JB/T 11432-2023 Glass fiber reinforcing disc for bonded abrasive products
1 Scope
This document specifies the product classification, code and designation, technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of glass fiber reinforcing discs for bonded abrasive products.
This document is applicable to the manufacture of glass fiber reinforcing discs for bonded abrasive products, for which phenolic resin is used as the main binder.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1549 Chemical analysis methods of glass, glass marble and vitreous fiber
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 7689.2 Reinforcements - Test method for woven fabrics - Part 2: Determination of number of yarns per unit length of warp and weft
JC 561.1 Glass fiber reinforcing mesh - Part 1: Glass reinforcing mesh for resinic grinding wheel
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
warp
yarn arranged along the length of a fabric (i.e., in the 0° direction)
3.2
weft
yarn that runs perpendicular to the length of a fabric, between the two sides of the fabric
3.3
warp density
number of warps per unit length in the weft direction of a fabric, expressed in pcs/25mm
3.4
filling density
number of wefts per unit length in the warp direction of a fabric, expressed in pcs/25mm
3.5
plain weave fabric
fabric weave formed by interweaving of warps and wefts up and down
3.6
leno and gauze weave fabric
fabric weave formed by twisting of the ground warps and crossing warps from two systems and the wefts from one system
3.7
mass per unit area
mass-to-area ratio of the mesh used for the reinforcing disc, expressed in g/m2
3.8
reinforcing disc without covering
reinforcing disc without any covering
3.9
reinforcing disc with covering
reinforcing disc with non-woven fabric, black paper or polyethylene film laminated on one side
3.10
alkali metal oxid content
sum of potassium oxide and sodium oxide content in glass fiber
3.11
combustible content
content of combustible components in the reinforcing disc
3.12
volatile content
content of volatile components in the reinforcing disc
3.13
tensile breaking force
force applied to cause the specimen to break in the tensile test, expressed in N
3.14
bias
deviation of wefts from their original position on the fabric
3.15
cover defect
apparent separation between the covering and the reinforcing disc of a reinforcing disc with covering
3.16
resin permeate
penetration of resin or laminating adhesive from a reinforcing disc with covering to the surface of the covering
3.17
raw edge
dispersion of glass fiber yarns caused by resin peeling off from the outer edge of a reinforcing disc or from the edge of its inner hole
3.18
incomplete
incomplete shape of reinforcing disc and covering
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification, code and designation
4.1 Product classification and code
4.2 Product designation
5 Technical requirements
5.1 Appearance
5.2 Dimensional limit deviations
5.3 Geometrical tolerances
5.4 Alkali metal oxid content
5.5 Combustible content
5.6 Volatile content
5.7 Warp density and filling density
5.8 Mass per unit area
5.9 Tensile breaking force
6 Test methods
6.1 Appearance
6.2 Dimensional limit deviations
6.3 Geometrical tolerances
6.4 Alkali metal oxid content
6.5 Combustible content and volatile content
6.6 Warp density and filling density
6.7 Mass per unit area
6.8 Tensile breaking force
7 Inspection rules
7.1 Type inspection
7.2 End-of-manufacturing inspection
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging
8.3 Transportation and storage
Annex A (Normative) Determination methods for combustible content and volatile content
A.1 Apparatuses
A.2 Sampling
A.3 Test steps
A.4 Data processing
Annex B (Normative) Determination methods for mass per unit area
B.1 Apparatuses
B.2 Sampling
B.3 Test steps
B.4 Data processing
Annex C (Normative) Determination methods for tensile breaking force
C.1 Apparatuses
C.2 Sampling
C.3 Test steps
C.4 Data processing
Figure C.1 Schematic diagram for warp specimen cutting
Figure C.2 Schematic diagram for weft specimen cutting
Table 1 Classification and code of fabric weave
Table 2 Classification and code of covering
Table 3 Appearance requirements
Table 4 Dimensional limit deviations
Table 5 Geometrical tolerances
Table 6 Tensile breaking force
Table 7 Test methods for appearance
Table 8 Test methods for dimensional limit deviations
Table 9 Test methods for geometrical tolerances
Table 10 Rejection classification
Table 11 Sample size and judgment array for Class A rejection
