Glass compositions and glass laminate articles comprising the same

A method for forming a glass laminate article, the method comprising:

• fusing at least one glass cladding layer to at least a portion of a glass core layer, wherein the at least one glass cladding layer comprises a phase separable glass composition and comprises:
• greater than or equal to 50 mol % and less than or equal to 80 mol % SiO2;
• greater than or equal to 5 mol % and less than or equal to 15 mol % Al2O3;
• greater than or equal to 10 mol % and less than or equal to 25 mol % B2O3;
• greater than or equal to 0 mol % Li2O;
• greater than or equal to 0 mol % Na2O;
• greater than or equal to 0 mol % K2O;
• greater than or equal to 0 mol % Rb2O;
• greater than or equal to 0 mol % Cs2O;
• greater than or equal to 1.5 mol % and less than or equal to 5 mol % MgO;
• greater than or equal to 4 mol % and less than or equal to 12 mol % CaO;
• and
• greater than or equal to 0.5 mol % and less than or equal to 5 mol % SrO, wherein:
• R2O is greater than or equal to 0.1 mol % and less than or equal to 15 mol %, R2O being the sum of Li2O, Na2O, K2O, Rb2O, and Cs2O;
• heating the at least one glass cladding layer fused to the glass core layer to a temperature sufficient to effect a phase separation in the at least one glass cladding layer such that, after the heating, the at least one glass cladding layer comprises a first phase and at least one second phase, each of the first phase and the at least one second phase having different compositions;
• and
• etching the phase separated at least one glass cladding layer with an etching solution to selectively remove the at least one second glass phase from the at least one glass cladding layer such that the at least one glass cladding layer comprises a porous, interconnected matrix formed from the first phase of the phase separable glass composition.