A porous refractory in the K.sub.2OSiO.sub.2B.sub.2O.sub.3 system is formed by chemical direct foaming by heating to over 600 C., resulting in adherent black or white foam. The foam can function as highly porous thermal insulation, a high or low thermal emissivity surface, as a sealant for deteriorated refractory surfaces, as a filler for pockmarks/holes/gaps or as a bonding agent for parts with large gaps between them.

A cellular glass system for insulating an outer surface of a fluid carrying or storing vessel, such as a pipe, is disclosed. The system is comprised of segments of cellular glass insulation. A sealant is provided at the interface between adjacent cellular glass segments to seal the system from moisture and thermal intrusion.

A production method for a porous glass atomization core includes: S1: producing porous glass by: scheme one: a production method for the porous glass including: mixing glass powder, a fiber component, a pore-forming agent, and an additive phase to produce a green body, and performing debinding and sintering to obtain the porous glass; or scheme two: a production method for the porous glass including: mixing glass powder, a fiber component, and a pore-forming agent to produce a green body, and performing debinding and sintering to obtain the porous glass; and S2: using the porous glass as a substrate, and arranging a heating unit on the substrate.

Disclosed is a cellular glass product having a density D at ambient temperature of at most 200 kg/m.sup.3 and a process for the production of a cellular glass product having a density D at ambient temperature of at most 200 kg/m.sup.3. The process comprises the N steps of: a) contacting glass powder with foaming agent to form a dry mixture, b) thermally treating the mixture in a foaming furnace, thereby forming cellular glass, and c) annealing the cellular glass of step b) in an annealing lehr, wherein the concentration of at least one of the reagents in the dry mixture of step a) that are necessary for enabling the foaming reaction is at least 150% of the concentration N corresponding to the theoretical minimum requirement for obtaining the density D.

A method of producing flint glass using submerged combustion melting is disclosed. The method includes operating a submerged combustion melter such that combustion products are discharged from one or more submerged burners combusting a combustible gas mixture that comprises fuel and oxygen. An oxygen-to-fuel ratio of the combustible gas mixture ranges from stoichiometry to 30% excess oxygen relative to stoichiometry, a temperature of a glass melt in the submerged combustion melter is between 1200 C. and 1500 C., a residence time of the glass melt is maintained between 1 hour and 10 hours, and a specific throughput rate of molten glass discharged from the submerged combustion melter ranges from 2 tons per day per meter squared of cross-sectional area of the submerged combustion melter [tons/day/m.sup.2] to 25 tons/day/m.sup.2. A method of forming glass containers from the molten glass discharged from the melter is also disclosed.

A porous refractory in the K.sub.2OSiO.sub.2B.sub.2O.sub.3 system is formed by chemical direct foaming by heating to over 600 C., resulting in adherent black or white foam. The foam can function as highly porous thermal insulation, a high or low thermal emissivity surface, as a sealant for deteriorated refractory surfaces, as a filler for pockmarks/holes/gaps or as a bonding agent for parts with large gaps between them.

A porous refractory in the K.sub.2OSiO.sub.2B.sub.2O.sub.3 system is formed by chemical direct foaming by heating to over 600 C., resulting in adherent black or white foam. The foam can function as highly porous thermal insulation, a high or low thermal emissivity surface, as a sealant for deteriorated refractory surfaces, as a filler for pockmarks/holes/gaps or as a bonding agent for parts with large gaps between them.

A cellular glass insulation system for an outer surface of a structure or pipe. The insulation system includes multiple segments of cellular glass. An adhesive having a reduced permeability is provided at the interface between the individual cellular glass segments and is configured to limit water intrusion that might cause corrosion of the structure or pipe.

A silica glass porous body includes a plurality of pores. The pores include open pores, the silica glass porous body has a bulk density of 1.1 g/cm.sup.3 to 1.7 g/cm.sup.3, and the open pores have an average pore diameter of 50 m to 200 m, as determined by mercury intrusion porosimetry.

A method of making a porous structure configured for use in a particulate filter includes bonding a plurality of glass bubbles to one another, and breaching the plurality of glass bubbles. Voids within individual breached glass bubbles open into one another to form cavities that extend through the porous structure.