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🔬 Scope and Method Applicability ASTM standard D4660-23 defines the procedures for measuring the isomer content of toluene-2,6-diisocyanate (2,6-TDI) or toluene-2,4-diisocyanate (2,4-TDI) in technical-grade TDI mixtures. To ensure accuracy across a wide range of concentrations, two distinct analytical methods are…
🔬 Principles and Test Methods Overview ASTM D4661-23 establishes two distinct test methods for the determination of total chlorine in aromatic isocyanates, which are critical raw materials for polyurethane production. The core principle for both methods involves the complete oxidative…
📐 Test Method Overview These test methods, designated ASTM D4659-19, provide procedures for determining the specific gravity of isocyanates essential in polyurethane production. They are applicable to toluenediisocyanate, polymeric methylene phenylisocyanate, and liquid methylene di(phenylisocyanate), as well as many other…
📖 Scope and Applicability ASTM D4657-92 is a standard test method for the determination of polynuclear aromatic hydrocarbons (PAHs) in water and wastewater. It has been successfully applied to distilled water, tap water, surface water, and wastewaters such as effluent…
📐 Test Method Overview and Significance Sulfide ion is commonly found in ground waters and wastewater, leading to odor and corrosion issues. This standard test method (D4658-15) provides a reliable means for sulfide measurement using an ion-selective electrode. The method…
ASTM D4655-95 (Reapproved 2023) provides standardized test methods for determining total, neutral, and combined acid sulfates in mineral-tanned leather. These methods are critical for evaluating leather basicity when used in conjunction with Test Method D4654. The gravimetric analysis involves precise…
📐 Composition and General Requirements This specification, D 4656-98, covers prediluted aqueous ethylene glycol base engine coolant with a minimum of 50 volume % ethylene glycol. It is formulated for use in automobiles and light-duty vehicles, providing effective cooling system…
ASTM D4653-87 (Reapproved 2020) specifies the standard test method for determining total chlorides in leather, particularly mineral tanned leather. The procedure employs a titration technique with silver nitrate to quantify chloride content, essential for quality control and material specification. 🧪…
🔬 Purpose and Significance of Sulfate Basicity This test method, designated D4654‑87 (Reapproved 2020), is issued under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.06 on Chemical Analysis. Its primary scope is…
ASTM D4652-20 establishes the specifications for new polydimethylsiloxane silicone liquid intended for use as an insulating and cooling medium in electrical equipment like transformers, capacitors, and electronic assemblies. This standard is critical for ensuring the safety and reliability of high-voltage…