Dow MS-1003 Moldable Silicone

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Description for Dow MS-1003 Moldable Silicone

A two part component is a medium viscosity, medium Shore A hardness, fast curing optical molding resin and good resistance to environmental aging. It is injection or compression molding for primary or secondary lenses, light pipes, light guides and other optic devices.

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Application Type	Casting / Moldmaking: Optical molding , Casting / Moldmaking: Injection molding
1 Part or 2 Part	2-Part
Material Form	Liquid
Substrate	Glass, Plastic
Industry	Injection or compression molding for primary lenses, Headlamp assemblies, Light pipes, Other optic devices, Optical Molding, Light guides , Injection or compression molding for secondary lenses, Optical market
Manufacturer	Dow
Chemistry	Silicone, Polydimethylsiloxane
Cure Method	2-Part Cure, Heat-Cure
Demolding Time (min)	<0.28, <1.05
Cure Time (min)	Fast
Viscosity (cPs)	Medium, Good mold flow, 42,250
Non-Yellowing	UV Resistance: Less yellowing than some plastic
High Temperature Resistance (°C)	150, Better heat resistance than plastic, Thermal stability
Low Temperature Resistance (°C)	-45, -55
Volume Resistivity (O)	1.5e16 (ohm.cm)
Light Refractive Index (RI)	1.4090
Key Specifications	UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 746C

Best Practices for Dow MS-1003 Moldable Silicone

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Technical Data for Dow MS-1003 Moldable Silicone

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Overview

Application Type
- Casting / Moldmaking : Moldable Optics - Optical molding
- Casting / Moldmaking : Injection Molding
1 Part or 2 Part
- 2-Part
Material Form
- Liquid
Substrate
- Glass
- Plastic
Industry
- Optical - Other optic devices, Injection or compression molding for primary lenses, Optical Molding, Light pipes, Light guides , Injection or compression molding for secondary lenses, Optical market
- Headlamp - Headlamp assemblies
Chemistry
- Other - Polydimethylsiloxane
- Silicone
Application Method
- Dispenser - Automated meter, mix equipment, Dispense equipment
Cure Method
- Heat - Heat-Cure
- 2-Part Cure
Key Specifications
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : 746C - UL 746C

Specifications

Cure Specs

Demolding Time (min)	<0.28, <1.05
Cure Time (min)	Fast
Viscosity (cPs)	Medium, Good mold flow, 42,250	Test Method
Work / Pot Time (min)	2,880	Test Method
Mix Ratio	1:1 (by weight), 1:1 (by volume)

Bond Strength

Tensile Strength (psi)	800

Material Resistance

UV Resistance	Intrinsic UV resistance
Non-Yellowing	UV Resistance: Less yellowing than some plastic
Environmental Resistance	Good resistance to environmental aging
High Temperature Resistance (°C)	150, Better heat resistance than plastic, Thermal stability
Low Temperature Resistance (°C)	-45, -55
Moisture/Humidity Resistance	Moisture resistance

Conductivity

Dielectric Strength (V/mil)	500
Volume Resistivity (O)	1.5e16 (ohm.cm)

Hardness

Shore A Hardness	Medium, 51	Test Method
Elongation (%)	325

Other Properties

Light Refractive Index (RI)	1.4090	Test Method
Coefficient of Thermal Expansion (CTE)	325 (ppm/°C)	Test Method

Not Good For

Don't Use For	Organotin compounds, Other sulfur containing materials, Other organometallic compounds, Silicone rubber containing organotin catalyst, Sulfur, Polysulfides, Polysulfones, Unsaturated hydrocarbon plasitcizers, Some solder flux residues

Best Practices for Dow MS-1003 Moldable Silicone

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1. Application
  
  These products are compatible with commercially available equipment and industry standard processes. These materials can be pumped, meter mixed and molded similarly to liquid silicone rubber. Mix at 1 to 1 ratio. They are lower in viscosity than traditional LSR materials but they are not shear thinning as the LSR’s are. This allows for reduced pressure in the pumping and mixing areas but similar performance in the injection unit compared to LSR’s. In the mold the heat does thin the material dramatically allowing for good flow and reproduction in the mold cavity. Dow OS fluids are recommended to clean cured or uncured silicone residue from application equipment.
2. Mixing
  
  Dow silicone 1 to 1 optical molding materials are supplied in two parts that do not require lot matching. The 1 to 1 mix ratio, by weight or volume, simplifies the proportioning process. To ensure best properties Parts A and B must each be thoroughly mixed, inadequate mixing and may result in incomplete cure or reduced physical properties. Automated meter, mix and dispense equipment may be utilized.
  
  In liquid injection molding operations where changeover from a standard general purposes LSR to a moldable optical silicone may be done frequently, it is highly recommended to dedicate a separate dosing and mixing system, e.g., pumps, valves, hoses and static mixer for the moldable optical silicones series.
3. Deairing/Degassing
  
  In applications or molds that are sensitive to air entrapment, de-airing or vacuum application in the mold may be helpful.
4. Curing
  
  Cure reaction begins with the mixing process. Initially, cure is evidenced by a gradual increase in viscosity, followed by gelation and conversion to a solid elastoplastic material. Pot life is defined as the time required for viscosity to double after Parts A and B (base and curing agent) are mixed and is highly temperature dependent. Please refer to the data table. The cure time depends on the thickness and the cure temperature used.
Comparable Materials for Dow MS-1003 Moldable Silicone

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Spec Engine^® Results
- LS-6941(Nusil)
  Nusil LS-6941 is a 2-Part Room temperature Solvent free Liquid used to Adhere Optical glasses, Optical plastics and Fluoroplastic
- Silastic MS-1001 Moldable Silicone(Dow)
  A medium viscosity, high Shore A hardness, two-part, 1:1 ratio, fast-curing optical molding resin for producing optical parts with good resistance to environmental aging.
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