Material Safety Data Sheet
Zinc Borate-treated TimberStrand
Weyerhaeuser Company Emergency Phone: (253) 924-5000
PO Box 9777 Additional Information: (253) 924-3865
Federal Way, WA 98063-9777 CHEMTREC: (800) 424-9300
http://www.weyerhaeuser.com/environment/msds/default.asp Revised Date: October 10, 2005
1. Product Identification
Product Manufacturing Location(s)
Zinc Borate-treated TimberStrand庐 USA: Chavies, KY; Deerwood, MN.
Synonyms: column, treated sill plate
2. Hazardous Ingredients/Identity Information
Name CAS# Percent Agency Exposure Limits Comments
PEL-TWA 15 mg/m3
Wood None 93-95 OSHA Total dust
PEL-TWA 5 mg/m3
OSHA Respirable dust
fraction
TLV-TWA 0.5 mg/m3
ACGIH Inhalable, Western
red cedar
1 mg/m3
ACGIH TLV-TWA Inhalable, All other
species
A
5 mg/m3
PEL-TWA Softwood or
Recommended
hardwood total dust
A
PEL-STEL 10 mg/m3 Softwood or
Recommended
hardwood total dust
A
PEL-TWA 2.5 mg/m3 Western red cedar
Recommended
total dust
Resin Solids: B, C
Polymeric 9016-87-9 4-6 OSHA None None
Diphenylmethane ACGIH None
Diisocyanate
(Polymeric MDI) D
Co-Binder B None 0-2 None None None
Borogard庐 ZB 138265-88-0 <1 Zinc borate hydrate
Wood as 鈥淣uisance Dust鈥?:
PEL-TWA 15 mg/m3
Preservative OSHA Total dust
PEL-TWA 5 mg/m3
(Zinc borate Respirable dust
hydrate) E fraction
TLV-TWA 10 mg/m3
ACGIH Inhalable dust
fraction
TLV- TWA 5 mg/m3 Respirable dust
fraction
Paraffin wax B 2 mg/m3
8002-74-2 <1 OSHA PEL-TWA Paraffin wax fume
2 mg/m3
ACGIH TLV-TWA Paraffin wax fume
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2. Hazardous Ingredients/Identity Information (cont鈥檇.)
A
Weyerhaeuser recommended exposure limits based on 1989 OSHA PELs. In 1992, the U.S. Court of Appeals for the Eleventh
Circuit Court overturned OSHA鈥檚 1989 Air Contaminants Rule, which included specific PELs for wood dust established by OSHA at
that time. Wood dust is now officially regulated as an organic dust in a category known as 鈥淧articulates Not Otherwise Regulated鈥?
(PNOR), or Nuisance Dust. However, a number of states have incorporated the OSHA PELs from the 1989 standard in their state
plans. Additionally, OSHA has announced that it may cite companies under the OSH Act general duty clause under appropriate
circumstances for noncompliance with the 1989 PELs.
B
The VOC content of adhesives and sealants used are equal or less than the current VOC content limits of South Coast Air Quality
Management District (SCAQMD) Rule #1168, AND all sealants used as fillers meet or exceed the requirements of the Bay Area Air
Quality Management District Regulation 8, Rule 51.
C
This product contains no urea-formaldehyde resins.
D
This ingredient is the polymerized form of MDI resin. There is no detectable MDI monomer in the product as purchased.
E
Wood preservative/fungicide. Registered with the U.S. EPA as a pesticide. (EPA registration number is 1624-120).
3. Hazard Identification
Appearance and Odor: TimberStrand庐 consists of layers of laminated solid wood which are glued
together with a polymerized diphenylmethane diisocyanate (polymeric MDI) resin. The product has a
slightly aromatic/wood odor. The wood component may consist of hardwoods, not including cedar.
This product also contains a biocide and insecticide to help prevent decomposition from mold and
insect infestation.
Primary Health Hazards: The primary health hazard posed by these products is thought to be due to
inhalation of wood dust.
Primary Route(s) of Exposure:
Ingestion:
鈱? Skin: Dust
鈱? Inhalation: Dust
鈱? Eyes: Dust
Medical Conditions Generally Aggravated by Exposure: Wood dust may aggravate pre-existing
respiratory conditions or allergies.
Signs and Symptoms of Exposure:
Acute Health Hazards: Wood dust can cause eye irritation. Certain species of wood dust can elicit
allergic contact dermatitis in sensitized individuals. Wood dust may cause respiratory irritation, nasal
dryness, coughing, sneezing, wheezing as a result of inhalation.
