Scientific Name
Schinopsis lorentzii
Trade Name
Paag
Family Name
Anacardiaceae
Common Names
Paag, Quebracho, Quebracho colorado, Quebracho cornillo, Real quebracho, Santiagueno, Soto negro
Regions of Distribution
Latin America
Countries of Distribution [VIEW MAP]
Argentina, Bolivia, Brazil, Paraguay
Common Uses
Axles, Bridge construction, Flooring, Flooring: industrial heavy traffic, Fuelwood, Handles: general, Heavy construction, Joinery, Ladders, Light construction, Marine construction, Mine timbers, Piling, Poles, Posts, Railroad ties, Sporting Goods, Turnery, Vehicle parts
Heartwood Color
| Brown | ||||||||||||
| Yellow | ||||||||||||
| Pink | ||||||||||||
| Red | ||||||||||||
| Pale red to pink | ||||||||||||
| Reddish brown | ||||||||||||
| Brown, red, dark reddish brown with nearly black stripes after prolonged exposure |
Sapwood Color
| Brown | ||||||||||||
| Yellow | ||||||||||||
| White to yellow | ||||||||||||
| Well defined | ||||||||||||
| Pinkish |
Grain
| Figure | ||||||||||||
| Interlocked | ||||||||||||
| Other (figure) | ||||||||||||
| Stripe (figure) |
| Interlocked | ||||||||||||
| Other figure | ||||||||||||
| Striped figure |
Texture
| Medium | ||||||||||||
| Fine |
Luster
| Lustrous | ||||||||||||
| Slightly lustrous |
Natural Durability
| Very durable | ||||||||||||
| Resistant to attack from marine borers | ||||||||||||
| Susceptible to attack from powder post (Lyctid & Bostrychid) beetles | ||||||||||||
| Pinworms (ambrosia beetles) may be present in the felled log |
Light-Induced Color Change
| Darker |
Toxicity
| Dermatitic effects | ||||||||||||
| Respiratory effects |
Drying Defects
| Splitting | ||||||||||||
| Checking | ||||||||||||
| Severe twisting/warping | ||||||||||||
| Severe surface checking | ||||||||||||
| Moderate twist/warp | ||||||||||||
| Moderate surface checking |
Ease of Drying
| Slowly | ||||||||||||
| Thick Stock Requires Care | ||||||||||||
| Reconditioning Treatement |
Tree Identification
| Bole/stem form is straight | ||||||||||||
| Bole/stem form is misshapen |
Boring
| Fairly difficult to very difficult |
Carving
| Fairly Difficult to Very Difficult |
Cutting Resistance
| Easy to saw | ||||||||||||
| Cutting Resistance with green wood is difficult | ||||||||||||
| Cutting Resistance with dry wood is difficult |
Gluing
| Fairly Easy to Very Easy | ||||||||||||
| Fair to Good Results |
Mortising
| Fairly Difficult to Very Difficult |
Moulding
| Fairly Difficult to Very Difficult | ||||||||||||
| Poor moulding results |
Nailing
| Pre-Boring Recommended | ||||||||||||
| Fair to Good Results | ||||||||||||
| Fairly Easy to Very Easy | ||||||||||||
| Possible if prebored |
Planing
| Fairly Difficult to Very Difficult |
Resistance to Impregnation
| Resistant sapwood | ||||||||||||
| Resistant heartwood |
Response to Hand Tools
| Responds Poorly | ||||||||||||
| Difficult to machine |
Routing & Recessing
| Fairly Difficult to Very Difficult |
Screwing
| Possible if prebored |
Turning
| Fairly Difficult to Very Difficult | ||||||||||||
| Easy to turn |
Polishing
| Fair to Good Results | ||||||||||||
| Good results | ||||||||||||
| Satisfactory results |
Staining
| Finish is generally good |
Strength Properties
| Density (dry weight) = 67-75 lbs/cu.ft | ||||||||||||
| Density (dry weight) = >75 lbs/cu. ft | ||||||||||||
| Density (dry weight) = 61-67 lbs/cu. ft | ||||||||||||
| Modulus of Elasticity (stiffness) = high | ||||||||||||
| Max. crushing strength = high | ||||||||||||
| Bending strength (MOR) = high |
Numerical Data
| Item | Green | Dry | English |
| Bending Strength | 13576 | 20956 | psi |
| Density | 57 | lbs/ft3 | |
| Maximum Crushing Strength | 6899 | 9945 | psi |
| Stiffness | 2167 | 2494 | 1000 psi |
| Weight | 57 | 56 | lbs/ft3 |
| Item | Green | Dry | Metric |
| Bending Strength | 954 | 1473 | kg/cm2 |
| Density | 913 | kg/m3 | |
| Maximum Crushing Strength | 485 | 699 | kg/cm2 |
| Stiffness | 152 | 175 | 1000 kg/cm2 |
References
Berni, C.A., Bolza, E., Christensen, F.J.,1979,South American Timbers – The Characteristics, Properties and Uses of 190,Species,C.S.I.R.O Div. Building Research
Howard, A.L.,1948,A Manual of Timbers of the World.,Macmillan & Co. Ltd. London 3rd ed.
Kryn, J.M.,1954,Quebracho, Quebracho Colorado, Quebracho Macho-Schinopsis lorentzii Engl,and Schinopsis balansae Engl,U.S.A. Department of Agriculture, Forest Products Laboratory, Madison,Information Leaflet, Foreign Woods Report No 1969
Patterson, D.,1988,Commercial Timbers of the World, 5th Edition,Gower Technical Press
Record, S.J., Hess, R.W.,1943,Timbers of the New World,Yale University Press
Record, S.J.,1939,American Woods of the Family Anacardiaceae,Tropical Woods,8(60,pp11-45
Tortorelli, L.,1956,Maderas y Bosques Argentinos,Editorial Acme S.A.C.I. Buenos Aires
Woods, R.P.,1949,Timbers of South America,TRADA, Red Booklet Series