The calibrated tensile force values are all tested under the conditions of cement strength of 260 ~ 300 kgs/cm2, and the maximum value of the safety load must not exceed 25% of the calibrated value.
China 10PCS White/Colour Dustless Chalk,China School Chalk,China Tailoring
Product Description 1
Material
Gypsum
2
Colors
White and Color
3
Use for Used to mark on gar...