Chronic Health Hazards: Wood dust, depending on the species, may cause allergic contact dermatitis
and respiratory sensitization with prolonged, repetitive contact or exposure to elevated dust levels.
Prolonged exposure to wood dust has been reported by some observers to be associated with nasal
cancer.
Carcinogenicity Listing:
鈱? NTP: Wood dust, Known to be a Human Carcinogen
鈱? IARC Monographs: Wood dust, Group 1 鈭? Carcinogenic to humans. Polymeric MDI, Group 3 鈭?
Unclassifiable as to carcinogenicity to humans.
OSHA Regulated: Not Listed
NTP:
Wood Dust
According to its Tenth Report on Carcinogens, NTP states, 鈥淲ood dust is known to be a human
carcinogen based on sufficient evidence of carcinogenicity from studies in humans. An association
between wood dust exposure and cancer of the nose has been observed in many case reports,
cohort studies, and case-control studies that specifically addressed nasal cancer. Strong and
consistent associations with cancer of the nasal cavities and paranasal sinuses were observed both
in studies of people whose occupations are associated with wood dust exposure and in studies that
directly estimated wood dust exposure.鈥?
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3. Hazard Identification (cont鈥檇.)
IARC:
Wood Dust
Group 1 (Carcinogenic to humans; sufficient evidence of carcinogenicity). This classification is primarily
based on studies showing an association between occupational exposure to wood dust and
adenocarcinoma of the nasal cavities and paranasal sinuses. IARC did not find sufficient evidence of
an association between occupational exposure to wood dust and cancers of the oropharynx,
hypopharynx, lung, lymphatic and hematopoietic systems, stomach, colon or rectum.
4. Emergency and First-Aid Procedures
Ingestion: Not applicable under normal use.
Eye Contact: Wood dust may cause mechanical irritation. Treat dust in eye as foreign object. Flush
with water to remove dust particles. Seek medical help if irritation persists.
Skin Contact: Wood dust of certain species can elicit allergic contact dermatitis in sensitized individuals,
as well as mechanical irritation resulting in erythema and hives. Seek medical help if rash, irritation or
dermatitis persists.
Skin Absorption: Not known to occur under normal use.
Inhalation: Wood dust may cause unpleasant obstruction in the nasal passages, resulting in dryness of
nose, dry cough, sneezing and headaches. Zinc borate (which is adhered to the wood dust particles)
may irritate the upper respiratory tract (nasal passages and throat) if levels of zinc borate exceed 10.0
mg/m3. However, if airborne wood dust exposures are kept below the TLV of 5.0 mg/m3, no zinc
borate effects are expected. If effects are suspected, remove individual to fresh air. Seek medical
help if persistent irritation, severe coughing or breathing difficulty occurs.
Note to Physician: None
5. Fire and Explosion Data
Flash Point (Method Used): NAP
LFL = NAP UFL = NAP
Flammable Limits:
Extinguishing Media: Water spray, carbon dioxide, sand
Autoignition Temperature: Variable [typically 400-500oF (204-260oC)].
Special Firefighting Procedures: None
Unusual Fire and Explosion Hazards: Depending on moisture content and more importantly, particle
diameter, wood dust may explode in the presence of an ignition source. An airborne concentration of
40 grams (40,000 mg) of dust per cubic meter of air is often used as the LEL for wood dusts.
However, zinc borate, aside from having resistance to decay and insects, is also a fire retardant.
Therefore, the explosion and fire hazard may be substantially reduced.
NFPA Rating (Scale 0-4): (wood dust) Health = 1 Fire = 1 Reactivity = 0
6. Accidental Release Measures
Steps to be Taken In Case Material Is Released or Spilled: Not applicable for products in purchased
form. Wood dust generated from sawing, sanding, drilling, or routing of these products may be
vacuumed or shoveled for recovery or disposal. Avoid dusty conditions and provide good ventilation.
Use NIOSH-approved respirator and goggles where ventilation is not possible and the allowable
exposure limits may be exceeded.
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7. Handling and Storage
Precautions to be Taken In Handling and Storage: No special handling precautions are required for
products in purchased form. Avoid repeated or prolonged breathing of wood dust. Products with
100% MDI adhesive release no formaldehyde and have no measurable uncured isocyanate
monomer. Store in well-ventilated, cool, dry place, away from open flame.
