S-LAL18

Code(d) 729547
Code(e) 732544
1.72916 54.7 0.01334
Refractive Index nd Abbe Number νd Dispersion nF-nC
1.729157 54.68 0.013335
Refractive Index ne 1.732336 Abbe Number νe 54.45 Dispersion nF'-nC' 0.013449

Refractive Indicies Partial Dispersions Relative Partial Dispersions

λ(µm) nC-nt 0.010994 θC,t 0.8244
n2325 2.32542 1.68936 nC-nA' 0.004641 θC,A' 0.3480
n1970 1.97009 1.69701 nd-nC 0.004056 θd,C 0.3042
n1530 1.52958 1.70504 ne-nC 0.007235 θe,C 0.5426
n1129 1.12864 1.71190 ng-nd 0.016539 θg,d 1.2403
nt 1.01398 1.71411 ng-nF 0.007260 θg,F 0.5444
ns 0.85211 1.71790 nh-ng 0.006035 θh,g 0.4526
nA' 0.76819 1.72046 ni-ng 0.016335 θi,g 1.2250
nr 0.70652 1.72279 nC'-nt 0.011640 θ'C',t 0.8655
nC 0.65627 1.72510 ne-nC' 0.006589 θ'e,C' 0.4899
nC' 0.64385 1.72575 nF'-ne 0.006860 θ'F',e 0.5101
nHe-Ne 0.6328 1.72635 ni-nF' 0.022835 θ'i,F 1.6979
nD 0.58929 1.72904
nd 0.58756 1.72916 Thermal Properties Coloring
ne 0.54607 1.73234 Strain Point StP (℃) 632 λ80 37
λ5 29
nF 0.48613 1.73844 Annealing Point AP (℃) 655 λ70
nF' 0.47999 1.73920 Transformation Temperature Tg (℃) 685
nHe-Cd 0.44157 1.74473 Yield Point At (℃) 699 Internal Transmittance
ng 0.435835 1.74570 Softening Point SP (℃) 731 λ(nm) τ10mm
nh 0.404656 1.75173 Expansion Coefficients (-30~+70℃) 59 280 0.04
ni 0.365015 1.76203 -7
α (10 /℃) (+100~+300℃) 69 290 0.21
Thermal Conductivity k (W/m·K) 0.871 300 0.30
Deviation of Relative Dispersions ∆θfrom "Normal" 310 0.32
ΔθC,t 0.0212 Mechanical Properties 320 0.55
8 2
ΔθC,A' 0.0058 Young's Modulus E (10 N/m ) 1204 330 0.68
8 2
Δθg,d -0.0109 Rigidity Modulus G (10 N/m ) 467 340 0.78
Δθg,F -0.0086 Poisson's Ratio σ 0.289 350 0.86
Δθi,g -0.0422 Knoop Hardness Hk[Class] 720 7 360 0.912
Abrasion Aa 70 370 0.946
5
Constants of Dispersion Formula Photoelastic Constant β (nm/cm/10 Pa) 1.58 380 0.967
A1 1.50276318E+00 390 0.978
A2 4.30224497E-01 Chemical Properties 400 0.984
A3 1.34726060E+00 Water Resistance(Powder) Group RW(P) 1 420 0.991
B1 1.45462356E-02 Acid Resistance(Powder) Group RA(P) 4 440 0.994
B2 -3.32784153E-03 Weathering Resistance(Surface) Group W(S) 1 460 0.996
B3 9.33508342E+01 Acid Resistance(Surface) Group SR 51.2 480 0.997
Phosphate Resistance PR 2.0 500 0.998
Other Properties 550 0.999
Bubble Quality Group B 600 0.998
Specific Gravity d 4.18 650 0.999
Remarks 700 0.999
800 0.998
Temperature Coefficients of Refractive Index 900 0.998
-6
Range of Temperature dn/dt relative (10 /℃) 1000 0.997
(℃) t C' He-Ne D e F' g 1200 0.996
-40~-20 3.8 3.9 4.1 4.5 4.8 1400 0.991
-20~ 0 3.8 3.9 4.1 4.5 4.9 1600 0.991
0~20 3.8 4.0 4.2 4.6 4.9 1800 0.982
20~40 3.9 4.1 4.3 4.7 5.1 2000 0.956
40~60 4.0 4.2 4.4 4.9 5.3 2200 0.87
60~80 4.2 4.4 4.6 5.1 5.5 2400 0.60
OHARA 02-06