Description

#8 BLACK PITCH is a semi-hard temporary cement used for a variety of blocking applications. #8 BLACK PITCH is commonly used for blocking together a series of lenses or work pieces that need to be edged or profiled. Other applications include Blanchard wheel work, spot blocking, surface protection, and a variety of uses where semi-hard, high tack materials are desired.

Application

Depending on application, #8 BLACK PITCH can be applied in two basic methods:

1. Pre-melt #8 BLACK PITCH in a controlled heating vessel, and apply or pour molten pitch to blocking plate or lap, and then mount the workpiece.
2. Pre-heat the blocking plate or lap and work piece, and wipe the pitch across the heated tool and mount the workpiece.

#8 BLACK PITCH can be removed from the parts by using UNICLEAR or UNICLEAR II. For best results, please consult with UPI technical staff to recommend optimal processing conditions.

Benefits

• Unaffected by water and coolant
• High dielectric constant
• Lack of porosity
• Works well with diamond tooling

Physical Characteristics

• Appearance: Solid Black
• Softening Point (°C): 52 ± 4
• Melting Point (°C): 68 ± 4
• Ball Penetration Test (70F, 500 g weight, 1hr) (in): 0.0020 ± 0.0010

Availability

Additional Product IDs

PB0080, PB0080NS