8. Exposure Control Measures, Personal Protection
Personal Protective Equipment:
RESPIRATORY PROTECTION 鈥? Not applicable for products in purchased form. A NIOSH-approved
respirator is recommended when allowable exposure limits may be exceeded.
PROTECTIVE GLOVES 鈥? Not required. However, cloth, canvas, or leather gloves are recommended to
minimize potential mechanical irritation from handling product.
EYE PROTECTION 鈥? Not applicable for product in purchased form. Goggles or safety glasses are
recommended when machining these products.
OTHER PROTECTIVE CLOTHING OR EQUIPMENT 鈥? Not applicable for product in purchased form.
Outer garments may be desirable in extremely dusty areas.
WORK/HYGIENE PRACTICES 鈥? Follow good hygienic and housekeeping practices. Clean up areas
where wood dust settles to avoid excessive accumulation of this combustible material. Minimize
blowdown or other practices that generate high airborne-dust concentrations.
Ventilation:
LOCAL EXHAUST 鈥? Provide local exhaust as needed so that exposure limits are met.
MECHANICAL (GENERAL) 鈥? Provide general ventilation in processing and storage areas so that
exposure limits are met.
SPECIAL 鈥? None
OTHER 鈥? None
9. Physical/Chemical Properties
Physical Description: TimberStrand庐 consists of layers of laminated solid wood which are glued
together with a polymerized MDI resin. The product has a slightly aromatic/wood odor. The wood
component may consist of hardwoods, not including cedar. This product also contains a biocide and
insecticide to help prevent decomposition from mold and insect infestation.
NAP
Boiling Point (@ 760 mm Hg):
NAP
Evaporation Rate (Butyl Acetate = 1):
NAP
Freezing Point:
NAP
Melting Point:
NAP
Molecular Formula:
NAP
Molecular Weight:
NAP
Oil-water Distribution Coefficient:
NAP
Odor Threshold:
NAP
pH:
<0.1
Solubility in Water (% by weight):
Variable; depends on wood species and moisture
Specific Gravity (H2O = 1):
NAP
Vapor Density (air = 1; 1 atm):
NAP
Vapor Pressure (mm Hg):
NAP
Viscosity:
% Volatile by Volume [@ 70oF (21oC)]: 0
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10. Stability and Reactivity
鈱? Stable
Stability: Unstable
Conditions to Avoid: Avoid open flame. Product may ignite at temperatures in excess of 400oF
(204oC).
Incompatibility (Materials to Avoid): Avoid contact with oxidizing agents.
Hazardous Decomposition or By-Products: Thermal decomposition products include carbon
monoxide, carbon dioxide, aliphatic aldehydes, resin acids, terpenes, polycyclic aromatic
hydrocarbons, hydrogen chloride, ethyl sulfide, diethyl sulfide, and nitrogen oxides.
鈱? Will not occur
Hazardous Polymerization: May occur
Sensitivity to Mechanical Impact: NAP
Sensitivity to Static Discharge: NAP
11. Toxicological Information
Toxicity Data: None available for product in purchased form. Individual component information is listed
below if available.
Components:
Wood dust (softwood or hardwood)
OSHA Hazard Rating = 3.3; moderately toxic with probable oral lethal dose to humans being 0.5-5 g/kg
(about 1 pound for a 70 kg or 150 pound person). Wood dust 鈥? generated from sawing, sanding or
machining the product 鈥? may cause nasal dryness, irritation, coughing and sinusitis. NTP and IARC
classify wood dust as a human carcinogen (IARC Group 1). This classification is based primarily on
increased risk in the occurrence of adenocarcinomas of the nasal cavities and paranasal sinuses
associated with exposure to wood dust. The evaluation did not find sufficient evidence to associate
cancers of the oropharynx, hypopharynx, lung, lymphatic and hematopoietic systems, stomach, colon
or rectum with exposure to wood dust. Source: OSHA Regulated Hazardous Substances,
Government Institutes, Inc., February 1990.
Zinc borate hydrate
Acute Toxicity:
Ingestion 鈭? Low acute oral toxicity; LD50 in rats is greater than 10,000 mg/kg of body weight.
Skin/dermal 鈭? Low acute dermal toxicity; LD50 in rabbits is greater than 10,000 mg/kg of body weight.
Borogard庐 ZB is poorly absorbed through intact skin.
Inhalation 鈭? No experimental test data.
Skin irritation 鈭? Non-irritant.
