Flush mounting technology for laminated glass

The processing of laminated safety glass presents a great challenge to fastening technology, at least in the case of frameless systems.

If, instead of a 8 mm tempered- a laminated 8/2 glass panel made of 2×4 mm tempered glass is used, compressive load, gravity etc. acts upon each one 4 mm tempered glass panel, which is correspondingly less resilient than an 8 mm panel. One of the reasons why the new EN 14428 for shower enclosures is only permitted without drilling.

Conventional fittings are attached by pressure from both sides. In the case of laminated glass this creates a “crushing” of the PVB or EVA composite in the fitting area. This compound reacts similar to rubber, it “works” against it. In addition, there are shear and oscillation movements in the fitting area, so air, moisture or chemicals penetrate into the composite and cause delamination.

Conventional fittings work with through-holes. However, this is not only undesirable in the case of shower cubicles, since flushness is preferred and the use of countersunk screws is less possible in the case of laminated glass, as well as water can pass through the holes and lead to leakage or a boost of the delamination process. Even greater problems arise when fixing insulating glass. Conventionally, the gas filled glass must be produced with gas-tightly protected inner tubes in the bore area, so that the fastening elements can be guided through the tubes. However, a later leakage of the gas can hardly be excluded.

The patented PR Backplate Technology for fastening brackets and fittings is an innovative solution.

  1. In the production of laminated safety glass, only one of the two tempered glass panels is drilled through. A strengthening made of stainless steel is laminated in the area of this hole. The plate has a threaded stud which is wielded through the bore so that the drill hole edges are not touched. This results in the load transfer from the panel to the middle of the glass in composite- the drill hole is not loaded at all. Due to the correct bonding even significantly higher weights can be calculated than with conventional sandwich clamping.
  2. Even if, for example, a through hole is desired in the interior door area, there is an appropriate solution. The stainless steel plate is endowed with two pins, one on each side, which as well do not touch the edges of the bore and remove the load in the center of the panel. Even more important: The stainless steel plate is manufactured in such way that it is as thick as the PVB or EVA foil, which means that the laminated glass can no longer be “squeezed” in the fitting area- you would have to crush the stainless steel.
  3. The production of insulating glass elements is therefore possible without through holes: no
    gas leak no more! And no more needlework with small pipes that have to be glued in some
    way. Standard processing in glass production as well as in transport is possible since the pins
    are flush with the glass.
  4. Flexibility: The backplates can be manufactured in different shapes and sizes depending on
    the thickness of the composite and the shape of the fitting and the required load transfer.
  5. Aesthetics: Especially with flush panels you look from the flush side on the countersunk
    screws and through the glass on dingy rubber inserts. Countersunk screws can be still be so
    perfect- the glass is never perfectly flush.
    Different with the backplate: On the flush side is only glass and you look at the stainless steel
    plate, which has precisely the shape of the fitting. Clean design in best two-fold meaning.

The patented PR Backplate Technology for fastening brackets and fittings is an innovative solution

  • To avoid damage to laminated safety glass
  • For solid fastening of heavy loads
  • For the manufacturing of a one sided, absolutely flush, as well as water and gas impermeable surface
  • Laminated glass made of tempered glass with through holes to prevent delamination

Backpoint I

ESG
PVB
ESG

Backpoint II

Backpoint Iso

Fastening technology
for composite/insulating glass