SMART CHEMISTRY
With CHARACTER.
QM 2125
2 part moldmaking material
Description Property Test Method Value
QM 2125 is a two-component, room temperature, condensation Uncured Product
cure, silicone material. The cured rubber has excellent 3 days, 25 C, 50%
mechanical properties and good shelf-life stability. This material _ Cure Profile humidity
is an excellent choice for the molding of intricate patterns, skin .
molding and applications where high durometer, dimensional Cure Type Condensation
stability and extremely tough rubber are required. A variety of Density A BS1SO2781 1.16
catalysts are offered with this material. Density B BS ISO 2781 1.00
Key Features Mix Ratio By Weight 10:1
* Low specitic gravity Rheology Liquid
* High tear strength Tack Free Time / Skin
* Low viscosity and long work life ; Formation at 23 C/73 F 2-4hr
bo Fast demos time and excellent dimensional stability Viscosity A ae
Vis ity Mis Brookfie
Statues, technical articles, prototypes, furniture, picture frames, lecostty Mixed, fockfield 28000 cP
PU, epoxy and polyester casting resins, GFRC pre-cast Cured Product
Use and Cure Information Color Blue
CURE CHARACTERISTICS Density BS ISO 2781 1.14 g/cm3
The standard catalyst for QM 2125 is Moldmaster Purple Elongation at Break 180 37 500
catalyzed at a 10:1 (base:catalyst) ratio by weight. Faster cure ongation at Brea! peor %
can be obtained using DBT, Moldmaster Red, Moldmaster Blue or Hardness Shore A i * 23
a higher level of Moldmaster Purple. However, rapid cure of ; .
condensation cure moldmaking materials can often result in a Linear Shrinkage (%) <0.3.% small sacrifice of physical properties or an increase in hardness. Tear Resistance (Nimm) BSISO34-1 22.6 N/mm/130 ppi The curing process begins as soon as the catalyst is mixed with Tangile Strength Iso 37 3.45 Ni i the base. The material will cure as described in the data above. nse Sena! mm2/ 500 psi under normal temperature (25 C) and humidity conditions (50% Storage RH). Because this system is sensitive to heat and humidity, a poner tu 38 C /100 F change in cure speed may be observed if one or both of these ee SINEGS Temperate variables are altered. A large difference in temperature (+/-5 C) Shelf Life 12 mths or humidity (> 60% 70%) may alter 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.
MIXING
All condensation cure catalysts should be thoroughly mixed prior to catalyzation. CHT recommends that the catalyzed material be tested on a
small area of the mold prior to use. QM 2125 should be thoroughly mixed with the catalyst of choice using a 10:1 (base:catalyst) ratio by
weight. Shake the catalyst well before use. Material should be mixed in a clean, compatible metal or plastic container. 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 during de-aeration.
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.
DE-AERATION
Air trapped during mixing should be removed by vacuum at 29 inches of mercury. During the process, the material will expand, and
intermittent evacuation may be required. Typically, after releasing the vacuum 2 – 3 times, the mass will collapse on itself at which time the
vacuum should be left on for an additional 2 – 4 minutes.
The content stout inthe technical data sheet does not contain information upon which you should rely. tis provided for gonorl information purposes only and does not constitute a product
specication. You mus obtain professional or specialist advice betore taking any action based onthe information provided inthe techrical data sheet
CCHT make reasonable efforts to ensure that information set out in the technical datasheet is complete accurate, and up-o-date. CHT do nol, however. make any representations, warranis or
guarantees (whether express or impiad) that information set out inthe technical data sheet i complete, accurae, or up-to-date or thatthe product willbe sutable fr your requirements. You
should cay out your own testing to determine the appicabilly of such information and whether the roduc willbe sutable. CHT reserve the right fo mody the technical datasheet at any ime.
The CHT technical sorvice department is available to offer lurthr information and advice and should & be needed to look at modiying curren products or custom formulate a new ono to meot
your spectc requirements Pease contact the technical sevice department.
CHT Germany GmbH Postach 12 60, 72002 Tabingen, ismarckstrae 102, 72072 Tobingen. Germany
Telephone: 07071/1540, Fax: 07071/154-290, Email info@cht.com, Homepage: wwww.ch.com /www.cht-licones.com