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D3190-06 – Standard Test Method Technical Guide
📋 Scope and Classification of Chloroprene Rubber (CR)
ASTM D3190-06 outlines the standard materials, test formulas, and procedures for the evaluation and quality control of chloroprene rubber (CR). It categorizes CR into two types based on polymerization modifiers: sulfur modified types and mercaptan modified types. This standard serves as a referee method and is applicable for quality control, R&D, and customer acceptance.
🔍 Key Revision: This version substitutes 3-methyl thiazolidine thione-2 for ethylene thiourea (ETU) due to ETU being a suspected carcinogen.
🛠️ Standard Formulations and Sample Preparation
For Sulfur Modified CR, Standard Test Formulae Nos. 1 and 2 are used. For Mercaptan Modified CR, Formulae Nos. 3 and 4 are specified. Mixing follows Practice D3182 using a laboratory mill or Miniature Internal Mixer (MIM). Samples are prepared per Practice D3896.
| 🟦 CR Type | 📐 Standard Formulae | ⚡ Modifier |
|---|---|---|
| Sulfur Modified | Nos. 1 and 2 | Sulfur |
| Mercaptan Modified | Nos. 3 and 4 | Mercaptan |
📊 Key Test Methods and Evaluated Properties
Evaluated properties include Mooney scorch (D1646), cure characteristics via Oscillating Disk (D2084) or Rotorless Cure Meter (D5289), and stress/strain properties (D412). Unvulcanized rheological properties are measured per D6204.
| 📏 Property | 📐 Standard Method | 🎯 Key Parameters |
|---|---|---|
| Viscosity & Scorch | D1646 | Mooney Viscosity, Pre-Vulcanization |
| Cure Characteristics | D2084 / D5289 | Scorch, Cure Rate, Optimum Time |
| Stress/Strain | D412 | 100% & 300% Modulus, Tensile Strength, Elongation |
| Unvulcanized Rheology | D6204 | Shear Rheological Properties |
⚡ Note: Values are stated in SI units. Users must establish appropriate safety and environmental practices.
❓ Frequently Asked Questions
🔍 What is the difference in CR types in D3190?
CR is classified by modifiers: Sulfur modified (Formulae 1 & 2) and Mercaptan modified (Formulae 3 & 4).
💡 What was changed in the standard formula?
The revision substitutes 3-methyl thiazolidine thione-2 for ethylene thiourea (ETU) because of toxicity concerns.
⚡ What mechanical properties are tested?
Tensile properties per D412 (modulus at 100% and 300%, tensile strength, elongation at break), plus Mooney scorch and cure meter data.
📌 What is the mixing standard?
Mixing follows Practice D3182 and sampling follows Practice D3896.