Gum rosin
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of gum rosin.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition applies.
GB/T 8146-2003 Test methods for rosin
LY/T 1145 Packaging barrels for rosin
ASTM D 509-1998 Standard test methods of sampling and grading rosin
3 Product types and specifications
3.1 Gum rosin (hereinafter referred to as rosin) is an amorphous transparent glassy solid resin, which is obtained by distilling turpentine from pine gum collected from standing pine trees. Its main chemical component is monobasic resin acid, and its molecular formula is C20H30O2.
3.2 Rosin is classified into six grades: special grade, Grade 1, Grade 2, Grade 3, Grade 4 and Grade 5. Other rosin products are off-grade. The grades specified in this standard are similar to the corresponding grades specified in ASTM D 509-1998, which are expressed by X, WW, WG, N, M and K, but they are not equal and the latter can be used as reference.
4 Requirements
The technical indexes of various grades of rosins shall meet those specified in Table 1.
Foreword i
1 Scope
2 Normative references
3 Product types and specifications
4 Requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
Annex A (Normative) Crystallization and sulfur containing
