MPP-A60A
MPP-A60A
Northstar Polymers, LLC
3444 Dight Avenue So.
Minneapolis, MN 55406
Tel: 612.721.2911
Fax: 612.721.1009
E-Mail:
Northstar Polymers, LLC is a member of Polyurethane Manufacturers Association.
Copy right reserved by Northstar Polymers, LLC 2000 - 2007. Northstar Polymer prohibits duplication of the contents of this web site for the purposes of public display and/or using on another web site without a written authorization by Northstar Polymers, LLC.
MPP-A60A
Data Sheet
MPP-A60A is one of our room-temperature-cure liquid castable polyurethane systems. This ether-base polyurethane system is used in applications such as mold-making, prototyping, production of cast parts, potting, tool-making, and many other applications. MPP-A60A is designed for an easy operation for industrial applications without special casting or heating equipment. Its low viscosity also makes it easy to achieve replicating the details of the mold/original with a fine resolution. Urethane elastomer parts made of this system exhibit:
q Fine resolution of mold details
q Good cut/tear resistance for its class
q Good performance in wet environments
q Easy-to-use room-temperature-curable
q Small shrinkage factor
The suitable applications of MPP-A60A include stamps/patterns and molds designed to transfer a decorative image to wet surfaces as well as a potting compound for electronic applications where low viscosity liquid resin is required to encapsulate small wires and components. It is also suitable for many other custom applications where flexibility and strength of the parts are required.
Typical Physical Properties
Physical Property
ASTM #
Typical Value
Durometer Hardness:
D 2240
A55-60
Tensile Strength (psi):
D 412
366 psi
Ultimate Elongation (%):
D 412
157%
Tear Resistance (pli)
Die C:
D 624
118 pli
Split:
D 624
14 pli
Bashore Rebound (%):
D2632
40%
Typical Processing Conditions
Prepolymer:
MPN-023
Curing Agent:
PBA-055
Catalyst:
Included
Prepolymer Temperature (ºF):
Room Temperature**
Curing Agent Temperature (ºF):
Room Temperature**
Mold Temperature (ºF):
Room Temperature**
Pot Life*(minutes):
10 - 15
De-mold Time*** at 77ºF (hours):
4 - 6
Complete Cure Cycle*** at 77 °F (days):
4
* Defined as: a 300 gram sample is too thick to pour.
** Between 70 ºF and 90 ºF. Higher temperature results faster curing pattern
*** The use of catalyst or higher mold temperature will increase the rate of cure. Mold may needed to be heated to 100 - 120 ºF for casting a very thin layer and/or using a heat-absorbing material for mold or inserts.
Typical Mixing Ratio
Prepolymer (A) Curing Agent (B)
Code Number: MPN-023 PBA-055
Specific Gravity: 1.173 1.024
Equivalent Weight: 226 546
Stoichiometry: 1.000 0.987
NCO/OH Index: 1.013 1.00
Weight Ratio: 1.000 2.300
Volume Ratio: 1.000 2.636
The actual mixing ratio at the operation may need to be adjusted based on the actual stoichiometric ratio calculation. For machine mixing, the mixing ratio calibration is recommended before the new batch of raw material is used.
By adjusting the mixing ratio in a small range, you can yield a range of hardness between about 50 A to 60 A Durometer using the same combination of the part-A/B component materials. The following chart is reference only. The surface of the cured material becomes more sticky as you increase part-B ratio. By adjusting the mixing ratio the overall physical properties, not limited to the hardness, of the cured material change.
Part-A: Part-B Approximate Cured Hardness
1.00 : 2.38 60 A
1.00 : 2.45 56 A
1.00 : 2.55 52 A
(The above ratios are by weight.)
Northstar Polymers, LLC
3444 Dight Avenue South
Minneapolis, MN 55406
Tel: 612.721.2911
Fax: 612.721.1009
E-Mail: info@northstarpolymers.com
Notice: All of the statements, recommendations, suggestions, and data concerning the subject material are based on our laboratory results, and although we believe the same to be reliable, we expressly do not represent, warrant, or guarantee the accuracy, completeness, or reliability of same, or the material or the results to be obtained from the use thereof, neither do we warrant that any such use, either alone or in combination with other materials, shall be free of the rightful claim of any third party by way of INFRINGEMENT or the like, and NORTHSTAR POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE.