range for exotic imported hardwoods, and is likely to be much more affordable than some of the scarcer true rosewoods, (Dalbergia genus), of which this wood is often used as substitute.

Sustainability: This wood species is not listed in the CITES Appendices, and many of the species within the Machaerium genus are reported by the IUCN as being of least concern. One exception is Machaerium villosum from Brazil, which is reported as vulnerable due to deforestation.

Common Uses: Veneer, musical instruments, cabinetry, flooring, interior trim, turning, and other small specialty wood objects.

Comments: Pau Ferro is a wood of many names, and is sometimes called Morado: and because the wood is so similar in appearance and working properties to rosewood, it is also sometimes referred to as Bolivian or Santos Rosewood. The wood has been used in various capacities as a substitute for the endangered Brazilian Rosewood. Although the wood is not technically in the Dalbergia genus, it’s in a closely-related genus (Machaerium), and contains the same sensitizing compounds found in rosewoods—about as close to a true rosewood as a wood can get without actually being a Dalbergia species.

Related Species:

None available.

Scans/Pictures:

Pau Ferro (sanded)
Pau Ferro (sanded)
Pau Ferro (sealed)
Pau Ferro (sealed)
Pau Ferro (endgrain)
Pau Ferro (endgrain)
Pau Ferro (endgrain 10x)
Pau Ferro (endgrain 10x)
Pau Ferro and Curly Maple (turned)
Pau Ferro and Curly Maple (turned)
 
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Mick

I make pocket knife handles with this wood all the time and it is one of my favorites to use, it polishes up nice and looks great. I typically just apply beeswax to finish, just finished this one today.

Tyler Eaves

Just got a new Fender Bass with a Pau Ferro board. Got lucky and got one with some rather nice figuring… almost Zebrawood-esque.

Frank P

i am a recorder player and very interested in tonewoods, especially for woodwind instruments. Obviously, becauses of CITES and general sustainability issues, some of the tropical hardwoods such as the Dalbergias are harder to source. I think the German recorder maker Mollenhauer tried to replace Dalbergia nigra with Morado some years back but had to discontinue because of allergic reactions. The rosewoods, in general as used for woodwinds (you put it in your mouth, after all) are somewhat problematic for many players. Usually there are no problems with fruitwoods such as pearwood, plumwood or cherrywood. The tropical hardwoods do produce… Read more »

Leonard J. Mills

Frank,

Can you share how can one make a woodwind instrument, using Rosewood (Dalbergia Latifolia).

Leonard

Gerald

This is in German, but you can see how ebony is turned and drilled, making Irish bagpipes.
https://www.youtube.com/watch?v=bXyaDouUgUY

Joseph Long

I see that American Persimmon is not mentioned as an alternative to some tropical hardwoods.It’s in the Ebony family,is very hard and has been used with fine results as a fingerboard for musical instruments.It could be grown easily throughout the lower 48 states and produces tastey fruit as a by product.It spreads all over the place and forms groves naturally.I think it needs more encouragement as a fine wood.It is not black and some call it blond Ebony.You can stain it black but what’s wrong with the “exotic”American blonde Ebony,as is?

Tyler Eaves

Persimmon has VERY high shrinkage rate. This will cause major problems on a fingerboard when all the frets pop out in winter.

Sean Barry

Hmmm, if persimmon wood was unusually susceptible to shrinkage I doubt that golf club makers would use it for driver clubs. Persimmon is the standard wood for that purpose, because it’s heavy and very impact resistant. If it shrank materially any golf club made with it would likely fall apart at some inopportune time such as during a Master’s tournament. I suspect that shrinkage sufficient to cause the kind of problem you describe for fingerboards results from improperly seasoned wood, or wood glued in place during a period of very high humidity. If the latter, almost any wood will show… Read more »

Santos L Halper

You can’t be serious. Golf ‘woods’ haven’t been made from wood in years aside from replicas of antiques.

And shrinkage effects different shapes and grain alignments differently. What is acceptable for a lump may not be for a plank.

Dan Newland

I am using it to build picture frames and it is gorgeous! I inset Curly Maple to set off the dark red color. All of the joints and slots in the biscuit cut edges were thoroughly cleaned with lacquer thinner until the oil no longer stained the paper towel or Qtip, then glued with epoxy. Ditto for the finish, I wiped it with lacquer thinner then applied sanding sealer twice, sanded with 220 grit between each coat, then 5 coats of Epifanes varnish sanded with 400 grit between coats. The chatoyance is beautiful.

Rich

Using it for electric guitars isn’t a negative. But i is very heavy.

Armand Ruckli

Pau Ferro, although having visual similarities to rosewoods is no rosewood, doesn’t sound like rosewood and doesn’t smell like rosewood. It’s acustically rather dead material..Personally i would not use it for my guitarmaking..except maybe for a headplate if i had nothing better availlable. I think it makes not a good substitute for neither type of true dalbergia rosewoods when it comes to classical or flamenco guitars.

Sean Barry

Actually, pau ferro is one of the most highly regarded woods for the backs and sides of acoustic guitars. It’s in very short supply and finding decent sets large enough even for classical guitars can be problematic. It’s not intended as a rosewood substitute, though the market being what it is, many makers must take pains to reassure clients that the CITES restrictions on rosewood don’t apply to all woods, and further that the CITES terms were not directed personally at that client no matter how wounded that client might feel. Brazilian and Madagascar rosewoods are in the “move on”… Read more »

David

Good response, making a moral and practical point without being overbearing or accusatory.

