Harrow Glass & Building Supplies

Glass, Plumbers & Timbers Merchants & Lock Specialist-                                                                                             180 Pinner Road, Harrow, Middlesex. HA1 4JP               Tel: 020 8863 2420     Or    020 8248 2390


Glass Types

Glass can be used for more than just windows and mirrors. Different types of glass can be used to enhance the aesthetic appeal of a room, or as an artistic focal point in of itself. 


When people think of "glass", usually they picture the completely transparent type used for windows or showers. Either that or the metal backed, super reflective glass used for mirrors. Little do they know that there is a world of glass, and glass applications, beyond these most common types. Variety of glass types available with various glass thicknesses.  


Float Glass

Float glass or annealed glass is a single sheet of glass made to a uniform thickness, often referred to as 'ordinary glass'. Float glass is brittle and can shatter on impact into sharp and dangerous fragments, for this reason it is not a safety glass. 


Typically used for: 

Domestic glazing and double glazing.

Small shelves and table tops.

Low risk glazing (see diagram).

Float glass is available from Wholesale Glass, as stock, or processed, in various types and thicknesses including


Clear, low iron, low-emissivity, satin, a wide range of tinted solar control, anti-sun grey / bronze / green / blue, self-cleaning, one-way 'spy glass' and various patterns 






Laminated Glass


Laminated glass is a type of safety glass that holds together when shattered. In the event of breaking, it is held together by an interlayer, typically of polyvinyl butyral (PVB), between its two or more layers of glass. The interlayer keeps the layers of glass bonded even when broken and its high strength prevents the glass from breaking up into large sharp pieces. This produces a characteristic "spider web" cracking pattern, when the impact is not enough to completely pierce the glass.


Laminated glass is normally used when there is a possibility of human impact or where the glass could fall if shattered. The principal feature of laminated glass is it 's safety performance, achieving it's BS 6206 mark, but it can also be used for security. Multiple layers of glass laminated together can even become bullet and ballistic resistant.


Typically used for:


Shopfronts, schools and public areas.

Overhead / sloped roofs.

Banks and secured environments.

Single and double glazing.

Laminated glass is available from Harrow Glass, as stock, or processed, in various types and thicknesses including:


Clear, white diffused and stippolyte.


 6.4mm, 7.5mm, 8.8mm, 9.5mm, 10.8mm, 11.5mm, 12.8mm, and13.5mm. 




Toughened Glass


Toughened or tempered glass is a type of safety glass that has been processed by controlled thermal treatment, to increase its strength compared with normal glass (annealed glass). Toughened glass is made through a process which creates balanced internal stresses, this gives the glass five times the strength of float glass.


Toughened glass will usually shatter into small fragments instead of sharp shards when broken, making it less likely to cause severe injury and deep lacerations. As a result of its safety and strength, achieving BS 6206, toughened glass is used in a variety of demanding applications.




  • Stronger Tempered glass is 5-8x as impact resistant as ordinary glass, with bending strength 4-5x as powerful. Tempered glass can stand higher static pressure loads than regular glass.
  • Thermally Stable (Less Heat Sensitive): Thermal stability is the property that allows glass to resist temperature differences. It is measured by the temperature difference that would cause the glass to crack. The thermal stability of tempered glass is 1.5-2x better than annealed (regular) glass. This means that while annealed glass would crack at 100 degrees Celsius, tempered glass can withstand temperatures of up to 320 degrees Celsius before cracking. It’s this quality that makes tempered glass perfect for the outdoor heat.
  • Safer Tempered glass has many applications because of its safety characteristics. The safety of tempered glass comes from strength and its unique fracture pattern. When tempered glass breaks, it breaks into small, relatively harmless blunt glass fragments. This is called “dicing,” and reduces the likelihood of injury since there are no dangerous jagged edges or sharp shards. 



Typically used for:


AP glass doors, shower doors and all glass shopfronts.

Balustrades and bolted glass assemblies.

Shelves and table tops.

Single and double glazing.

Toughened glass from Harrow Glass is processed in various types and thicknesses, including:


Clear, low iron, low-emissivity, satin, a wide range of tinted solar control, anti-sun grey / bronze / green / blue, self-cleaning and various patterns.


4mm, 6mm, 8mm, 10mm, 12mm, 15mm, 19mm


                                Tempered Glass


                          Normal Glass (Annealed Glass)


 Why Glass Table Tops?

  • Protect your furniture from nicks, scratches, and other possible damage.
  • Refresh older pieces with a less permanent option, as compared to stains or paint.
  • Glass is beautiful; a glass top is an excellent way to add shine to an otherwise dull item.
  • Elevate the impact of wood tables or dressers while protecting these investments from scratches, glass rings, sun damage and scuffs.
  • Order a table top to complete a table, nightstand or even a plant stand.
  • Renew old glass table inserts with a glass table replacement; outdoor tables are especially vulnerable to damage and weathering. 


Fire Resistant Glass

Fire resistant glass is specifically designed to provide a consistent, high level of protection against fire, together with the full range of properties associated with glass. Harrow Glass produce a wide range of fire glass types, offering increasing levels of protection. Measured in defined time periods (30, 60, 90, 120 and 180 minutes) and in terms of Integrity and Insulation or Integrity only as designated by the European Standards.


Our extensive range starts with traditional and instantly recognisable, monolithic wired glass: easy to handle and stocked in both clear and textured. The range is complimented by the market leading 7.2mm Pyroguard: 3 ply and unwired, offering 30 minute integrity, rated to BS 476 part 20, plus the added benefit of radiation control. The range extends further to cover all aspects of fire resistance in glass, including fully insulated fire glass with performances of 30/30, 60/60, 90/90 , 120/120 and sealed units.


Fire testing has been carried out on all fire resistant products that Wholesale Glass produce, in UK test houses and other European countries. Certificates are available on request.


Typically used for:


Fire doors and fire screens, emergency exits.

Schools, hospitals, offices, commercial premises, industrial premises and transport infrastructure.

Any location where building regulations require a raised level of fire protection.

Fire resistant glass is available from Harrow Glass, as stock (wired only), or processed, in various types and thicknesses. 



Mirrored glass, mirror glass or silvered glass is a type of float glass, regular or tinted, manufactured with a silver and copper reflective coating on the back surface, then covered with one or two layers of protective paint. After processing, a backing is applied to improve impact safety and give added moisture protection.


Typically used for:


Gymnasiums, nightclubs, changing rooms, wardrobe doors.

Homes, commercial premises and leisure facilities.

Mirrored glass is available from Wholesale Glass, as stock, or processed, in various types and thicknesses including:


Regular silver mirror, bronze mirror, grey mirror, peach mirror, blue mirror and green mirror


4mm and 6mm.