S-PHM52Q has improved processability and chemical durability of S-PHM52
12.25.2019
We are pleased to introduce S-PHM52Q as an optical glass which has improved processability and chemical durability desired in the PHM region. S-PHM52Q has the same refractive index and abbe number as S-PHM52.
In addition, glass materials in the PHM region generally have a characteristic that the large value of dn/dT in the negative direction.
The dn/dT value of S-PHM52Q is close to 0, enabling optical design that suppresses the effects of temperature drift.
(Product features)
1.Improved chemical durability
Water Resistance [RW(p)]: Class 1, Acid Resistance[RA(p)]: Class 3
2.Improved mechanical durability Abrasion (Aa): 313
3.The dn/dT value is close to 0 dn/dT -0.7×10-6/℃
4.Low specific gravity (conventional ratio): 3.51
S-PHM52Q
(New Product) |
S-PHM52
(Current Product) |
||
Eco Optical Glass | ○ | ○ | |
Refractive Index nd | 1.61800 | 161800 | |
Abbe Number νd | 63.32 | 63.33 | |
dn/dT relative
D line 40~60℃ (10-6/℃) |
-0.7 | -3.6 | |
CTE α
(10-7/℃) |
-30~+70℃ | 88 | 101 |
+100~+300℃ | 103 | 120 | |
Transformation Point Tg(℃) | 577 | 587 | |
Yield Point At(℃) | 614 | 617 | |
Coloring | λ80 | 365 | 370 |
λ5 | 325 | 325 | |
Chemical Resistance | RW(P) | 1 | 1 |
RA(P) | 3 | 4 | |
W(S) | 1 | 2 | |
SR | 51.0 | 5.0 | |
PR | 4.0 | 4.0 | |
Specific Gravity | 3.51 | 3.67 | |
Knoop Hardness Hk | 420〔4〕 | 390〔4〕 | |
Abrasion Aa | 313 | 434 | |
Detail Catalog DATA | |||
Available shapes | •pressing •Saw Cut Centerless Ground Cylindrical Blanks •Dimensional Specified Blanks |
•pressing •Saw Cut Centerless Ground Cylindrical Blanks •Dimensional Specified Blanks・ |