Glass Block Technology recommend the use of Colmef Vetromix glass block mortar when constructing brick by brick. Colmef Vetromix is used as a bedding mortar and then by slightly diluting the mix it can be used as a grout for finishing.

Colmef Mortar approximate number of blocks per 10kg bag calculation

Block Blocks per m2 Blocks per bag Blocks per bag Blocks per bag 10mm joint 10mm joint curved 6mm joint

	Block	Blocks per m2	Blocks per bag 10mm joint	Blocks per bag 10mm joint curved	Blocks per bag 6mm joint
	115x115x80	64	19	16	32
	146x146x80	44	16	13	27
	146x146x98	44	13	11	22
	190x90x80	50	16	13	22.5
	190x190x80	25	12	10	20
	190x190x10	25	10	8	16
	240x115x80	32	13	11	21
	240x240x80	16	9.5	8	16
	300x300x100	10	6	5	10

SUITABILITY

Colmef Vetromix can be used internally or externally for straight and curved glass block panels.

Mixing instructions for Colmef Vetromix can be found on the reverse of each bag. Colmef Vetromix requires mixing with clean water only to make it workable, the powder already contains hydraulic binders, inert and synthetic resins.

Colmef Vetromix is a very pure shade of white.

Colmef Vetromix can be coloured by mixing it with special colouring compounds.

When Colmef Vetromix is completely cured it becomes totally water repellent.

When constructing glass block walls with Colmef Vetromix always ensure that the surrounding temperature is not 5°C and falling or 30°C and rising.

No joint width should exceed 22mm.

Never grout over perimeter expansion joint, always silicone.

TECHNICAL CHARACTERISTICS OF COLMEF VETROMIX GLASS BLOCK MORTAR

Figures stated were taken at 23°C at 50% RH and in lack of ventilation.

• PH of mixture : 12.8 

• Minimum joint size for a curved panel : 4mm 

• Maximum joint size relating to the external joint for a curved panel : 22mm 

• Compressive resistance after 28 days : 19.5N/mm² 

• Flexible resistance after 28 days : 7.5N/mm²   

• COSHH Data sheets are available for Colmef Vetromix on request from Glass Block Technology.

• Colmef Vetromix retains the glass block panel at a U value of 2.9W/m2°C. Wet sand and cement mix increase panel to 3.2W/m²  °C.