Material Safety Data Sheet
TimberStrand LSL, TJO Joist, iLevel Shear Brace
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/Sustainability/MSDS Revised Date: May 21, 2008
1. Product Identification
Product Manufacturing Location(s)
USA: Chavies, KY; Deerwood, MN
TimberStrand庐 LSL, TJO庐, iLevel鈩? Shear Brace
Canada: Kenora, ON
2. Hazardous Ingredients/Identity Information
Name CAS# Percent Agency Exposure Limits Comments
Wood None 93-95 OSHA PEL-TWA 15 mg/m3 Total dust
(see footnote A below
OSHA PEL-TWA 5 mg/m3 Respirable dust
(see footnote A below) fraction
TLV-TWA 0.5 mg/m3
ACGIH Inhalable, Western
red cedar
TLV-TWA 1 mg/m3
ACGIH Softwood or
hardwood total dust
Resin Solids: B, C 9016-87-9 4-6 OSHA None
Polymeric ACGIH None
Diphenylmethane
Diisocyanate D
(Polymeric MDI)
Co-Binder B None 0-2 None None
Paraffin wax B PEL-TWA 2 mg/m3
8002-74-2 <1 OSHA Paraffin wax fume
TLV-TWA 2 mg/m3
ACGIH Paraffin wax fume
A In AFL-CIO v OSHA, 965 F. 2d 962 (11th Cir. 1992), the Court overturned OSHA鈥檚 1989 Air Contaminants Rule, including the specific PEL鈥檚 for wood dust that
OSHA had established at that time. The 1989 vacated PEL鈥檚 were: 5 mg/m3 STEL (15 min)-10mg/m3 PEL-TWA (all softwood and hardwood except Western Red
Cedar) - Western Red Cedar; TWA 2.5 mg/m3. Wood dust is now regulated by OSHA as 鈥淧articulates Not Otherwise Regulated鈥? (PNOR), or Nuisance Dust.
However, some states have incorporated the 1989 OSHA PEL's in their state plans. Additionally, OSHA indicated that it may cite employers under the OSH Act
general duty clause in appropriate circumstances for noncompliance with the 1989 PEL's.
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.
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3. Hazard Identification
Appearance and Odor: TimberStrand庐 consists of layers of laminated solid wood which are glued
together with a polymerized methylene bisphenyl diisocyanate (MDI) resin. The product has a slightly
aromatic/wood odor. The wood component may consist of hardwoods, not including cedar.
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:
Skin: Dust
Inhalation: Dust
Eye: Dust
Medical Conditions Generally Aggravated by Exposure:
Signs and Symptoms of Exposure: Wood dust may aggravate pre-existing respiratory conditions
or allergies.
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, and 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:
NTP: Wood dust, Known to be a Human Carcinogen
Wood dust, Group 1 鈭? Carcinogenic to humans. Polymeric MDI,
IARC Monographs:
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?
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. Get 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. Get medical help if rash, irritation or
dermatitis persists.
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4. Emergency and First-Aid Procedures (cont鈥檇.)
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. Remove 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, carbon dioxide, sand
Autoignition Temperature: Variable [typically 400掳-500掳F (204掳-260掳C)].
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.
Health = 1 Fire = 1 Physical Hazard = 0
HMIS Rating (Scale 0-4):
Health = 1 Fire = 1 Reactivity = 0
NFPA Rating (Scale 0-4):
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.
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. Product with
100% MDI adhesive, releases no formaldehyde. 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 product in purchased form. A NIOSH-approved
filtering facepiece respirator (鈥渄ust mask鈥?) is recommended when exposure limits may be exceeded.
EYE PROTECTION 鈥? Not applicable for product in purchased form. Goggles or safety glasses are
recommended when machining these products.
PROTECTIVE GLOVES 鈥? Not required. However, cloth, canvas, or leather gloves are recommended to
minimize potential mechanical irritation from handling product.
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.
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8. Exposure Control Measures, Personal Protection (cont鈥檇.)
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.
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:
0
% Volatile by Volume [@ 70掳F (21掳C)]:
10. Stability and Reactivity
Stability: Unstable Stable
Conditions to Avoid: Avoid open flame. Product may ignite at temperatures in excess of 400潞F
(204潞C).
Incompatibility (Materials to Avoid): Avoid contact with oxidizing agents.
Hazardous Decomposition or By-Products: Thermal decomposition products include carbon
monoxide, carbon dioxide, aliphatic aldehydes, rosin acids, terpenes, polycyclic aromatic
hydrocarbons.
Hazardous Polymerization: May occur Will not 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 generated from sawing, sanding or machining the product 鈥? may cause nasal dryness, irritation,
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11. Toxicological Information (cont鈥檇.)
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.
Target Organs: Wood dust- eyes, skin, respiratory system.
12. Ecological Information
Environmental Fate: No information available at this time.
Environmental Toxicity: No information available at this time.
13. Disposal Considerations
Waste Disposal Method: If disposed of or discarded in its purchased form, incineration is preferable.
Landfill 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) Not regulated as a hazardous material by the U.S. Department of
Transportation. Not listed as a hazardous material in Canadian Transportation of Dangerous Goods
(TDG) regulations.
NAP
Proper Shipping Name:
NAP
Hazard Class:
NAP
UN/NA ID Number:
NAP
Packing Group:
NAP
Information Reported for Product/Size:
15. Regulatory Information
TSCA: The following ingredients are on the TSCA inventory:
Polymeric Diphenylmethane Diisocyanate; paraffin wax; soybean oil (CAS# 8001-22-7) - (contained
in co-binder ingredient).
CERCLA: Not listed.
DSL: The following ingredients are on the Canadian Domestic Substance List inventory: Polymeric
Diphenylmethane Diisocyanate; soybean oil; paraffin wax.
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: This product does not contain substances identified on the
Proposition 65 list at levels that pose a significant risk for purposes of Section 25249.10(c) or result in
an observable effect for purposes of Section 25249.10(c) of the Act.
New Jersey 鈥? Not listed.
Pennsylvania 鈥? When cut or otherwise machined, this product may emit wood dust. Wood dust, paraffin
wax and soybean oil appear on Pennsylvania鈥檚 Appendix A 鈥? Hazardous Substance Lists.
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Regulatory Information (cont鈥檇.)
Minnesota 鈥? Minnesota Statutes, 1984, Section 144.495 and 325F.181 do not apply to this product as
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 "Hazard
Categories" 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 corrosive hazard No
A fire hazard No
A reactivity hazard No
A sudden release hazard No
FDA: Not intended for use as a food additive or food contact item.
WHMIS Classification: D2A (wood dust: IARC Group 1), Polymeric MDI; D1A-very toxic (classification
applies to aerosol only)
16. Additional Information
Date Prepared: 10/10/2005
Date Revised: 05/21/2008
Prepared By: Weyerhaeuser Company Corporate Environment, Health & Safety
Weyerhaeuser MSDS available on: http://www.weyerhaeuser.com/Sustainability/MSDS
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.
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
HMIS = Hazardous Materials Identification System
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
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16. Additional Information (cont鈥檇.)
NIOSH = National Institute for Occupational Safety and Health
NFPA = National Fire Protection Association
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
SARA = Species at Risk 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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