Astm Room Temperature Definition

[Chanelle Glugla]

Onthe outer packaging of pharmaceutical products one often finds labels with storage requirements like, for example, "ambient", "room temperature" and "cold chain". But what do they exactly mean? And do these conditions also apply during transport?

The second question is easy to answer: "The required storage conditions for medicinal products should be maintained during transportation within the defined limits as described by the manufacturers or on the outer packaging." (EU GDP Guidelines). But according to the PIC/S Good Distribution Guide these conditions should also be applied for transportation (see section 9.2.1).

And then there is the EMA GUIDELINE on DECLARATION OF STORAGE CONDITIONS from 2007, requiring that the storage conditions given in the package leaflet (PL) and the labelling of medicinal products should refer to the stability studies made for the finished product:

So, as a resume, terms like "ambient", "room temperature" and "cold chain" should be avoided as the only labelling for storage or transport boxes and containers because they are not always clear and might have different meanings in other parts of the world. Storage conditions are always better explicitly specified in terms of a defined temperature range (e.g., 15C -25C or +2C to +8C). Particular attention should be given to avoiding freezing of liquids and semi-solids.

Standard temperature and pressure (STP) or Standard conditions for temperature and pressure are various standard sets of conditions for experimental measurements used to allow comparisons to be made between different sets of data. The most used standards are those of the International Union of Pure and Applied Chemistry (IUPAC) and the National Institute of Standards and Technology (NIST), although these are not universally accepted. Other organizations have established a variety of other definitions.

In industry and commerce, the standard conditions for temperature and pressure are often necessary for expressing the volumes of gases and liquids and related quantities such as the rate of volumetric flow (the volumes of gases vary significantly with temperature and pressure): standard cubic meters per second (Sm3/s), and normal cubic meters per second (Nm3/s).

Many technical publications (books, journals, advertisements for equipment and machinery) simply state "standard conditions" without specifying them; often substituting the term with older "normal conditions", or "NC". In special cases this can lead to confusion and errors. Good practice always incorporates the reference conditions of temperature and pressure. If not stated, some room environment conditions are supposed, close to 1 atm pressure, 293 K (20 C), and 0% humidity.

Before 1918, many professionals and scientists using the metric system of units defined the standard reference conditions of temperature and pressure for expressing gas volumes as being 15 C (288.15 K; 59.00 F) and 101.325 kPa (1.00 atm; 760 Torr). During those same years, the most commonly used standard reference conditions for people using the imperial or U.S. customary systems was 60 F (15.56 C; 288.71 K) and 14.696 psi (1 atm) because it was almost universally used by the oil and gas industries worldwide. The above definitions are no longer the most commonly used in either system of units.[9]

Many different definitions of standard reference conditions are currently being used by organizations all over the world. The table below lists a few of them, but there are more. Some of these organizations used other standards in the past. For example, IUPAC has, since 1982, defined standard reference conditions as being 0 C and 100 kPa (1 bar), in contrast to its old standard of 0 C and 101.325 kPa (1 atm).[2] The new value is the mean atmospheric pressure at an altitude of about 112 metres, which is closer to the worldwide median altitude of human habitation (194 m).[10]

Natural gas companies in Europe, Australia, and South America have adopted 15 C (59 F) and 101.325 kPa (14.696 psi) as their standard gas volume reference conditions, used as the base values for defining the standard cubic meter.[11][12][13] Also, the International Organization for Standardization (ISO), the United States Environmental Protection Agency (EPA) and National Institute of Standards and Technology (NIST) each have more than one definition of standard reference conditions in their various standards and regulations.

In aeronautics and fluid dynamics the "International Standard Atmosphere" (ISA) is a specification of pressure, temperature, density, and speed of sound at each altitude. The International Standard Atmosphere is representative of atmospheric conditions at mid latitudes. In the US this information is specified the U.S. Standard Atmosphere which is identical to the "International Standard Atmosphere" at all altitudes up to 65,000 feet above sea level.[citation needed]

It is as important to indicate the applicable reference conditions of temperature and pressure when stating the molar volume of a gas[46] as it is when expressing a gas volume or volumetric flow rate. Stating the molar volume of a gas without indicating the reference conditions of temperature and pressure has very little meaning and can cause confusion.

