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D2017-05 – Standard Test Method Technical Guide
🧪 Purpose and Scope of the Test Method
The ASTM D2017-05 standard covers the evaluation of natural decay resistance of wood and wood products. As per Section 1, this test method is applicable for assessing resistance to wood-destroying fungi. It serves as a qualitative means to estimate microbial attack resistance, helping to qualify the performance level of different wood species as highlighted in Section 3.
⚗️ Test Setup and Environmental Conditions
The test involves exposing wood blocks in decay chambers to pure fungal cultures grown on feeder strips or filter paper. The apparatus required includes conditioning chambers and incubation rooms with strict environmental controls. According to Section 5, conditioning chambers must maintain a temperature between 20 and 30°C (±1°C) and relative humidity between 25 and 75% (±2%). Incubation rooms require 25–27°C (±1°C) temperature and 65–75% (±2%) relative humidity. Culture bottles of 225 mL or 450 mL with specific lid configurations are used to contain the test samples.
| 🟦 Parameter | 🌡️ Conditioning Chamber | 🌡️ Incubation Room |
|---|---|---|
| Temperature Range | 20–30°C (±1°C) | 25–27°C (±1°C) |
| Relative Humidity | 25–75% (±2%) | 65–75% (±2%) |
📈 Key Evaluation Criteria and Measurement
The decay resistance is determined by weighing test blocks before and after exposure using a balance sensitive to 0.01 g. The test is terminated when nondurable wood reference blocks exhibit a weight loss of 50% or greater, or after a maximum of 16 weeks as stated in Section 4. This measure of weight loss indicates the susceptibility or resistance of the wood to fungal decay. Additional reference standards include ASTM D1413 for soil-block cultures and ASTM D3507 for preservative penetration.
💡 Technical Tip: Using autoclavable filters with 0.2-micron pore size in culture bottle lids can effectively reduce mite infestation during prolonged tests, as noted in the alternate lid specification.
⚠️ Safety Note: Users should establish appropriate safety and health practices and determine regulatory limitations due to potential hazards from fungal cultures and environmental controls.
❓ Frequently Asked Questions
🔍 What types of materials can be tested with this method? The test is designed for wood and wood products, but can also evaluate other organic materials susceptible to fungal decay as per Section 1.
💡 How are the test blocks prepared for exposure? Small blocks representing the timber species are weighed and placed in decay chambers with pure fungal cultures on feeder strips or filter paper, as summarized in Section 4.
⚡ When should the test be terminated? The test ends when reference blocks show 50% weight loss or after 16 weeks, whichever occurs first, per Section 4.
📌 What equipment is essential for this test? Key equipment includes conditioning and incubation chambers, a balance with 0.01 g sensitivity, screening trays, and culture bottles of specified sizes with appropriate lids.