Blue sodiocalcic glass

1. A blue soda-lime colored glass composed of glass-forming principal components and of coloring agents, characterized in that it comprises from 0.15 to 1.1% by weight of Fe 2 O 3 , has a redox factor not exceeding 45% and presents a dominant wavelength (λ D ) of between 491 and 493 nm, including the endpoints of that range, and a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+24.5 and comprises amongst its coloring agents less than 0.1% by weight of TiO 2 .

2. The colored glass as claimed in claim 1 and further including at least one of the following features (A) through (D)

(A) a light transmission (TLA4) of greater than or equal to 55%;

(B) a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+26.5;

(C) as coloring agents, a compound of at least one of the elements Cr, Ce, Co, Se, V, Ti, Mn; and

(D) it comprises the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.3–1.1%

FeO 0.10–0.30%

Co 0–0.0040%

Cr 2 O 3 0–0.0500%

V 2 O 5 0–0.0500%

and has the following optical properties:

55%<TLA4<85%

36%<TE4<60%

P<12%.

3. The colored glass as claimed in claim 2 and further including at least two of the features (A) through (D).

4. The colored glass as claimed in claim 2 and further including all of the features (A) through (D).

5. The colored glass as claimed in claim 1 and further including at least one of the following features (E) and (F):

(E) it comprises less than 0.5% by weight of CeO 2 ;

(F) it comprises less than 0.13% by weight of MnO 2 .

6. The colored glass as claimed in claim 1 , characterized in that it has a light transmission (TLA4) of greater than or equal to 70%.

7. The colored glass as claimed in claim 2 wherein it further comprises one of the following features (G) through (J):

(G) the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.3–0.7%

FeO 0.10–0.20%

Co 0–0.0020%

and has the following optical properties:

72%<TLA4<85%

49%<TE4<60%

3%<P<9%;

(H) the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.4–0.6%

FeO 0.11–0.16%

Co 0–0.0015%

and has the following optical properties:

74%<TLA4<80%

51%<TE4<58%

3%<P<7%

λ D <492 nm;

(I) the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.4–0.8%

FeO 0.16–0.23%

Co 0–0.0030%

and has the following optical properties:

70%<TLA4<77%

39%<TE4<50%

4%<P<10%; or

(J) the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.55–0.75%

FeO 0.16–0.23%

Co 0–0.0020%

and has the following optical properties:

70%<TLA4<74%

41%<TE4<48%

6%<P<9%

λ D <492 nm.

8. The colored glass as claimed in claim 1 , characterized in that it has a light transmission (TLA4) of less than 70%.

9. The colored glass as claimed in claim 1 , further characterized by one of the following (K) through (M):

(K) it comprises less than 0.01%, preferably less than 0.0050%, by weight of V 2 O 5 and less than 0.0020%, preferably less than 0.0015%, by weight of Cr 2 O 3 ;

(L) it comprises the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.6–1.1%

FeO 0.20–0.30%

Co 0–0.0040%

and has the following optical properties:

55%<TLA4<69%

30%<TE4<47%

6%<P<12%;

(M) it comprises the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.75–0.95%

FeO 0.22–0.28%

Co 0–0.0030%

and has the following optical properties:

63%<TLA4<69%

36%<TE4<45%

7%<P<11%

λ D <492 nm.

10. The colored glass as claimed in claim 1 , characterized in that it forms a motor-vehicle window.

11. The colored glass as claimed in claim 1 further characterized by a dominant wavelength (λ D ) of less than or equal to 492 nm.

12. The colored glass as claimed in claim 1 further characterized in that it comprises less than 1.0% by weight of Fe 2 O 3 .

13. A blue soda-lime colored glass composed of glass-forming principal components and of coloring agents, characterized in that it comprises from 0.15 to 1.1% by weight of Fe 2 O 3 , has a redox factor not exceeding 45% and presents a dominant wavelength (λ D ) of between 490 and 493 nm and a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+24;

further comprising the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.3–1.1%

FeO 0.10–0.30%

Co 0–0.0040%

Cr 2 O 3 0–0.0500%

V 2 O 5 0–0.0500%

and has the following optical properties:

55%<TLA4<85%

36%<TE4<60%

P<12%; and

the colored glass has a light transmission (TLA4) of less than 70%.

14. A blue soda-lime colored glass composed of glass-forming principal components and of coloring agents, characterized in that it comprises from 0.15 to 1.1% by weight of Fe 2 O 3 , has a redox factor not exceeding 45% and presents a dominant wavelength (λ D ) of between 490 and 493 nm and a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+24.5; and further comprising the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.3–0.7%

FeO 0.10–0.20%

Co 0–0.0020%

and having the following optical properties:

72%<TLA4<85%

49%<TE4<60%

3%<P<9%.

15. A blue soda-lime colored glass composed of glass-forming principal components and of coloring agents, characterized in that it comprises from 0.15 to 1.1% by weight of Fe 2 o 3 , has a redox factor not exceeding 45% and presents a dominant wavelength (λ D ) of between 490 and 493 nm and a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+24.5; and further comprising the following percentages by weight of coloring agents, the total amount of iron being expressed in the form of Fe 2 O 3 :

Fe 2 O 3 0.4–0.8%

FeO 0.16–0.23%

Co 0–0.0030%

and having the following optical properties:

70%<TLA4<77%

39%<TE4<50%

4%<P<10%.

16. A blue soda-lime colored glass composed of glass-forming principal components and of coloring agents, characterized in that it comprises from 0.15 to 1.1% by weight of Fe 2 O 3 , has a redox factor not exceeding 45% and presents a dominant wavelength (λ D ) between 491 and 493 nm, including the endpoints of that range, and a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+24.5, while TLA4 is greater or equal to 65.7, and comprises its coloring agents less than 0.1% by weight of TiO 2 .

17. A blue soda-lime colored glass composed of glass-forming principal components and of coloring agents, characterized in that it comprises from 0.15 to 1.1% by weight of Fe 2 O 3 , has a redox factor not exceeding 45% and presents a dominant wavelength (λ D ) between 491 and 493 nm, including the endpoints of that range, and a light transmission (TLA4) and an excitation purity (P) which satisfy the relationship P>−0.3×TLA4+24.5, while TLA4 is greater or equal to 72.07, and comprises amongst its coloring agents less than 0.1% by weight of TiO 2 .