Since the production methods (hot process PF and cold process PF) differ by required PF specification, the transmittance is slightly different between them. Both hot process PF glass and cold process PF glass are listed in this catalog. When you order PF, please provide us with your drawing for the product. We will prepare the PF drawing based on your information. We will take into consideration the production methods, the technical requirements as well as applying the following standards.

1. BALL PF (Heat Process PF)

Ball PF weight tolerance, diameter and its tolerance, long and short axis difference is shown in Table 5.

Table5 : diameter and its tolerance, long and short axis difference, weight tolerance.

volume (mm3)	diameter (mm)	diameter tolerance(mm)	long and short axis difference(mm)	weight tolerance(mg)
3.0 - 8.0	1.8 - 2.5	±0.07	≤ 0.1	±0.5 - 3
8.0 - 30.0	2.5 - 3.9	±0.07 - 0.10	≤ 0.15	±3 - 7
30.0 - 140.0	3.9 - 6.4	±0.10 - 0.15	≤ 0.20	±7 - 10

(≤400mg)

2. Gob PF (Heat Process PF)

Gob PF diameter and its tolerance, radius curvature, long and short axis difference, Weight tolerance are shown in Table 6-1,6-2.

Table 6-1 Weight tolerance, diameter and its tolerance, long and short axis difference

volume(mm3)	diameter(mm)	diameter tolerance(mm)	thickness(mm)	thickness torelance(mm)
180	- 7.0	±0.10	- 5.0	±0.05
180 - 350	7.0 - 10.0	±0.10 - 0.15	5.0 - 7.5	±0.10
350 - 530	10.0 - 11.5	±0.15	6.0 - 7.5	±0.15
530 - 700	11.5 - 13.5		6.0 - 8.0
700 - 1000	13.5 - 14.5		7.0 - 9.0
1000 - 1800	14.5 - 15.9	±0.20	8.5 -	±0.20

(≤5000mg)

Table 6-2

radius curvature				long and short axis difference(mm)	weight tolerance(mg)
R１	tolerance	R2	tolerance
4.0 - 6.5	±1.0	6.0 - 12.0	±2.0	≤0.1	±5 - 7
5.0 - 8.0	±1.5				±7 - 20
7.0 - 10.0	±2.0	7.0 - 20.0	±2.5	≤0.2	±25
7.0 - 15.0	±2.5	10.0 - 30.0	±3.0
10.0 - 17.0	±3.0	15.0 - 35.0	±4.0	≤0.3	±30
10.0 -	±4.0	15.0 -	±5.0	≤0.4	±50

3. Cold Process PF

Please consult us for the detailed specification.