📜 Scope and Classification System ASTM D4673-23 establishes a standard classification system for ABS plastics and alloys intended for injection molding and extrusion processes. This standard applies exclusively to ABS materials and their alloys, covering compositions suitable for these processes,…

🧪 Overview and Scope ASTM D4674-19 is a standard practice that outlines the basic principles and operating procedures for accelerated testing of color stability in plastics exposed to indoor office environments. It specifically addresses conditions where fluorescent overhead lighting and…

🔬 Principle and Scope of ASTM D4672-24 ASTM D4672-24 is the standard test method for determining the water content of polyols and many other organic compounds used in polyurethane manufacturing. The method is based on the classic Karl Fischer titration…

📖 Scope and Significance of ASTM D4670 ASTM D4670-17 (Reapproved 2022) provides a standardized visual inspection procedure for determining the presence of insoluble foreign material in polyols, which are key raw materials in the production of polyurethane. Designated under the…

📐 Scope and Significance ASTM D4671-21 outlines a standard test method for measuring unsaturation in polyether polyols, a critical parameter for polyurethane raw materials. The method specifies a potentiometric titration using a small sample mass (approximately 1 g or less)…

🧪 Summary and Significance This test method, ASTM D4667-93, determines the acidity of toluene-2,4-diisocyanate and toluene-2,6-diisocyanate or their mixtures. It is vital for research and quality control in polyurethane manufacturing, as acidity impacts system performance. The method reacts isocyanates with…

ASTM D4669-24 defines standard procedures for determining the specific gravity of polyols, which are critical raw materials in the polyurethane industry. This property is essential for quality control, specification testing, and research. Accurate specific gravity values are required for converting…

The ASTM D4664-93 standard provides a precise methodology for determining the freezing point of toluene diisocyanate (TDI) mixtures, specifically the 2,4- and 2,6-isomer blends. This test method is essential for assessing the purity and consistency of these crucial polyurethane raw…

📐 Scope and Terminology These test methods, designated D4662-20, are used to measure the acidic and basic constituents in polyols and other materials of high acidity or alkalinity that are soluble in mixtures of toluene and ethyl alcohol. They are…

🔍 Test Overview and Scope This standard test method, D4663-20, determines the hydrolyzable chlorine content of toluene diisocyanates (TDI), specifically toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, or mixtures thereof. It is also acceptable for other isocyanates with suitable solubility, such as crude polymeric isocyanates,…

🔬 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…