Material Safety Data Sheet
Treated TimberStrand铮? LSL
Weyerhaeuser Company Emergency Phone: (253) 924-5000
PO Box 9777 Additional Information: (253) 924-3865
Federal Way, WA 98063-9777
1. Product Identification
Product Manufacturing Location
TimberStrand餂? LSL Deerwood, MN; Chavies, KY
Synonyms: None
2. Hazardous Ingredients/Identity Information
Name CAS# Percent Agency Exposure Comments
Limits
3
Wood None 93鈥?95 OSHA PEL-TWA 15 mg/m Total dust
3
OSHA PEL-TWA 5 mg/m Respirable dust fraction
3
ACGIH TLV-TWA 5 mg/m Softwood total dust
3
ACGIH TLV-STEL 10 mg/m Softwood total dust
3
ACGIH TLV-TWA 1 mg/m Selected hardwood total
dust (beech, oak, others)
3
1
PEL-TWA 5 mg/m Softwood or hardwood total
Recommended
dust
3
1
PEL-STEL 10 mg/m Softwood or hardwood total
Recommended
dust
3
1
PEL-TWA 2.5 mg/m Western red cedar total dust
Recommended
Resin Solids:
Polymeric 9016-87-9 4鈥?6 OSHA None None
diphenyl- ACGIH None
methane
2
diisocyanate
Biocide:
3
Zinc borate 138265-88-0 <1 OSHA PEL-TWA 15 mg/m Total dust
3 3
hydrate PEL-TWA 5 mg/m Respirable dust fraction
3
ACGIH TLV-TWA 10 mg/m Inhalable dust fraction
3
TLV-TWA 5 mg/m Respirable dust fraction
3
Paraffin wax 8002-74-2 <1 OSHA PEL-TWA 2 mg/m Paraffin wax fume
3
ACGIH TLV-TWA 2 mg/m Paraffin wax fume
1 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.
2 This ingredient is the polymerized form of MDI resin. There is no detectable MDI monomer in the product as purchased.
3 Wood preservative/fungicide. Registered with the U.S. EPA as a pesticide. (EPA registration number is 1624-120).
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3. Hazard Identification
Appearance and Odor: TimberStrand餂? LSL consists of layers of laminated solid wood glued
together with a polymerized MDI resin. The product has a slightly aromatic/wood odor. The wood
component may consist of aspen, birch, maple and/or sycamore. 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 and dermal exposure to wood dust.
Primary Route(s) of Exposure:
( ) Ingestion:
(x) Skin: Dust
(x) Inhalation: Dust
Medical Conditions Generally Aggravated by Exposure: Wood dust may aggravate
preexisting respiratory conditions or allergies.
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: Not listed
(X) IARC Monographs: Wood dust, Group 1
( ) OSHA Regulated: Not listed
IARC 鈥? 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: In sensitized individuals, wood dust of certain species can elicit allergic contact
dermatitis and mechanical irritation resulting in erythema and hives. Insecticide used in the
product may cause a tingling, itching, burning or prickly sensation. However, the quantities
contained in the board (0.003% by weight of the product) should not create undue risk beyond
that which would be imparted by the wood itself. Get 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. Get medical help if persistent irritation, severe coughing or breathing difficulty occurs.
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5. Fire and Explosion Data
Flash Point (Method Used): NAP
Flammable Limits:
LEL: See below under 鈥淯nusual Fire and Explosion Hazards鈥?
UEL: NAP
Extinguishing Media: Water, carbon dioxide, sand.
Autoignition Temperature: Variable [typically 400鈥?500o F (204鈥?260o 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 dust
concentration of 40 g/m3 (40,000 mg/m3) 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.
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/MSHA-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.
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 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 and 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.
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9. Physical/Chemical Properties
Boiling point (@ 760 mmHg): NAP
Vapor pressure (mmHg): NAP
Vapor density (air = 1; 1 atm): NAP
Specific gravity (H2O = 1): Variable; depends on wood species and moisture
Melting point: NAP
Evaporation rate (butyl acetate = 1): NAP
Solubility in water (% by weight): <0.1
% volatile by volume [@ 70o F (21o C)]: 0
pH: NAP
Oil-water distribution coefficient: NAP
Odor threshold: ND
10. Stability and Reactivity
Stability: ( ) Unstable (x) Stable
Conditions to Avoid: Avoid open flame. Product may ignite at temperatures over 400o F (204o 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, hydrogen chloride, ethyl sulfide, diethyl sulfide and nitrogen oxides.
