•the hot process PF "MP-" •the cold process PF "MC-"

Since the melting process between the hot process PF and the cold process PF are different, the glass properties are different.
Due to the restrictions on the manufacturing method, hot PF has a range that can be handled, and currently the target volume is less than 3500 mm³. In the case of a glass type with a specific weight of 2.82, the weight is equivalent to 9870 mg.
This catalog lists both types of hot process PF.
One type is called GOB PF for larger sizes the hot process PF. The other type is called ball PF for small sizes.
We will supply the cold process PF for volumes and weights the exceed limits described above for the hot process PF.

Table 1, The type of production process

less than 3500 mm3	hot process PF	Ball PF	Ball PF is formed into a ball shape directly from melting furnace and simple annealing is applied.
		Gob PF	Gob PF is formed into a Gob shape directly from the melting furnace and simple annealing is applied.
over 3500 mm3	cold process PF	Spherical polished PF	Spherical polished PF is formed into a both-side polished throagh conventional polishig process.
		Pressed blanks for polished PF	Pressed blanks etc for above spherical polished PF.

Please consult us for the detailed specification of PF.