Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D5140-95 – Standard Test Method Technical Guide
📐 Specimen Preparation and Geometry
Per ASTM D5140-95, test samples representing polyurethane “poured in place” thermal break materials are prepared in an aluminum mold strictly in accordance with the manufacturer’s recommended procedures. The standard guide specifies a recommended mold size of 305 mm by 152 mm to create a standard-size test sample suitable for the subsequent physical and thermal property determinations.
The scope of this guide specifically covers the preparation and basic testing of solid thermal break materials (as opposed to cellular or combined assemblies, although the terminology covers these). Values are stated in SI units as the standard. Note that there is no similar or equivalent ISO standard available for this guide.
📊 Referenced Physical and Thermal Property Evaluation
The guide outlines a comprehensive suite of basic tests by referencing specific ASTM standard test methods. These tests are designed to evaluate the key properties required for thermal break performance, quality control in manufacturing, and specification writing. The tests are fundamental for qualifying a poured-in-place polyurethane system for use as a structural thermal barrier in fenestration and building envelope applications.
| 🟦 Property Evaluated | 📏 Referenced ASTM Standard | 🎯 Key Application |
|---|---|---|
| Steady-State Thermal Transmission | C 177, C 518, C 1045 | Measuring the core insulating efficiency of the thermal barrier. |
| Tensile Properties | D 638M | Determining the material’s resistance to pulling forces. |
| Flexural Properties | D 790 | Assessing structural stiffness and bending strength. |
| Impact Resistance (Izod) | D 256 | Evaluating toughness against sudden mechanical impacts. |
| Linear Thermal Expansion (CLTE) | D 696, E 228 | Measuring dimensional changes with temperature fluctuations. |
| Specific Gravity / Density | D 792, D 1622 | Verifying material consistency and void content. |
| Hardness | D 2240 | Assessing surface indentation resistance (Durometer). |
These tests are considered basic tests for physical property determination and are critical for comparing different materials and controlling manufacturing processes.
⚙️ Significance, Terminology, and Safety Compliance
According to Section 4.1, tests made on thermal break materials using this guide are of considerable value in comparing physical properties of different materials, controlling manufacturing processes, and writing specifications. Definitions are in accordance with Terminologies D 883 and D 1600.
💡 Terminology Tip: The standard defines a “thermal break” as a solid or cellular material, or combination of materials, of low thermal transmission placed between components of high thermal transmission in order to reduce the heat flow across the assembly.
⚡ Safety Precaution: Per Section 1.3, this standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
❓ Frequently Asked Questions
🔍 What is the specific mold size recommended for preparing test samples?
The standard guide recommends an aluminum mold with dimensions of 305 mm by 152 mm, prepared according to the manufacturer’s recommended procedures.
💡 Which standards are used to measure the thermal transmission properties of the material?
The guide references ASTM C 177 (Guarded Hot Plate), ASTM C 518 (Heat Flow Meter), and Practice C 1045 for calculating thermal transmission properties from steady-state heat flux measurements.
⚡ What is the formal definition of a “thermal break” in this standard?
A thermal break is defined as a solid or cellular material, or combination of materials, of low thermal transmission placed between components of high thermal transmission to reduce heat flow across the assembly.
📌 Is there an ISO equivalent to ASTM D5140-95?
No, Note 1 of the standard explicitly states: “There is no similar or equivalent ISO standard.”