Standard Test Methods of Sampling and Grading Rosin

Importancia y uso:

4.1 Rosin is an important product of the centuries old Naval Stores industry, now known as the Pine Chemical industry, and is produced and consumed in many countries throughout the world. Consequently, reliable methods of sampling and grading rosin are necessary. The test methods based on the use of the USDA Official Standards described herein, were developed many years ago for the sampling and grading of rosin and are similar to those included in the Naval Stores Act.3

4.2 Although these test methods based on the use of the USDA Official Standards are still applicable, many additional test methods are now used to grade rosin. In particular, the color of rosin is now more commonly reported using the Gardner color scale rather than the USDA Official Standards. In addition, Test Methods E28, D465, and D5974 are widely used to assess the quality of rosin in addition to the color grading methods described in this standard. The Naval Stores Act of 1923 established the methods for grading rosin and authorized the “Official Naval Stores Standard of the United States”. Based upon a request from the chairman of the ASTM D01.34 Pine Chemicals and Hydrocarbon Resins subcommittee requesting that the Gardner color scale be used for grading the color of rosin, a letter from the Food and Drug Administration was received and is archived in Pine Chemicals Association4 files. It documents a no-objection response to the request to use the Gardner color scale as a standard for grading rosin and rosin derivatives. The no-objection response was conditioned on having a reliable correlation between the USRG Scale (the “Official Naval Stores Standard of the United States”) and the Gardner Color Scale. A correlation study of color measurements on the Gardner Color Scale and the USRG Scale was carried out by scientists at Tintometer, Inc, Amesbury, England. The results of the correlation were submitted to the Food and Drug Administration as supporting evidence for the use of the Gardner Color Scale in measuring or grading the color of rosin and rosin derivatives.

Subcomité:

D01.34

Referida por:

B0032-20, D1065-18R22, B0678-25, D5974-20

Volúmen:

06.03

Número ICS:

87.060.20 (Binders), 87.060.30 (Solvents)

Palabras clave:

colorimetric standards; Gardner color; rosin; USRG color;