TECHNICAL DATA
#528 Contact Lens Pitch Dozen
PZ0528

#528 CONTACT LENS PITCH is a formulated pitch, used as an industry standard for blocking of contact lenses, to provide high tensile strength with easy removal.

Application

Depending on application, #528 CONTACT LENS PITCH can be applied in two basic methods:

  1. Pre-melt #528 CONTACT LENS 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.

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

Benefits
  • Excellent tensile strength
  • Easy removal
Physical Characteristics
Test #528 Contact Lens Pitch Dozen
Appearance Black Solid Stick
Softening Point (°C) 54 ± 3
Melting Point (°C) 72 ± 3
Ball Penetration Test (70F, 500 g weight, 1hr) (in) 0.011 ± 0.005
Availability
  • 1 Dozen Stick(s)
Information included herein was obtained from sources which UNIVERSAL PHOTONICS, INC. and its subsidiaries believes are reliable and accurate as of the date hereof. However, no representations or warranties, either expressed or implied, of merchantability, fitness for a particular purpose or of any other nature are made herein as to the information provided or the product to which the information refers. The health and safety precautions contained herein may not be adequate for all individuals and/or situations. It is the user's obligation to evaluate and use this product safely and to comply with all applicable laws and regulations. Given the variety of factors that can affect the use and application of a product, some of which are uniquely within the user's knowledge and control, it is essential that the user evaluate the product to determine whether it is fit for a particular purpose and suitable for user's method of use or application. We assume no legal liability for any injury, accident, loss, or damage through the use of this product. ver.12.20.2022/TD