As to Pau Ferro – I believe that Fender had an announcement years ago they’d start using it across all lines, whereas before it was just in the fretboard of a single bass offering. I would be inclined to believe then that it is a suitable material for guitarmaking.

Robeto

The Morado is an incredible wood. I like simple with oil seemseed.

Scott Dobek

My “Love Keychains” carved in Pau Ferro (Morado, Bolivian Rosewood). Very nice hardwood to work. Tends to lighten over time.

Antonio Bruno

Sou brasileiro e convivo com esta madeira desde que nasci. Na juventude trabalhei em serraria de madeira e posso te garantir que Machaerium Scleroxylonm não é pau ferro. Caesealpinia Ferrea é o pau ferro. No Brasil a Machaerium Scleroxylom é conhecida como Caviúna ou Cabiúna e é a mais incrível das madeiras brasileiras pela sua beleza e resistência.
Devido à dificuldade de se encontrar Caviúna, atualmente vende-se Pau ferro como se fosse Caviúna.
Tenho uma quantidade razoável de Caviúna que adquiri de demolições .

Francisco de Assis Varela Barca Varela Barca

Antonio Bruno. Você tem toda a razão. O Pau Ferro, além da densidade, oferece resistência e flexibilidade. Na região Nordeste é conhecida também como Jucá, usada para cassetes policiais nos tempos idos. Eu já fiz um bodoque de um galho de Jucá, ou pau ferro. Infelizmente e´muito usado para carvão também. Nós tínhamos Pau Ferro na nossa mata, em São Gonçalo do Amarante.

Rickey Brayn

Thanks for the info on T/R Ratios – As you said quarter swan expands the most in a vertical movement, this is why is seems much more stable. I just didn’t know until now that the formula stays the same for the same wood no matter how it is swan! Thanks Rickey

Rickey Brayn

The shrinkage rate of quarter swan wood is more in a radial measurement or height! Instead of a tangential measurement or width measurement! What is the formula for quarter swan verses flat or plain swan wood in T/R terms?

Rickey Brayn

T/R shrinkage rates! We all know quarter swan wood is much more stable than flat swan. But the T/R ratios that we see in the wood data base, which kind of swan wood are they or you getting the T/R ratios from. What is the T/R ratios of flat swan verses quarter swan wood? They have to be different! What is the formula for quarter swan?

LORD METAL

Wood as many notables is a Respectfull species, it will show you your future very precisely as it comes from the undoubtfull past, it’s spirit calculates immaculately. Those of you who use Polyurethane on Instruments should really re-consider your carrer choice. Using poisonous compounds such as Polyurethane (developed as a side product of Zyclon B – the gas that Nazis allegedly used on Jews) WILL MAKE YOUR SKIN MORE PRONE OR SUCCEPTIBLE TO ALLERGIES, NATURAL POISONS AS WELL AS PLAY AN IMPORTANT FACTOR IN THE DEMISE OF YOUR GENERAL HEALTH!!! Stay away from Polyurethane, Nomex, (developed by DuPont also Kevlar,… Read more »

LORD METAL

As a finish one should allways use something that is as close to the wood you are working with as possible with the least possible chemichals involved – make your own oil from Pine leaves if you don’t have any Morado leaves accessible… Beeswax works fine as well go on spend a buck you won’t ever go broke on Beeswax

you will kill millions of Bees using Polyurethane

Joe McCutchon

I had forgotten how bad this wood is to finish until I am nearly done with my current project. It had been about ten years since my last attempt. It’s just so beautiful. I had to take my first coat of undried polyeurethane off. Then I coated with shellac and had a beautiful second coat of polyeurethane which dried nicely, but that marred too easily. Back to the drawing board.

Dave Kimball

Actually I came here to find answers to why my finnish has never dried and you’ve pretty much answered it except I used Shellac on several different types of wood at the same time: Buckeye burl, Redwood lace burl, asian satin wood, Padauk, and of course the morado. All were flat surfaces (guitar picks), all were done at the same time, 5 coats( half hour intervals), 24 hours, flip and repeat except I let them cure for 3 days before I had a chance to look at them…all were dry EXCEPT the Morado, which 3 and a half weeks later… Read more »

John Martin

Cant use polyester on Pau Ferro, it won’t dry without a barrier coat

Lale

Ciao, io uso questo tipo di legname da tempo ma non ho mai avuto problemi. Lo uso nella produzione di sedie e poltroncine di alta qualità. Ciao.Lale

Donnie Fricks

Morado makes me itch pretty bad, too. I’ve never had any problem with Polyurathane finish on this wood, nor any problem gluing. System Three makes an epoxy/resin glue called G-2 that is supposed to work pretty well. I’ve used it but never tested it by dropping it on the floor like a toughbook. However, I did try to pull it apart with my arms and it didn’t budge.

Sebastian Francese

It is my first time working with Pau Ferro, I have used a marine grade, satin oil based varnish (three coats) and it is taking forever to dry does anyone knows why or had a similar experience?

Bill White

This wood gives me a serious skin reaction on my head and neck, but not on my hands (too callused?). It also does not seem to cause any respiratory problems. My head, neck and hands are the only parts of my body exposed when I turn this wood on the lathe. The hives last 24 to 48 hours. So far, I have not found an effective OTC treatment.