For global manufacturers, understanding the difference between ASTM and ISO standards is crucial. The ASTM D618-21 PDF contains a direct note comparing it to . Both standards address the conditioning of plastics; however, they differ in technical content. The note explains that ISO 291 describes only two temperature and humidity conditions for conditioning or testing, whereas ASTM D618-21 provides a broader, more flexible framework. This distinction is vital for companies shipping products to different regulatory regions.
The primary goal of ASTM D618-21 is to establish reproducible results by bringing plastic specimens into a consistent state before and during testing. Conditioning is typically performed to:
Note: For tests demanding higher precision, tighter tolerances of ± 1 °C and ± 5% RH are actively invoked. The Primary Conditioning Procedures astm d61821 pdf
This is the most widely utilized default method for general testing.
ASTM D618 Plastic Specimen Conditioning Testing - Infinita Lab The note explains that ISO 291 describes only
How strongly the finish is bonded to the leather substrate. Strength: The resistance to breakdown under stress.
: This method does not apply to wet blue (un-finished, chrome-tanned leather). Equipment and Apparatus Requirements Conditioning is typically performed to: Note: For tests
±1.8∘Fplus or minus 1.8 raised to the composed with power F