Hazardous Polymerization: ( ) May occur (x) Will not occur
Sensitivity to Mechanical Impact: NAP
Sensitivity to Static Discharge: NAP
11. Toxicological Information
None available for product in purchased form. Individual component information is listed below if
available.
Wood dust (softwood or hardwood) OSHA Hazard Rating = 3.3; moderately toxic with probable
oral lethal dose to humans being 0.5鈥?5 g/kg (about 0.08鈥?1 pound for a 70 kg or 150 pound
person).
Zinc Borate
LD50 (Rat Oral) = > 10,000 mg/kg (Slightly toxic)
LD50 (Rabbit Dermal) = > 10,000 mg/kg (Slightly toxic)
Sources: OSHA Regulated Hazardous Substances, Government Institutes, Inc., February 1990;
US Borax Inc.
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12. Ecological Information
None available for product in purchased form. Individual component information is listed below if
available.
Zinc Borate
Invertebrate Toxicity
Daphnids, Daphnia magna (Straus)
48 hr. LC50 = 76 mg/L
Fish Toxicity
Rainbow Trout, Salmo gairdneri
96 hr. LC50 = 2.4 mg/L
Bluegill, Lepomis macrochirus
96 hr. LC50 > 335 mg/L
Persistence/degradation
Zinc borate is slightly soluble in water and slowly hydrolyzes to form zinc
hydroxide and boric acid.
Soil Mobility
Zinc borate is slightly soluble in water and may be leachable in the soil.
Source: Registry of Toxic Effects of Chemical Substances (RTECS), National Institute of
Occupational Safety and Health (provided by the Canadian Centre for Occupational Health and
Safety, CCINFO November 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
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. Because the amount of zinc borate in the product does not exceed this quantity,
the U.S. DOT does not consider zinc borate to be a hazardous material.
As shipped, this product is not regulated by the U.S. DOT.
TDG classification: Zinc borate is regulated as a hazardous substance under the 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. (50kg) and would therefore not be
considered a hazardous material.
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15. Regulatory Information
TSCA
The following ingredients are on the TSCA inventory.
Chemicals listed:
Polymeric diphenylmethane diisocyanate CAS# 9016-87-9
Zinc borate CAS# 1332-07-6. Listed as the anhydrous form of the inorganic salt.
The form used in this product is the hydrated form (2ZnO-3B2O3-3.5H2O), CAS#
138265-88-0.
DSL
The following ingredients are on the Canadian Domestic Substance List (DSL) inventory.
Chemicals listed:
Polymeric diphenylmethane diisocyanate CAS# 9016-87-9
Zinc borate CAS# 1332-07-6. Listed as the anhydrous form of the inorganic salt.
The form used in this product is the hydrated form, CAS# 138265-88-0.
WHMIS Classification
Not a controlled product
STATE RIGHT-TO-KNOW
鈥? California Prop 65 鈥? Not listed
鈥? New Jersey 鈥? Not listed
鈥? Pennsylvania 鈥? When cut or otherwise machined, the product may emit wood dust, a
listed substance in Pennsylvania.
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:
鈥? An immediate (acute) health hazard 鈥? yes
鈥? A delayed (chronic) health hazard 鈥? yes
鈥? A fire hazard 鈥? no
鈥? A reactivity hazard 鈥? no
鈥? A sudden release hazard 鈥? no
16. Additional Information
Date Prepared: 11/21/00
Date Revised: 07/23/01
Prepared By: Environment, Health and Safety
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 whether
this information is suitable for their applications and to follow safety precautions as necessary.
The user has the responsibility to make sure that this sheet is the most up-to-date issue.
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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 Service Registry Number
DSL Canadian Domestic Substance List
EPA U.S. Environmental Protection Agency
IARC International Agency for Research on Cancer
LCLo Lowest concentration in air resulting in death
LC50 Concentration in air resulting in death to 50% of experimental animals
LDLo Lowest dose resulting in death
LD50 Administered dose resulting in death to 50% of experimental animals
LSL Laminated Strand Lumber
MSHA Mining Safety and Health Administration
ND Not Determined
NAP Not Applicable
NAV Not Available
NIOSH National Institute for Occupational Safety and Health
NTP National Toxicology Program
OSHA Occupational Safety and Health Administration
PEL Permissible Exposure Limit
STEL Short-Term Exposure Limit (15 minutes)
TDG Canadian Transportation of Dangerous Goods
TCLo Lowest concentration in air resulting in a toxic effect
TDLo Lowest dose resulting in a toxic effect
TLV Threshold Limit Value
TWA Time-Weighted Average (8 hours)
WHMIS Workplace Hazardous Materials Information System
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