Thermal GAP PAD Materials
Soft, fiberglass reinforced electrically insulating pad
A thermally conductive, silicone-based gap pad filler with a thermal conductivity rating of 3.5 W/m-K and ultra low modulus (ULM).
All marks used are trademarks and/or registered trademarks of Henkel and its affiliates in the US, Germany, and elsewhere.
- Description
- Technical specification
BERGQUIST® GAP PAD TGP 3500ULM is an extremely soft thermal interface material with a higher natural tack, eliminating the need for additional adhesive layers and providing stick-in-place characteristics during assembly. The specially designed formulation offers excellent thermal performance at low pressures and is highly conforming, allowing for excellent wet-out at the interface.
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Thermal conductivity: 3.5 W/m-K (ASTM D5470)
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Fiberglass reinforced for puncture, shear, and tear resistance
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High-compliance, low compression stress
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Non-fiberglass option available for additional stress reduction
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Supplied with protective liners for ease of use
- Product category:
- Thermal GAP PAD Materials
Technologies:
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Thermal management, gap pads
- Carrier type:
- Fiberglass,Non-fiberglass
- Color:
- Gray
- Flame rating:
- V-0
- Operating temperature:
- -60.0 °C - 200.0 °C
- Standard thickness:
- 0.508 mm - 3.175 mm
- Thermal conductivity:
- 3.5 W/mK
- Young's modulus:
- 27.5 KPa (4.0 psi)
FAQ
Depending on the surface being applied to, if care is taken, the pad may be repositioned. Special care should be taken when removing the pad from aluminum or anodized surfaces to avoid tearing or delamination.
A test fixture is utilized that meets the specifications outlined in ASTM D5470.
The characteristic of the rubber itself has a natural inherent tack, with the addition of an adhesive. As with adhesivebacked products, the surfaces with natural tack may help in the assembly process to temporarily hold the pad in place while the application is being assembled. Unlike adhesivebacked products, inherent tack does not have a thermal penalty since the rubber itself has the tack. Tack strength varies from one GAP PAD product to the next.
Depending on the material that the pad is applied to, in most cases they are repositionable. Care should be taken when removing the pad from aluminum or anodized surfaces to avoid tearing or delaminating the pad. The side with the natural tack is always easier to reposition than an adhesive side.
Currently, BERGQUIST® GAP PAD TGP 800VO, BERGQUIST® GAP PAD TGP 800VOS, and BERGQUIST® GAP PAD TGP 1000VOUS are offered with or without an adhesive and on the carrier-side of BERGQUIST® SIL PAD TSP 1600 and BERGQUIST® SIL PAD TSP 900. The remaining surface has natural inherent tack. All other GAP PAD materials have inherent tack.
From -60°C to 200°C, there is no significant variance in hardness for silicone GAP PAD materials and Gap Fillers.
Depending on the application and the pad being used, GAP PAD has been reworked in the past. Some of our customers are currently using the same pad for reassembling their applications after burn-in processes and after fieldwork repairs. However, this is left up to the design engineer’s judgment as to whether or not the GAP PAD will withstand reuse.
Shelf life for most GAP PAD materials is one (1) year after the date of manufacture. For GAP PAD with adhesive, the shelf life is six (6) months from the date of manufacture. After these dates, inherent tack and adhesive properties should be recharacterized. The GAP PAD material’s long-term stability is not the limiter on the shelf life; it is related to the adhesion or “age up” of the GAP PAD to the liner. Or in the case of a GAP PAD with adhesive, the shelf life is determined by how the adhesive ages up to the removable liner.
Yes, all GAP PAD materials are electrically isolating. However, keep in mind that GAP PAD is designed to fill gaps and it is not recommended for applications where high mounting pressure is exerted on the GAP PAD.
GAP PAD in general can be exposed to temporary processing temperatures of 250°C for five minutes and 300°C for one minute.
The thickness tolerance is ±10% on materials greater than 10 mils and ±1 mil on materials less than 10 mils thick
The better a GAP PAD lays smooth, “wets out” or conforms to a rough or stepped surface, the less interfacial resistance caused by air voids and air gaps. GAP PAD materials are conformable or compliant, as they adhere very well to the surface. The GAP PAD materials can act similarly to a suction cup on the surface. This leads to a lower overall thermal resistance of the pad between the two interfaces.
Silicone GAP PAD and Gap Fillers, like all soft silicone materials, can extract low molecular weight silicone. Also note that GAP PAD and Gap Filler have some of the lowest extraction values for silicone-based gap filling products on the market, and if your application requires minimal silicone, see our line of silicone-free material. Primarily for aerospace applications, outgassing data is tested per ASTM E595.
A reinforcement carrier is generally used in BERGQUIST® GAP PAD materials for ease of handling. When testing hardness, the reinforcement carrier can alter the test results and incorrectly depict thinner materials as being harder. To eliminate this error, a 250-mil rubber puck is molded with no reinforcement carrier. The puck is then tested for hardness. The Shore hardness is recorded after a 30-second delay.
