Dyplast recently released two extensive Technical Bulletins on comparisons between elastomeric and polyisocyanurate insulants in refrigeration and process applications (Technical Bulletins 0520 and 0620, respectively), since there are some differences.
Now we are releasing our condensed Qwik Guide 0620 (1-page plus an R-value table) that summarizes both. Our Qwik Guide may be useful in conversations among insulation contractors, engineers, fabricators, and owners where a 1-page summary conveys major points quickly.
While this Qwik Guide and the Technical Bulletins each embed more findings and detail, the following is a brief conclusion:
- Since elastomeric insulation is more expensive and has 30-47% poorer thermal conductivity when compared to polyiso, the essential question is “why use it?”
- R-value tables offered by some elastomeric suppliers are adjusted to consider cylindrical geometry; polyiso when similarly adjusted always has better R-values.
- Elastomeric insulants vary greatly in their chemistry.
- Polyiso has Leachable Chloride Content comparable to elastomeric, and thus the claims that elastomerics do not contribute to Chloride Stress Corrosion can be problematic.
Click here for our Qwik Guide comparing polyiso and elastomeric.