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D3498-19 – Standard Test Method Technical Guide
📐 Scope and Definitions
ASTM D3498-19 establishes minimum performance standards and test requirements for gap-filling construction adhesives used in bonding wood structural panels, including plywood and oriented strand board (OSB), to wood-based floor system framing. This specification applies primarily to dimension lumber or wood I-joists at construction sites. It is intended to ensure adhesive quality rather than serve as an application specification.
| 📏 Term | 📖 Definition |
|---|---|
| Gap Class | Classification based on a 1/8 in. (1.59 mm) gap condition for qualification. |
| Gap-Filling Adhesive | An adhesive capable of forming and maintaining a bond between surfaces that are not close-fitting. |
| Open Assembly Time | The time interval between applying adhesive on the substrates and closing them together before bonding. |
⚙️ Performance Criteria and Referenced Standards
This specification references several ASTM standards to define test methods for evaluating adhesive performance. Key referenced standards include D905 for shear strength, D4300 for fungal resistance, and D4783 for microbial attack resistance. Compliance with these standards ensures the adhesive meets the required durability and strength characteristics.
| 🟦 Standard | 📋 Purpose |
|---|---|
| D905 | Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading |
| D4300 | Test Methods for Ability of Adhesive Films to Support or Resist the Growth of Fungi |
| D4783 | Test Methods for Resistance of Adhesive Preparations in Container to Attack by Bacteria, Yeast, and Fungi |
| D572 | Test Method for Rubber—Deterioration by Heat and Oxygen |
Note: All values in this specification are stated in inch-pound units, which are regarded as standard. SI equivalents are provided for information only.
Caution: This standard does not address all safety concerns. Users should establish appropriate safety, health, and environmental practices before use.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D3498-19?
This specification covers performance standards for gap-filling adhesives used to bond plywood or OSB to wood-based floor framing at construction sites.
💡 How is “gap class” defined in this standard?
Gap class is a classification based on whether the product has been qualified using a 1/8 in. (1.59 mm) gap condition.
⚡ What are some key referenced standards?
Referenced standards include D905 for shear strength, D4300 for fungal resistance, and D4783 for microbial resistance.
📌 What is a gap-filling adhesive?
It is an adhesive capable of bonding surfaces that are not close-fitting, either by bridging or completely filling the gap.