Technical Data Sheet
QM 280
Quantum Silicones鈥? 80 Durometer Addition Cure
Moldmaking Material
Product Description
Quantum Silicones鈥? QM 280 is a two component, room temperature addition cure
silicone material. The cured rubber has excellent mechanical properties and good
shelf-life stability. This material is a good choice for the molding of furniture, picture
frames and architectural materials. QM 280 also has very strong physical properties and
resin resistance. In addition, this material is exceptionally good where high durometer
and dimensional stability are required.
Key Features
High Durometer
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Casting resin resistance
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Fast demold time
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Excellent dimensional stability
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Main Applications
Molds for architectural replication
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Molds for polyester, epoxy resin casting, and rigid or foam polyurethane casting
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Molds for technical articles and prototypes
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Molds for furniture and picture frame replication
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High durometer silicone roll applications
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Typical Properties
UNCATALYZED PROPERTIES
Mix Ratio 10:1 by weight
BASE QM 280A
Base Appearance Beige
Base Viscosity, cps 160,000
Base Specific Gravity, g/cm2 1.50
CATALYST QM 280B
Catalyst Appearance Clear
Catalyst Viscosity, cps 1,000
Catalyst Specific Gravity, g/cm2 1.02
Typical Properties Continued
CATALYZED PROPERTIES: QM 280
PROPERTY QM 280A
Catalyzed Color Beige
Catalyzed Viscosity, cps 90,000
Pot Life(1)(minutes) >55 minutes
Demold Time(hours) 8 to 12 hours
TYPICAL CURED PROPERTIES (3 DAYS @ 25C)
Durometer, Shore A 80 (heated)
Tensile Strength, psi 1100
Elongation, % 75
Tear B, ppi 75
Linear Shrinkage, % <0.1
Useful Temperature Range -60C to 204C
(1)Pot Life is defined as time to gel.
Cure Characteristics
The curing process begins as soon as the catalyst is mixed with the base.
Under normal temperature (25C) and humidity (50% RH) conditions, the material will
cure as described in the data above. Because this system is sensitive to heat and humidity,
a change in cure speed may be seen if one or both of these variables are altered. Any
large difference in temperature (+/-5C) or humidity (>60-70%) may change the cure
profile of the material. In addition, if the product is to be used with aggressive resins such
as high styrene polyester resins, it is recommended that the rubber be allowed to cure for
48 hours. For best results, QM 280A and QM 280B components of the same lot number
should be used.
Mixing and De-aeration
The following procedure should be followed for obtaining optimal performance
from QM 280:
Charge 100 parts, by weight, of QM 280A and 10 parts, by weight, of QM 280B
into a clean, compatible metal or plastic container. Shake the catalyst well before use.
The volume of the container should be 3-4 times the volume of the material to be mixed.
This allows for expansion of the siloxane material as it de-gasses.
Mix thoroughly by hand or with mixing equipment while minimizing air
entrapment until a homogeneous mixture is obtained. This will occur when the material
takes on a uniform color with no visible striations. Once mixing * is complete it is
recommended that the material be de-aired 2-3 times by intermittent evacuation for a few
minutes to minimize any imperfections due to bubbles in the cured material. Typically
after releasing the vacuum 2-3 times the mass will collapse on itself at which time the
vacuum should be left on only 2-4 minutes longer.
* Machine mixed material does not normally need to be de-aired.
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Shelf-life and Storage
QM 280A and QM 280B should be stored in their original, sealed containers in an
environment that does not exceed 90F. Under these conditions the expected shelf-life of
the material is 12 months.
Not for Product Specification
The technical data listed herein is provided as a reference only and is not intended
as sales specifications. For sales and technical assistance or for product
recommendations, please call 1-800-852-3147.
Quantum Silicones
8021 Reycan Rd
Richmond, VA 23237
Phone (804) 271-9010 Fax (804) 271-9055
Customer Service (800)852-3147
www.quantumsilicones.com
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