This Gulf standard specifies preferred temperatures for use in testing. The aim of this Gulf standard is to rationalize, harmonize and simplify the choice of temperature in the future. In drawing up test methods and specifications, the temperatures chosen should, as far as possible, be taken from these preferred temperatures. It is permissible nevertheless to use other temperatures when this is considered essential for technical reasons. A list of additional temperatures taken from international technical documents is given in an annex. These temperatures either represent existing practice or are chosen to meet particular technical needs. It is hoped for the future that consideration will be given to using the temperatures given in the lists in clause 2 as far as technical considerations permit when revising international documents. If no technically suitable temperature exists in the lists in clause 2, consideration should not be given to temperatures in related fields in the list in the annex.