ASTM D7032 Standard Specification for Establishing Performance Ratings for Wood-Plastic Composite and Plastic Lumber Deck Boards, Stair Treads, Guards, and Handrails

Get Certified ASTM D7032 Testing for Reliable Wood-Plastic Composite Performance Evaluation 

ASTM D7032 sets performance ratings for WPC and plastic lumber deck boards, stair treads, guards, and handrails. Skilled technicians prepare representative products and specimens for structural, environmental, and performance evaluations. The properties considered include flexural properties, temperature effects, moisture effects, UV resistance, freeze-thaw resistance, and other suitable properties. Controlled testing provides documented performance data for product evaluation and code recognition.

It addresses products made using different fiber and/or resin formulations and recognizes that their structural, physical, fire, and other characteristics may differ from conventional wood because of their plastic and other non-wood components.

The scope of ASTM D7032 includes:

• Material: Wood-plastic composite and plastic lumber products with a plastic component consisting primarily of thermoplastics. 
• Objective: Establish performance ratings for exterior deck boards, stair treads, guards, and handrails for use in applications where combustible construction is allowed. 
• Property measurement: Flexural performance, temperature and moisture effects, UV resistance, freeze-thaw resistance, biodeterioration, fire performance, creep-recovery, allowable load, fastener holding, slip resistance, and guard or handrail load performance, as applicable. 
• Method: A set of referenced test procedures and performance evaluations are applied depending on the product type and applicable requirements. 
• Result: Performance data are used to establish ratings for deck boards and stair treads or demonstrate applicable performance of guards and handrails. 
• Test limitations: Manufacturing-process details are beyond the scope of the specification, and the standard does not assume that WPC or plastic lumber will behave in the same manner as wood. 
• Environmental conditions: Products are tested for the effects of temperature, moisture, UV exposure, freeze-thaw cycles, biodeterioration, and fire performance. 
• Applications: Exterior deck boards, stair treads, guards, handrails, product qualification, performance rating, and code-recognition activities.

What are the uses of ASTM D7032 testing? 

ASTM D7032 provides a method for laboratories and manufacturers to develop specific performance ratings for WPC and plastic lumber products designed for exterior structural or safety use with documentation. The specification provides different performance evaluations according to whether the product is a deck board, stair tread, guard, or handrail. This standard-

• Helps establish performance ratings for WPC and plastic lumber deck boards. Supports evaluation of deck boards used as stair treads. 
• Provides procedures for evaluating guards and handrails. 
• Supports flexural performance testing under applicable conditions. 
• Evaluates the effects of temperature and moisture on product performance. 
• Supports assessment of UV and freeze-thaw resistance. 
• Provides additional deck-board evaluations for creep recovery, allowable load, fastener holding, and slip resistance. 
• Supports evaluations of applicable products for guards and handrails using concentrated-load and guardrail system testing.

Which Materials Can Be Tested Under ASTM D7032? 

ASTM D7032 covers wood-plastic composite and plastic lumber for exterior use as deck boards, stair treads, guards, and handrails. The plastic component of the covered WPC and plastic lumber products consists primarily of thermoplastics. Products may have different fiber and/or resin formulations and may be solid or non-solid, provided their shape and thickness comply with applicable code requirements.

Why is ASTM D7032 important? 

Performance evaluation is a consistent way to describe WPC and plastic lumber products for exterior applications. These materials can contain different proportions and types of plastic, fiber, resin, or other components, so their structural and physical behavior may differ from conventional wood. ASTM D7032 provides defined performance evaluations that can be used to establish product ratings and support code recognition.

ASTM D7032 Testing Process and Data Collection 

During ASTM D7032 testing, technicians document the product identification, specimen configuration, sample size, conditioning history, selected performance evaluations, equipment, and relevant test conditions. Analysts record measurements such as applied load, displacement, flexural response, allowable load, creep or recovery, fastener-holding performance, slip resistance, and other applicable results. Personnel record the relevant exposure conditions and specimen response after exposure to temperature and moisture, UV exposure, freeze-thaw, biodeterioration testing, or fire-performance testing for environmental evaluations. The laboratory measures the response and records the applicable loading arrangement for the guards and handrails.

Common Challenges and Troubleshooting 

ASTM D7032 test results may vary because of different specimen preparation, product configuration, conditioning, loading fixtures, environmental exposure, or measurement equipment. Measured performance can vary due to differences in temperature and exposure to moisture, UV conditioning, freeze-thaw cycles, specimen size, supports, loading rates, and more. Technicians should select representative specimens, verify dimensions and configuration, maintain the specified conditioning conditions, calibrate load and displacement equipment, and follow the applicable performance procedure carefully. Analysts should also document any specimen damage, unusual deformation, cracking, failure mode, or other observations that could affect interpretation of the results.

• Laboratories report load, deflection, dimensions, deformation, slip resistance, fastener-holding results, and other measurements using the applicable ASTM units and procedures. 
• Technicians record the relevant structural and environmental performance results for the product, including flexural response, allowable load, creep-recovery, or guard and handrail load performance where applicable. 
• Analysts document the product type, specimen configuration, conditioning history, test setup, exposure conditions, failure characteristics, and other relevant observations. 
• Engineers and analysts compare the measured results with the applicable ASTM D7032 performance requirements and use the documented results to establish the applicable performance rating.

Link to ASTM D7032