| Rubber chemicals featured include accelerators and activators, antioxidants, antiozonants and protective agents, peptizers, retarders, coagents, peroxides and carbon blacks. |
| Contractors are also encouraged to use evaporation retarders when weather conditions could cause excessive water evaporation from the slab. |
| The subject of vapor barriers or retarders beneath concrete slabs on grade has long been controversial. |
| Retarders based on salicylic acid or phthalic anhydride were used but in general, they were not particularly effective at increasing the scorch delay of sulfenamides. |
| Table 1 lets you compare the permeance of some of the vapor retarders used in buildings. |
| The literature is full of other, more complicated ways to measure optical anisotropy, usually using a combination of polarizers and retarders. |
