Bostik P5125 Hot Melt sealant has been specially developed for the edge sealing of factory produced insulating glass units. Bostik P5125 is a single part 100% solids compound. When applied at the correct temperature it sets quickly from its molten state, allowing units to be moved from their assembly location within 5 minutes of application. Units can therefore be sealed and glazed within the same day, enabling fast and efficient response to customers' needs and requirements. Bostik P5125 demonstrates exceptional technical performance with only a single seal required.
Physical:
- Constitution: hot melt butyl rubber/polymer blend
- Colour: black
- Form: rubbery solid with a slightly tacky surface
- Specific Gravity: 1.15 to 1.19 g/cm3
- Moisture Vapour Transmition Rate: 0.1 g/m² per day for a 2mm film at 25°C, 100% (ASTM method E96)
- Adhesion: excellent adhesion to glass and aluminium spacer bar.
- Application Temperature Range: +180°C to +195°C ex nozzle.
- Flexibility: not brittle at -30°C.
- Water Absorbtion: less than 1% by weight at 25°C
- Argon Permeability : extremely low
- Solvant resistance: attacked by hydrocarbon based solvent e.g. White Spirit
Safety:
IMPORTANT: Before embarking on any work inlvoving Bostik P5125 Hot Melt sealant the Safety Data Sheet should be carefully studied by those carrying out the work. Gloves and eye protection are recommanded. For health and safety instruction, first aid measures and spillage and disposal instructions, see separate health and safety data sheet for Bostik P5125
Shelf life:
At least 2 years from date of manufacture when stored unopened in a cool, dry place within the temperature range +5°C to 25°C. Prevent damage to the sealant containers (drums in particulars) as denting may inhibit the function of application equipement.
Always ensure that the Hot Melt application equipement is properly maintained according to the manufacturer's instructions. The sealant temperature, ex nozzle, should be checked regularly (see Bostik P5125 User Guide) with a suitable, calibrated digital thermometer.
Surface preparation
Place the sealed unit in a horizontal position ensuring that the cavity width and depth dimensions conform to those recommended by Bostik (see Bostik P5125 User Guide). The cavity surfaces must be clean and dry and free from foreign matter. Coated glasses which require edge deleting must be used in accordance with manufacturer's instructions.
Application
Sealant application should be carried out at minimum workshop and glass temperature of not less than +15°C.
Unit life can be adversely affected by any of the following errors during manufacture, which should be avoided.
1. Reducing the sealant depth to below the recommended levels (see Bostik P5125 User Guide).
2. Application of the sealant outside of the recommended temperature range.
3. Incomplete filling of desiccant into the spacer tubes. (For units with cavities below 12mm Bostik recommend that all four sides of the spacer frame are filled with desiccant).
4. Dirty, wet or otherwise contaminated glass can reduce the adhesion of the sealant to the glass. This may allow moisture to pass into the unit cavity and cause early failure.
5. Reduction of the seal depth because of worn applicator sealing nozzle guide.
6. Gaps and holes left in the sealant such that it is not continuous without break around the entire unit.
The sealant should be applied by means of a suitable heated dispenser. lt is very important that the sealant is applied within the recommended temperature range, therefore it is advisable that the application temperature be checked (according to Bostik's recommended procedures) at the gun nozzle whilst gunning sealant into the machine hopper (see Bostik P5125 User Guide).
Further advice can be gained from Bostik's technical service department.
The sealant should be applied into the cavity of the unit in such a manner that complete wetting of the glass and spacer occurs. lf an internal locating nozzle is used, the nozzle should be checked regularly to avoid excessive wear in order to ensure that the correct seal depth is maintained. Care should be taken on sealing each corner to ensure that a complete seal is made around the corner and that holes and hairline cracks (cold joins) are excluded. Ensure that the corners are properly filled and squared off so that there are no shortages of sealant. lt is recommended that each corner should be pressed together (by means of proprietary silicone rubber pads) whilst still molten. lf units are to be stored on a rack, ensure that there is adequate support under both panes of glass.
Glazing method
Units manufatured with Bostik P5125 should be glazed in accordance with current GGF (Glass andd Glazing Federation) methods or other current GGF recognised and approved methods.
The use of adhesive tape is not recommended to cover the edge of the unit.
Before glazing, wooden frames should be allowed to dry completely after staining, preservative treatement or painting. Solvent should not be used to clean the unit.
Drained and ventilated systems should be used wherever possible otherwise approved and current fully bedded glazing methods are necessary.
If units are to be glazed into a glazing compound that is likely to be in contact with the edge seal of the unit, then it is important to ensure its compatibility with the P5125 sealant before glazing .
Further detailed information can be gained from the Bostik P5125 User Guide and Technical Bulletin from the Bostik Technical service department.
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Wood working
