8 октября, 2015 
Pokraskin DAP is the most commonly used of the allylic esters, which are a branch of the polyester family.
These thermoset products are typically selected for outstanding dimensional stability, ease of moulding and excellent electrical properties.
DAP can be bonded with most engineering adhesives and good strengths [3] are achieved for many different adhesive technologies (Table 3.1).
The cyanoacrylates (without primer) showed excellent results in these trials (Table 3.1) but DAP are often used in moist environments and so care must be taken if selecting a cyanoacrylate as a structural adhesive.
|
Table 3.1 Adhesive shear strengths |
DAP) |
|
|
Adhesive type |
Description |
Shear strength (N/mm2) |
|
Cyanoacrylate |
Standard ethyl |
>21.7* |
|
Toughened |
>13.5* |
|
|
Ethyl + primer |
1.0 |
|
|
Two-part acrylic |
MMA |
5.2 |
|
Polyolefin bonder |
4.1 |
|
|
Epoxy |
‘5-minute’ epoxy |
3.1 |
|
Standard epoxy |
12.0 |
|
|
Silicone |
Alkoxy silicone |
1.4 |
|
UV acrylic |
Visible light cure |
2.4 |
|
Notes: * Substrate failure All shear strengths are given as guidelines only and may vary considerably depending on grade of plastic, fillers, surface finish, etc. Recycling information = thermoset |
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