Nekovové materiály

Oblast zaměření: Kůže
Komise : CEN/TC 289 (Leather)
Původce: CEN
K připomínkám do: 18.07.2022
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This guideline provides a list of recommended tests that can be used to assess the quality of chemicals used in tanning process.

This guideline applies to chemicals whose application has the same effect on leather, grouped in families.

Oblast zaměření: Ropné produkty
Komise : CEN/TC 19 (Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin)
Původce: CEN
K připomínkám do: 1.08.2022
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This document specifies a test method for the determination of the oxidation stability at 120 °C of fuels for diesel engines, by means of measuring the induction period of the fuel up to 20 h. The method is applicable to blends of FAME with petroleum-based diesel having a FAME content in the range between 2 % (V/V) and 50 % (V/V).

NOTE 1       An almost identical test method for oxidation stability at 110 °C is described in EN 15751 [1], which applies to pure FAME and diesel/FAME blends containing 2 % (V/V) of FAME at minimum. Other alternative test methods for the determination of the oxidation stability of distillate fuels are described in CEN/TR 17225 [3].

NOTE 2       The precision of this method was determined using samples with a maximum induction period of approximately 20 h. Higher induction periods are not covered by the precision statement; however, experience from EN 15751 indicates sufficient precision up to 48 h.

NOTE 3       The presence of cetane improver can reduce the oxidation stability determined by this test method. Limited studies with 2-ethyl hexyl nitrate (EHN) indicated that the stability is reduced to an extent which is within the reproducibility of the test method.

NOTE 4       For the purposes of this document, the term “% (V/V)” is used to represent the volume fraction.