Name: Security Glazing UK
Address: Unit 1 Hembs Crescent, Great Barr, Birmingham, B43 5DG, GB
Telephone: +448000886248
Price range: ££

Annealed glass: Ordinary float glass that has not been toughened or laminated. It breaks into large, sharp pieces, so it is not safety glass.
Anti-bandit glass: Laminated glass with several interlayers, tested to resist repeated hammer and axe attack, usually classed P6B to P8B under BS EN 356.
Anti-ram-raid glazing: Anti-bandit glass in a strengthened frame, designed to delay entry after a vehicle impact. It does not stop the vehicle; bollards or barriers do that.
Bead: The strip that holds a pane or sealed unit in its frame. Beads may be on the inside or outside of the window.
Blast-resistant glazing: Laminated glass tested to an explosion-pressure class such as BS EN 13541 (which classifies the glass), fitted in a frame and fixings designed for the blast load.
Bollard: A post set into the ground to stop or slow vehicles. Vehicle security bollards are tested to standards such as PAS 68 or ISO 22343.
BR class: A bullet-resistance class under BS EN 1063, from BR1 to BR7, with SG1 and SG2 for shotguns.
BS EN 12150: The European standard for thermally toughened safety glass.
BS EN 12600: The pendulum impact test that classes safety glass by how it withstands and breaks under human impact.
BS EN 13541: The test standard that classes glass by its resistance to explosion pressure, from ER1 to ER4.
BS EN 356: The test standard that classes glass by its resistance to manual attack, from P1A to P8B.
Critical location: A place where people are likely to walk or fall into glass, such as doors, side panels and low windows, where safety glass is required.
Deal tray: A recessed tray under a counter screen for passing cash, cards and documents across without a gap at hand height.
Desiccant: The drying agent inside the spacer bar of a sealed unit. Once it is saturated, the unit can mist between the panes.
Double-glazed unit: Two panes of glass sealed together around a spacer bar, also called a sealed unit or insulated glass unit.
Edge retention: Anchoring security film to the window frame so the whole filmed pane stays in place if the glass breaks.
ER class: An explosion-resistance class under BS EN 13541, from ER1 to ER4.
Externally beaded: A window whose glazing beads are on the outside, which can let a pane be removed from outside unless the beads are secured.
Glazing packer: A small plastic spacer that supports a pane or unit in the frame and keeps it square.
Heat-soak test: An extra treatment for toughened glass that reduces the risk of spontaneous breakage caused by nickel sulphide inclusions.
Heat-strengthened glass: Glass heat-treated to be about twice as strong as annealed glass. It breaks into larger pieces than toughened glass and is often used in laminates.
Interlayer: The plastic layer between the sheets of laminated glass that holds the pieces together when the glass breaks.
Internally beaded: A window whose glazing beads are on the inside, so the pane is much harder to remove from outside.
Ionoplast interlayer: A stiff interlayer, often known as SGP, used where laminated glass must keep carrying load after breaking.
Laminated glass: Two or more sheets of glass bonded with an interlayer. When broken, it cracks but stays in the frame.
Low-emissivity glass: Glass with a thin coating that reflects heat back into a room, used in energy-efficient sealed units.
LPS 1175: A Loss Prevention Certification Board standard for intruder-resistant building products, with ratings from A1 to H20 under Issue 8. Certification belongs to the product's manufacturer.
Manifestation: Markings applied to large areas of glass so people notice it and do not walk into it.
Misted unit: A sealed unit whose edge seal has failed, letting moisture condense between the panes. It needs replacing.
NS and S: Suffixes on bullet-resistance classes. NS means no splinters came off the protected side in the test; S means splinters may.
P1A to P8B: The BS EN 356 classes for resistance to manual attack: P1A to P5A from drop-ball tests, P6B to P8B from hammer and axe tests.
PAS 24: A UK test standard for the security of complete doorsets and windows, used for new homes under Approved Document Q.
PVB: Polyvinyl butyral, the most common interlayer in laminated glass. It also screens out most ultraviolet light.
Rebate: The recess in a frame that the glass or sealed unit sits in. Its depth limits how thick a new unit can be.
Retrofit: Fitting new glass, such as laminated units, into existing frames without replacing the windows.
Safety glass: Glass that breaks in a way unlikely to cause serious injury, usually toughened or laminated, tested to BS EN 12600.
Secondary glazing: A separate glazed panel fitted inside an existing window, often used in listed buildings to add security, warmth and quiet.
Secured by Design: The UK police crime prevention initiative. It lists member companies with certified products; we are not a member.
Security film: A clear polyester film applied to glass to hold the pieces together when it breaks and slow a smash-and-grab.
Spacer bar: The frame between the two panes of a sealed unit, which holds them apart and contains the desiccant.
Speech panel: A section of a counter screen that lets voices pass through while keeping the glass barrier intact.
Toughened glass: Glass heat-treated to be four to five times stronger than annealed glass, which breaks into small, blunt pieces. It cannot be cut after toughening.
Warm-edge spacer: A spacer bar made from less conductive material than aluminium, reducing heat loss and condensation at the edge of a unit.
Wired glass: Glass with a wire mesh inside. Ordinary wired glass is not safety glass unless it is marked as meeting a safety standard.

Security glazing glossary