Technical Data Sheet (TDS)

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Bostik 2000

Polyisobutylene hot melt primary sealant

Uses

Bostik 2000 Primary Sealant is a compounded polyisobutylene hot melt sealant specifically formulated for use in the production of dual seal insulating glass units. lt should always be used in conjunction with a suitable secondary seal, such as our Polysulfide Sealant; the resulting sealed units are then capable of complying with the test requirements laid down in EN 1279 Parts 2 and 3.

Benefits

  • Excellent adhesion to glass, aluminium, galvanised steel and metal and plastic corner keys
  • Very low moisture vapour transmission rate
  • Very low gas permeability
  • Acts as a thermal break
  • Easy application by standard dispensing equipment
  • No cleaning or purging of dispensing equipment required
  • Can also be used as a spacer bar adhesive

Properties

Physical:

  • Constitution: compounded polyisobuthylene rubber containing no volatile materials
  • Colour: black
  • Form: rubbery solid


 Typical Performance Data (approx.)

  • Recommended Application Temperature: 120°C – 150°C or sufficient to produce a consistent even coating
  • Recommended Coat Weight: 2-4 g per linear metre on both sides of the spacer bar for our polysulfide sealant depending upon spacer profile. lf using with hot melt butyl please contact Bostik Technical Services.
  • Moisture Vapour Transmission Rate:  <0.1 g/m² per day for a 2mm film at 25°C 100% RH. (ASTM method E96)    

Safety:

IMPORTANT: Before embarking on any work involving Bostik 2000 the Safety Data sheet should be carefully studied by those carrying out the work. Gloves and eye protection are recommended. For health and safety instruction, first aid measures and spillage and disposal instructions, see separate health and safety data sheet for Bostik 2000.

Shelf life:

At least 12 months from date of manufacture when stored unopened in a cool, dry place within the temperature range +5°C to +25°C.

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Application

Unit Preparation
Bostik 2000 exhibits excellent adhesion to cut, ground or polished glass and aluminium and galvanised steel spacer bar. It is essential that all surfaces are clean and dry.

Typical Application when using Bostik 2000 secondary seal
 
Bostik 2000 is suitable for use on all types of primary seal application equipment. Due to inherent minor differences between machinery, optimum performance is best attained by assessing the coating weight per linear metre on each side of the spacer bar rather than by specific temperature and pressure settings. The coating weight should be within 2 to 4 g per linear metre on each side with the front and back coating weight as close to each other as possible (no greater than 0.5 g difference).
 
The spacer bar profile also determines the optimum coating weight achievable. A straight sided spacer bar will require a lower coating weight (2 to 3 g/m) than a spacer bar specifically designed for dual seal systems. This type of spacer can accommodate a higher coating weight.
 
 
For use with our polysulfide sealant the coating weight is below 2 g/m then incomplete wetting of the glass can result and minor coating imperfections will be exacerbated. If the coating weight is above 4 g/m then not only could an excess of primary seal exude into the unit cavity, but also the degree of pressing out could be adversely affected leading to inadequate adhesion and/or excessive unit thickness.
 

It is important that a continuous, even coating is achieved and that any excess primary seal is pushed into the gap where the corner key locates into the spacer. A complete primary seal of the unit is only attained when corner keys are plugged or a bent spacer bar system used. Avoid touching the extruded primary seal as this may adversely affect the wetting out and adhesion of the compressed primary seal. Further advice on particular aspects of application or the use of Bostik 2000 with Bostik hot melts can be obtained from our Technical Service Department.   

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Packaging

Presentation Bar code Bostik code
box - 2.5 kg 922426
box - 7 kg 922419

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