Eye irritation 鈭? Draize test in rabbits produced mild eye irritation effects. Many years of occupational
exposure to Borogard庐 ZB indicates no adverse effects on human eyes. Therefore, Borogard庐 ZB is
not considered to be a human eye irritant in normal industrial use.
Sensitization 鈭? Borogard庐 ZB is not a skin sensitizer.
Note: Borogard庐 ZB (zinc borate) can decompose, under biological conditions, to form zinc hydroxide
and boric acid.
Reproductive/Developmental Toxicity: No experimental test data. However, animal feeding studies with
boric acid and sodium tetraborate in rat, mouse and dog, at high doses, have demonstrated effects
on fertility and testes. Studies with boric acid in the rat, mouse and rabbit, at high doses,
demonstrate developmental effects on the fetus, including fetal weight loss and minor skeletal
variations. The doses administered were many times in excess of those to which humans would
normally be exposed. Animal studies have also demonstrated developmental toxicity due to excess
zinc levels, including increased fetal resorption and reduced fetal weight. However, zinc is essential
for the normal fetal development.
Carcinogenicity/Mutagenicity: No experimental test data. Carcinogenicity and mutagenicity tests were
negative for boric acid. Limited epidemiology studies have shown no relationship between cancer in
humans and occupational exposure to zinc compounds.
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11. Toxicological Information (cont鈥檇.)
Human Data: A recent epidemiology study under the conditions of normal occupational exposure to
borate dusts indicated no effect on fertility. Source: U.S. Borax Inc. Material Safety Data Sheet for
Borogard庐 ZB, Revision Date: May 2000.
Target Organs: None for product in purchased form.
12. Ecological Information
Environmental Toxicity: None available for product in purchased form. Individual component
information is listed below if available.
Zinc borate hydrate
Boron is an essential micronutrient for healthy growth of plants; however, it can be harmful to boron-
sensitive plants in high quantities. Care should be taken to minimize the amount of Borogard庐 ZB
released to the environment.
Invertebrate Toxicity: Daphnids (Daphnia magna straus) 鈭? 48-hr LC50: 76 mg/L Borogard庐 ZB
Fish Toxicity: Freshwater rainbow trout (s. Gairdneri) 鈭? 96-hr LC50: 2.4 mg/L Borogard庐 ZB Bluegill
(lepomis macrochirus) 鈭? 96-hr LC50: >335 mg/L Borogard庐 ZB. Source: U.S. Borax Inc. Material
Safety Data Sheet for Borogard庐 ZB, Revision Date: May 2000
Environmental Fate: None available for product in purchased form. Individual component information is
listed below if available.
Zinc borate hydrate
Both boron and zinc occur naturally in seawater at average concentrations of 5 mg/L boron and 8
microgram/L zinc and at lower concentrations, generally, in fresh water. Borogard庐 ZB (zinc borate)
can decompose, under certain environmental conditions, to form sparingly water-soluble zinc
hydroxide and water-soluble boric acid.
Soil mobility: Zinc borate is sparingly soluble in water and may be leachable through normal soil.
Source: U.S. Borax Inc. Material Safety Data Sheet for Borogard庐 ZB, Revision Date: May 2000
13. Disposal Considerations
Waste Disposal Method: If disposed of or discarded in its purchased form, incineration is preferable.
Dry land disposal is acceptable in most states. It is, however, the user鈥檚 responsibility to determine at
the time of disposal whether your product meets RCRA criteria for hazardous waste. Follow
applicable federal, state, and local regulations.
14. Transport Information
Mode: (Air, Land, water)
DOT classification
Zinc borate is regulated as a hazardous material by the U.S. Department of Transportation (DOT) if
transported in quantities greater than 1000 pounds (454 kilograms) in one package. Since the
amount of zinc borate in the product does not exceed this quantity, the U.S. DOT does not consider
the product to be a hazardous material. Therefore, as shipped, this product is not regulated by the
U.S. Department of Transportation.
TDG classification
Zinc borate is regulated as a hazardous substance under Canadian Transportation of Dangerous Goods
(TDG) regulation. However, as shipped the amount of zinc borate in this product falls below the
regulated limit of 110 lbs. (50 kg), the product would not be considered a hazardous material.
