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D1056-20 – Standard Test Method Technical Guide
📐 Specimen Types and Material Requirements
This specification covers flexible cellular rubber products known as sponge rubber and expanded rubber. The base material may be made of synthetic, natural, or reclaimed rubber, and may contain other polymers or chemicals modified by organic or inorganic additives. These elastomeric materials have properties similar to vulcanized rubber, including the ability to convert from thermoplastic to thermosetting state by crosslinking and substantial recovery of original shape when strained.
Extruded or molded shapes that are too small for cutting standard test specimens are difficult to classify or test by these methods and will usually require special testing procedures. The values stated in inch-pound units are to be regarded as standard, with SI units provided in parentheses for information only.
⚙️ Test Procedures and Referenced Standards
The standard incorporates numerous ASTM test methods for evaluating properties of flexible cellular materials. The following table summarizes key referenced standards:
| 🟦 Standard | 📏 Test Method | 🎯 Application |
|---|---|---|
| D395 | Compression Set | Test Methods for Rubber Property—Compression Set |
| D412 | Tension | Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension |
| D471 | Effect of Liquids | Test Method for Rubber Property—Effect of Liquids |
| D573 | Air Oven Aging | Test Method for Rubber—Deterioration in an Air Oven |
| D575 | Compression | Test Methods for Rubber Properties in Compression |
| D624 | Tear Strength | Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers |
| D2632 | Resilience | Test Method for Rubber Property—Resilience by Vertical Rebound |
Reference to the test methods in this specification should specifically state the particular test or tests desired. The test methods portions include safety caveats, and users must establish appropriate safety practices.
📊 Key Measured Properties
Key properties evaluated include compression set, tensile strength, tear resistance, and liquid resistance. Compliance with this specification requires adherence to the referenced test methods. For example, compression set is measured per D395, tension per D412, and aging per D573. The ability to crosslink and recover shape after strain is inherent to vulcanized rubber materials.
💡 Tip: When testing, ensure that specimens are prepared as per D3182 and D3183 for consistency. Also, note that ISO 6916-1 is similar to this specification.
⚠️ Safety Precautions: The user must establish appropriate safety, health, and environmental practices. This standard does not address all safety concerns. Applicable regulatory limitations should be determined before use.
❓ Frequently Asked Questions
🔍 What products are covered under D1056-20?
The specification covers flexible cellular rubber products such as sponge rubber and expanded rubber, but does not apply to latex foam rubber or ebonite cellular rubber.
💡 What is the base material composition allowed?
The base material can be synthetic, natural, or reclaimed rubber, and may include other polymers or chemicals modified with organic or inorganic additives.
⚡ Which test methods are referenced for compression properties?
Test Methods D395 and D575 are referenced for compression set and compression properties, respectively.
📌 Are SI units standard in this specification?
No, the values stated in inch-pound units are standard, and SI units in parentheses are for information only.