TEST ELECTRONICS’ WAVE SOLDER PALLETS
Precision Machined High Temperature Pallets for
Pick & Place and Wave Solder
Carrier Pallets
High Strength, high temperature, semiconductive composite board designed for
use as circuit board and flex circuit carrying pallets for solder reflow ovens.
| Pallet Features » High strength to withstand operator abuse and repeated use without damage. » High temperature compatibility allowing frequent cycles through wave soldering without warping or delamination » Dimensional stability so that fit and alignment are the same time after time. » Chemical resistance which provides long pallet life even through rigorous cleaning processes. » Consistent conductivity on the surface and through the sheet to preserve sensitive components. » Low heat absorption allowing the machines to run cooler and faster. » Special pin fabrication and insertion techniques prevent loosening of circuit board alignment pins. » White lettering provides easy to read part number labeling. |
Standard Machining and Static
Protection
The pallet material is impregnated with a conductive carbon which acts to
prevent static damage. Standard machining techniques can loosen and wash this protective
carbon away from the surface areas where it is most needed. Test Electronics prevents this
by using a high speed spindle speed of 30,000 rpm. This high speed promotes cleaner
cutting of the fibers and minimizes breaking up and washing away the conductive carbon
composite material. After the machining process, the pallet is then micro bead polished to
a gloss ensuring that the fibers and carbon are blended smoothly at the surface for
optimum static protection.
Lower heat Absorption
Special machining and polishing techniques which enhance the surface conductivity also
allows the use of lower carbon content pallet material. This lightens the color and
reduces heat absorption allowing the reflow soldering machines to run cooler and faster.
| Machining Specifications | |
| Pinning accuracy | +/- 0.0005" |
| Cut accuracy | +/- 0.001" |
| Surface roughness | ANSI-16 or better |
Tooling Pin Insertion Base Styles
Tooling pins are installed using an automated machine for positioning, and
insertion. This technique provides perpendicularly exceeding 1/1000" per linear foot,
and prevents drift due to side scoring and chipping. The end result is an extremely high
degree of accuracy and repeatability in pin positioning. Above all, a tighter press fit
for better mechanical reliability.
Other techniques for even higher reliability are as shown above:
» Swaged pins.
» Grove and glued pins (high temperature
epoxy)..
» Cap captured pins.
Tooling Pin Body Styles
A variety of pin body styles are available. The styles are listed from the lower
cost to the most expensive. The tradeoff is pin placement longevity. The stainless steel
pins expand and contract at different rates than the pallet material, and can loosen up
over time. The flanged step pin holds the best but costs the most. Common pin styles
available are:
» Straight pins
» Step pins
» Flanged Step Pins.
Tooling Pin Tip Styles
» Round head for standard through holes
» Diamond head for slotted holes
» Elongated round head for precision
aligning slotted holes
Materials
Pallet carrier materials are available in three grades to meet your needs. All grades are
lightweight, and offer advantages over aluminum, titanium and other composite materials.
Dimensional stability, flatness, thermal shock resistance and chemical resistance make
these products ideal for the hostile environments presented in wave solder applications.
Material Selection
We offer the industry's widest variety of pallet.
» No Carbon is non-conductive
» High Carbon is semi-conductive
» Low Carbon is both semi-conductive and
optically reflective.
Quality
All versions of the Pallet materials are closely checked for warp, twist, surface
resistivity and other key properties prior to being micro-sanded to the tightest tolerance
control available.
| Material Specifications | No Carbon |
High Carbon |
Low Carbon |
| Density | 1.75 |
1.75 |
1.84 |
| Water Absorption (%) | < 0.2 |
< 0.2 |
< 0.2 |
| Avg. CTE (para) K-1 | 7.1x10-6 |
7.1x10-6 |
7.1x10-6 |
| Avg. CTE (perp) K-1 | 20.5x10-6 |
20.5x10-6 |
20.5x10-6 |
| Flexural Strength (psi) | 55,000 |
55,000 |
45,000 |
| Modulus in Flexure (psi) | 2.8 |
2.8 |
2.8 |
| Izod Impact Strength (ft. lbs.-/in.) | 15 |
15 |
15 |
| Thermal Conductivity (btu/hr/ft2/in/°F) | 2 |
2 |
2 |
| Surface Resistivity (ohms/square) | 1014 |
105-109 |
105-109 |
| Surface Operating Temperatures | 300°C |
300°C |
300°C |
| Chemical Resistance | Very Good |
Very Good |
Very Good |
| Color | Deep Blue |
Black |
Light Gray |
| ESD Safe | No |
Yes |
Yes |
| Barcol Hardness | 65 |
65 |
65 |
Delivery:
5 Prototype units one week
50 units per week after prototype approval
100 units per week ramp up after first 100 units.
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