The molar volume of gases around STP and at atmospheric pressure can be calculated with an accuracy that is usually sufficient by using the ideal gas law. The molar volume of any ideal gas may be calculated at various standard reference conditions as shown below:

The US Standard Atmosphere (USSA) uses 8.31432 m3Pa/(molK) as the value of R. However, the USSA in 1976 does recognize that this value is not consistent with the values of the Avogadro constant and the Boltzmann constant.[47]

The ASTM standards in tensile testing are globally recognized guidelines by ASTM International that define the essential procedures for testing materials such as metals and plastics. These standards define how to measure properties like tensile strength and elongation, guaranteeing accurate and consistent results vital for material quality and safety in different industries.

There is a good chance that you've heard of the acronym ASTM. In 1898, the American Society for Testing and Materials, or ASTM, was founded to develop and publish international guidelines and standards voluntarily. Today, these standards are key to many industrial processes, ranging from producing materials like reinforced steel beams in our houses to high-tech electronic components such as circuit boards in our phones. These standards are an integral part of product manufacturing.

Our focus in this article will be on ASTM standards in tensile testing, specifically the most prevalent ones. Our discussion will cover how these standards guide the manufacturing of a variety of products and how they ensure safety and quality. As part of our exploration, we will review the most commonly used ASTM standards and their practical applications.

It is important to understand the role standards play in general material testing before we discuss the standards themselves. Standards in material testing, particularly tensile testing, are crucial for guaranteeing a product's quality, safety, and reliability. From maritime to renewable energy, they assure the durability and performance of materials under specific conditions. A tensile test, for example, is needed in the maritime industry to verify the resilience of materials used in ship components under harsh sea conditions. Similarly, in the renewable energy sector, tensile testing confirms the endurance of wind turbine blade materials, assuring their efficiency and longevity.

These standards have been developed historically over several centuries, starting in the late 19th century and continuing until the early 20th century. This was a period marked by intense industrialization that necessitated the development of systematic testing methodologies. The American Society for Testing and Materials International (ASTM), established in 1898, along with the International Organization for Standardization (ISO), founded in 1947, have been at the forefront of creating these standards since the early 1900s. As a result of their efforts, many applications and industries have been able to maintain the integrity and consistency of the materials, preventing potential disasters from occurring.

In many cases, the reliability and safety of a product are directly related to compliance with tensile testing standards. In the automotive industry, for example, materials used in the construction of vehicles, such as steel in the axles and aluminum in the wheels, must undergo rigorous testing to withstand specific levels of stress to guarantee the safety of passengers in those vehicles.

Tensile Sample Preparation Standards specify the procedures for preparing test specimens. Specifically, they describe the size, shape, and treatment of samples prior to testing. These standards make sure that tensile test specimens are consistent and suitable for the intended testing procedures. This category includes standards such as ASTM E8/E8M, which specifies the preparation methods for metallic test specimens.

Tensile Testing Standards, on the other hand, concern actual testing procedures. There are detailed instructions on how to conduct tensile tests, including the types of equipment to be used, the type of testing environment, and the interpretation of results. Mechanical properties such as tensile strength, ductility, yield strength, and elongation are determined by these standards. A few examples are ASTM A370 for mechanical testing of steel products and ASTM D638 for plastic tensile properties.

Having these standards separated reflects the preparation phase and the actual testing phase of material testing. When performing tensile testing, it is essential to prepare the specimen properly in order to obtain accurate and meaningful results. A test result may not accurately reflect the properties of a material without following the specific guidelines for sample preparation. Likewise, tensile tests should be conducted according to standardized methods to compare materials and assess their suitability.

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