Process of production of a glass intended to be transformed into continuous or stable fibers

A process for the production of glass for use in forming glass fibers, said glass containing Fe.sub.2 O.sub.3 in an amount of 1 weight % or less by weight, said process comprising:

• melting a mixture of vitrifiable products to produce a molten glass;
• and
• incorporating in said mixture at least two oxidizing agents wherein a first oxidizing agent comprises calcium nitrate, and a second oxidizing agent comprising a natural raw material that supplies MnO.sub.2 or Mn.sub.2 O.sub.3 to regulate the degree of oxidation of the molten glass produced from said mixture;
• and
• selecting said oxidizing agents to maintain the ratio of FeO to Fe.sub.2 O.sub.3 in the molten glass at a value equal to or less than a weight ratio of 0.4.

A mixture for producing glass fibers, comprising:

• vitrifiable products;
• a first oxidizing agent comprising calcium nitrate;
• and
• a second oxidizing agent comprising at least one agent selected from the group consisting of an oxidized compound of manganese in which said manganese is in a state of oxidation greater than two and potassium dichromate for regulating the degree of oxidation of the molten glass.