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.
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MSS-A85BQ
Data Sheet
This high-performance quasi-polyester system is one of a family of polymer systems developed by Northstar Polymers for demanding work environments. Urethane elastomers molded with this system exhibit high tear strength, high tensile elongation, excellent oil resistance, and outstanding abrasion resistance. They also meet the requirements of 21 CFR 177.1680, FDA direct dry food contact. This combination of features makes elastomers molded from MSS-A85BQ perfect for many applications including the handling of wood chips, grain, sand, gravel and other commodities, mining, and many custom applications. For long-term use in constant aqueous environments, consider a system from our polyether or hybrid product families.
Typical Physical Properties
Physical Property
ASTM #
Typical Value
Durometer Hardness:
D 2240
Shore A 85
Modulus (psi):
100% Elongation:
D 412
1235
300% Elongation:
D 412
2910
Tensile Strength (psi):
D 412
6200
Ultimate Elongation (%):
D 412
800
Tear Resistance (pli)
Die C:
D 624
720
Split:
D 624
475
Taber Abrasion (mg loss):
D 4060
30
Bashore Rebound (%):
D 2632
38
Prepolymer:
MSA-018
Curing Agent:
SBA-030
Catalyst Type:
Amine
Catalyst Level:
Included
Prepolymer Temperature (ºF):
70
Curing Agent Temperature (ºF):
180
Mold Temperature (ºF):
180
Pot Life* (minutes):
2-1/2 to 3
Gel Time** (minutes):
4
De-mold Time*** 180 °F (minutes):
30 - 40
Complete Cure Cycle*** 180 °F post-cure (hours):
16 - 24
* Defined as: a 300 gram sample is too thick to pour.
** Defined as: no string of urethane develops when touched.
*** The use of catalyst will increase the rate of cure, but will decrease Pot Life.
Typical Mixing Ratio
Prepolymer (A) Curing Agent (B)
Code Number: MSA-018 SBA-030
Specific Gravity: 1.204 1.144
Equivalent Weight: 183 299
Stoichiometry: 1.00 1.00
NCO/OH Index: 1.00 1.00
Weight Pph: 37.9 62.1
Weight Ratio: 1.000 1.636
Weight Ratio: 0.611 1.000
Volume Pph: 36.7 63.3
Volume Ratio: 1.000 1.722
Volume Ratio: 0.581 1.000
The actual mixing ratio at the operation may need to be adjusted based on the actual stoichiometric ratio calculation. For machine mixing, calibration of the mixing ratio is recommended before the new batch of raw material is used.
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.