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D585-97 – Standard Test Method Technical Guide
📐 Scope and Core Purpose of Practice D585
ASTM D585 – 97 (Reapproved 2007) provides a standardized procedure for obtaining a representative sample from a single lot of paper, paperboard, fiberboard, or related converted products. This practice ensures that laboratory test results accurately reflect the overall quality of the shipment. A critical requirement is that the buyer and seller must agree upon the lot size, test methods, and sampling details prior to the purchase (Section 1.2). The standard also directs users to Appendix X1 and X2 for statistical criteria regarding the acceptance of lots based on the number of defective test units found.
🟢 Key Technical Note: The standard is approved for use by Department of Defense agencies, making it a required reference for military paper procurement. By preventing disputes through mandated pre-shipment agreements on sampling protocols, D585 acts as the foundational quality assurance bridge between production and testing.
⚙️ Establishing the Lot and Sampling Location
A precise definition of the “lot” is fundamental to this practice. Section 5.1 strictly warns against grouping together batches that differ significantly in raw materials or manufacturing conditions. If a shipment is composed of diverse batches, it must be divided into “sublots,” each internally consistent. Before taking any sample, the agent must fully understand the composition and size of the units, whether they are rolls, skids, or reams.
| 🟦 Criteria | 📏 Requirement per D585 | 🎯 Action Required |
|---|---|---|
| Raw Materials | Must be similar within a lot (5.1) | Do not mix paper from different fiber sources or furnishes. |
| Manufacturing | Must be consistent (5.1) | Divide continuous runs into sublots if process shifts occur. |
| Numerical Size | Agreed upon pre-purchase (1.2) | Define the specific number of rolls or skids in the contract. |
| Sampling Point | Mill or receiving dock (5.2.1) | If mill sampling is chosen, the sample is delivered to buyer for testing. |
📊 Referenced Standards and Statistical Acceptance
D585 does not exist in isolation. It anchors its acceptance criteria in rigorous statistical frameworks and auxiliary test methods. Specific references to MIL-STD-105D (inspection by attributes) and MIL-STD-414 (inspection by variables) allow for a robust quantitative assessment of quality. The practice also relies on ISO 186 for international alignment and ASTM D1968 for precise terminology, while test methods D528 and D5039 serve specific measurement needs.
| 📐 Standard | ⚡ Function in D585 Context |
|---|---|
| MIL-STD-105D | Provides sampling plans for inspection by attributes (classifying units as defective/passing). |
| MIL-STD-414 | Provides sampling plans for inspection by variables (measuring actual values like thickness). |
| ISO 186 | International parallel standard for sampling paper and board. |
| D1968 | Standard terminology relating to paper and paper products. |
⚠️ Practical Wisdom: A common source of dispute is sublot contamination. Even if a high overall average is met, mixing good rolls with out-of-spec rolls hides variability. Enforcing the strict “similar manufacture” rule in Section 5.1 at the receiving dock is the only way to ensure the integrity of the acceptance decision.
❓ Frequently Asked Questions
🔍 What constitutes a “lot” under this standard?
A lot must be a quantity of paper of similar type and grade, manufactured under essentially identical conditions. The standard explicitly forbids grouping batches that might differ significantly in raw materials or manufacture (Section 5.1).
💡 Can sampling be performed at the paper mill instead of the destination?
Yes. Section 5.2.1 explicitly permits this practice if it is agreed upon in the purchase contract. In this scenario, the sample taken at the mill is physically delivered to the purchaser for examination and testing.
⚡ What is the difference between MIL-STD-105D and MIL-STD-414 for this practice?
MIL-STD-105D deals with attributes (pass/fail criteria on a specification). MIL-STD-414 deals with variables (using the actual measured value of a property, such as basis weight, to estimate the percentage defective). The choice depends on the nature of the property being controlled.
📌 What happens if the lot size was not defined before purchase?
The standard explicitly states (Section 1.2) that agreement on lot size must happen “Prior to purchase.” Failing to do so voids the fundamental basis of the practice, making it difficult to establish a valid statistical sample and accept or reject the paper without further negotiation.