1. Scope

1.1 This specification covers adhesives suitable for the bonding of wood, including treated wood, into structural wood products for general construction or other uses where a high-strength, durable adhesive bond is required.

1.2 This specification includes test methods that may be referenced by specific product standards for the evaluation and approval of structural wood adhesives. Methods are included to evaluate adhesives intended for use in exterior exposure, which are characterized and defined by two distinct service classes as described in 1.3.

Note 1Consult the Commentary in Appendix X1 regarding the intent and limitations of each test method contained in this specification.

1.3 Description of Bondline Performance It is recognized that structural wood adhesives are used in various applications and under various levels of severity in terms of moisture content, loading, cyclic and seasonal weather conditions, heat exposure and other use conditions. It is the intent of this standard to determine the suitability of an adhesive for use under various levels of severity and conditions of use in accordance with specific and appropriate test methods and requirements. For use in this standard, structural wood adhesives are separated into two classes described in terms of conditions of use, and severity of environmental exposure including the amount of moisture.

Note 2This standard does not contain specific tests outlined for different chemical types of adhesives.

1.3.1 Description of Adhesive Service Class A This service class is characterized by its limited exposure to the weather, including low moisture content conditions and is sometimes referred to as a Protected Service or Limited Moisture Exposure environment. In this service class, exposure of adhesive bondlines in structural wood products to exterior environment is limited to those such as during transportation, construction and accidental exposure where the material may be subjected to a limited number of cycles of short-term wetting and drying.

1.3.2 Description of Adhesive Service Class B This service class is described wherein adhesive bondlines in structural wood products are subjected to full and repeated or continuous exposure to the weather including high moisture content conditions. This exposure may include fresh and saltwater marine applications as well as possible ground contact. This service class has traditionally been refereed to as Exterior or Wet Service.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D9 Terminology Relating to Wood and Wood-Based Products

D143 Test Methods for Small Clear Specimens of Timber

D905 Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading

D907 Terminology of Adhesives

D1165 Nomenclature of Commercial Hardwoods and Softwoods

D1583 Test Method for Hydrogen Ion Concentration of Dry Adhesive Films

D2555 Practice for Establishing Clear Wood Strength Values

D3535 Test Method for Resistance to Creep Under Static Loading for Structural Wood Laminating Adhesives Used Under Exterior Exposure Conditions

D4300 Test Methods for Ability of Adhesive Films to Support or Resist the Growth of Fungi

D4442 Test Methods for Direct Moisture Content Measurement of Wood and Wood-Base Materials

D5055 Specification for Establishing and Monitoring Structural Capacities of Prefabricated Wood I-Joists

D5266 Practice for Estimating the Percentage of Wood Failure in Adhesive Bonded Joints

D5456 Specification for Evaluation of Structural Composite Lumber Products

E6 Terminology Relating to Methods of Mechanical Testing

E41 Terminology Relating To Conditioning

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

Keywords

adhesive; delamination; durability; exterior exposure; glulam; laminated wood; shear strength; structural-glued-laminated timber;

ICS Code

ICS Number Code 79.060.10 (Plywood)

DOI: 10.1520/D2559-10A

ASTM International is a member of CrossRef.