NAP
Proper Shipping Name:
NAP
Hazard Class:
NAP
UN/NA ID Number:
NAP
Packing Group:
NAP
Information Reported for Product/Size:
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15. Regulatory Information
TSCA: The following ingredients are on the TSCA inventory:
Polymeric Diphenylmethane Diisocyanate (Polymeric MDI), CAS# 9016-87-9
Paraffin wax (CAS# 8002-74-2)
Soybean Oil (CAS# 8001-22-7, contained in Co-Binder ingredient)
CERCLA: NAP
DSL: The following ingredients are on the Canadian Domestic Substance List (DSL) inventory:
Polymeric Diphenylmethane Diisocyanate (Polymeric MDI), (CAS# 9016-87-9)
Paraffin wax (CAS# 8002-74-2)
Soybean Oil (CAS# 8001-22-7)
OSHA: Wood products are not hazardous under the criteria of the federal OSHA Hazard Communication
Standard 29 CFR 1910.1200. However, wood dust generated by sawing, sanding or machining this
product may be hazardous.
STATE RIGHT-TO-KNOW:
California Prop 65 鈥? Not listed.
New Jersey 鈥? Not listed.
Pennsylvania 鈥? When cut or otherwise machined, the product may emit wood dust. Wood dust, Paraffin
wax (CAS# 8002-74-2) and Soybean oil (CAS#8001-22-7) appear on Pennsylvania鈥檚 Appendix A 鈥?
Hazardous Substance Lists.
Minnesota 鈥? Minnesota Statutes, 1984, Section 144.495 and 325F.181 do not apply to this product as
Zinc Borate-treated TimberStrand庐 does not contain formaldehyde.
SARA 313 Information: To the best of our knowledge, this product contains no chemical subject to
SARA Title III Section 313 supplier notification requirements.
SARA 311/312 Hazard Category: This product has been reviewed according to the EPA 鈥淗azard
Categories鈥? promulgated under SARA Title III Sections 311 and 312 and is considered, under
applicable definitions, to meet the following categories:
An immediate (acute) health hazard: Yes
A delayed (chronic) health hazard Yes
A fire hazard No
A reactivity hazard No
A sudden release hazard No
FDA: NAP
WHMIS Classification: Not a controlled product
16. Additional Information
Date Prepared: 09/21/00
Date Revised: 10/10/2005
Prepared By: Weyerhaeuser Company, Corporate Environment, Health & Safety
Weyerhaeuser MSDS available on: http://www.weyerhaeuser.com/environment/msds/default.asp
User鈥檚 Responsibility: The information contained in this Material Safety Data Sheet is based on the
experience of occupational health and safety professionals and comes from sources believed to be
accurate or otherwise technically correct. It is the user鈥檚 responsibility to determine if the product is
suitable for its proposed application(s) and to follow necessary safety precautions. The user has the
responsibility to make sure that this MSDS is the most up-to-date issue.
Weyerhaeuser MSDS WC 315-09
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16. Additional Information (cont鈥檇.)
Definition of Common Terms:
ACGIH = American Conference of Governmental Industrial Hygienists
C = Ceiling Limit
CAS# = Chemical Abstracts System Number
DOT = U. S. Department of Transportation
DSL = Domestic Substance List
EC50 = Effective concentration that inhibits the endpoint to 50% of control population
EPA = U.S. Environmental Protection Agency
IARC = International Agency for Research on Cancer
IATA = International Air Transport Association
IMDG = International Maritime Dangerous Goods
LC50 = Concentration in air resulting in death to 50% of experimental animals
LCLo = Lowest concentration in air resulting in death
LD50 = Administered dose resulting in death to 50% of experimental animals
LDLo = Lowest dose resulting in death
LEL = Lower Explosive Limit
LFL = Lower Flammable Limit
MSHA = Mine Safety and Health Administration
NAP = Not Applicable
NAV = Not Available
NIOSH = National Institute for Occupational Safety and Health
NPRI = Canadian National Pollution Release Inventory
NTP = National Toxicology Program
OSHA = Occupational Safety and Health Administration
PEL = Permissible Exposure Limit
RCRA = Resource Conservation and Recovery Act
STEL = Short-Term Exposure Limit (15 minutes)
STP = Standard Temperature and Pressure
TCLo = Lowest concentration in air resulting in a toxic effect
TDG = Canadian Transportation of Dangerous Goods
TDLo = Lowest dose resulting in a toxic effect
TLV = Threshold Limit Value
TSCA = Toxic Substance Control Act
TWA = Time-Weighted Average (8 hours)
UFL = Upper Flammable Limit
WHMIS = Workplace Hazardous Materials Information System
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