iFixit Silicone Work Mat vs Silicone Mat Mold Greek Key Relief: which is safer?
iFixit Silicone Work Mat is our pick: better on PFAS and on the overall hazard picture.
Our pick
Pyrex
iFixit Silicone Work Mat
PFAS grade
D 65/100
Overall grade
F 59/100
Verdict
Skip
Hazard flags
⚑ 1
Material
silicone (elastomer)
Confidence
78%
PossibleMicroplastic or particle shedding
Silikomart
Silicone Mat Mold Greek Key Relief
PFAS grade
D 65/100
Overall grade
F 57/100
Verdict
Skip
Hazard flags
⚑ 2
Material
Silicone mold, no nonstick coating needed
Confidence
82%
PossibleCoating degradation and flaking
PossibleMigration of uncrosslinked oligomers from silicone
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More silicone cutting & prep boards: see the full ranking