Gel-Pak Tack Level (Retention) Chart
Gel-Pak has refined its elastomer chemistry to provide a wide range of tack (retention) levels from an extremely low tack Gel or Vertec elastomer for holding small polished optics to a high tack Gel or Vertec elastomer for holding large ceramic substrates.
Label | Retention Level | Description | Products | ||||||
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AD | BD | CD | VR | PF | WF | DGL | |||
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XT | Ultra Low Tack Gel | ![]() |
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XL | Low Tack Gel | ![]() |
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X0 | Low Tack Gel | ![]() |
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X4 | Medium Tack Gel | ![]() |
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X5 | Medium Tack Gel | ![]() |
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X6 | High Tack Gel | ![]() |
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X8 | High Tack Gel | ![]() |
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FP64 | Low Tack Vertec | ![]() |
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FM71 | Medium Tack Vertec | ![]() |
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FE70 | Medium Tack ESD Vertec | ![]() |
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EH02 | Low Tack ESD Vertec | ![]() |
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EH07 | High Tack ESD Vertec | ![]() |
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FK79 | High Tack Vertec | ![]() |
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EH06 | ESD Vertec | ![]() |
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Label

Retention Level
XT
Description
Ultra Low Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
XL
Description
Low Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
X0
Description
Low Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
X4
Description
Medium Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
X5
Description
Medium Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
X6
Description
High Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
X8
Description
High Tack Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
ER0
Description
Low Tack ESD Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
ER4
Description
Medium Tack ESD Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
ER6
Description
Medium Tack ESD Gel
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl
Label

Retention Level
ER8
Description
High Tack ESD
Products
- ad
- bd
- cd
- vr
- pf
- wf
- dgl