Unique Chemistry
What is Polyisobutene (PIB)?
Chemical Structure:
Polyisobutene (PIB), is an un-aging, high-performance, self-bonding sealant that remains extremely flexible and permanently self-sealing, even at low service temperatures.
- Covalent bonds only
- No sensitive chemical groups, just Carbon and Hydrogen
- No possibility to crosslink the polymer chain
- Contains NO ISOPRENE
Pure polymer of isobutene: The polymer chains are ≅100% isobutene. No crosslinking.
Quantitative Attributes:
- Remains fluid with low glass transition temperature of -88.6°F:
- Dielectric strength (breakdown voltage): 20 kV/mm
- Temperature ranges
- Thermal resistance: +194 °F
- Continuous buried and submerged services: -49 to +248 °F
- Specific electrical insulation resistance
- Rs100 > 108 (1E+08) Ω.m² [> 109 (1E+09) Ω.ft²]
- Cathodic disbondment resistance
- Tested @ +23 °C [+73 °F] and @ +95 °C [+203 °F]
- -Disbondment 0 mm, no holiday. Defect Ø 6 mm [1/4”] self-healed within 24 hours.
Qualitative Attributes:
PIB does not sustain a flame; chars with no smoke toxicity; and is graded as non-combustible
PIB has no crosslinking with isoprene, therefore the material never cures and remains inert despite weatherization or exposure
PIB has ongoing self-healing properties because the lack of crosslinking results in true cold flow properties
PIB is a UV stable compound that is not degraded from prolonged exposure to UV