The SILASTIC™ Moldable Silicone allows refraction, reflection and diffusion in many forms.

More freedom in designing your lighting with optical silicones SILASTIC™ Moldable Silicone

High performance injection molded optical silicones for lamps and luminaires :

Imagine your LED lighting options without the limitations of traditional glass and plastic lighting. With the unsurpassed features and performance of SILASTIC™ Modular Silicones (moldable silicone) you can imagine and create the brightest innovations in LED lighting.

Innovative designs currently impossible to achieve with optical plastics and glass are now possible.

Moldable silicones are suitable for a wide range of applications, including secondary lenses, light pipes, micro-lens arrays, light guides and other optical components.

DOW’s moldable optical silicones offer good resistance to ultraviolet (UV) exposure, optical yellowing and scratch resistance – compared to polycarbonate (PC) plastics and polymethyl methacrylate (PMMA). Due to their chemical skeleton, the silicones are heat resistant and particularly well suited to handle the increasing temperatures of the new high-power LED lighting systems.

SILASTIC™ Moldable silicone versus other optical solutions :

	SILASTIC™ Moldable Silicone	PC	PMMA	Glass
Light transmission	94%	88-99%	93%	95%
Refractive index	1,42	1,58	1,49	1,52
UV resistance	High	Low	Medium	High
Chemical resistance	Medium	Medium	Low	High
Service temperature maximum (°C)	>150	120	90
Yellowing*	Low	High	High	Low
Micro detail replication	High	Low	Medium	Low
Ability to mold large and thick parts	High	Low	Low
Minimum thickness**	<0,5 mm	2 mm	2 mm	–
Draft angle (manufacturing)**	<0°	1 to 2°	1 to 2°	–
Weight	Low	Medium	Medium	High
Flexible material — integration	High	Low	Low	Low

The benefits of optical silicones at a glance:

Flexibility and reproducibility to obtain complex optical shapes
Possibility to add fine surface features
Physical and optical performance in demanding environments (high humidity and UV exposure ( UL746 C(f1))
Excellent optical properties without yellowing
Proven performance with high throughput and less downtime
Mechanical strength
Lighter than other traditional materials

Optical performance

SILASTIC injectable optical silicones offer refraction, reflection and diffusion of light in many forms:

Excellent optical clarity and light transmission combined with resistance to heat, UV and environmental degradation allows these silicones to offer higher light density, low scattering and long term performance.
The long-term stability of optics made with SILASTIC™ silicones has been proven in accelerated aging tests up to 12,000 hours at 150°C, as well as in tests using artificial sunlight (UV A and B) combined with heat (65°C).
Highly versatile, these two-component silicone materials allow you to explore more complex designs, while simplifying the manufacturing process and reducing costs. With low viscosity before curing, Dow’s optical silicones make injection molding of complex shapes easier than with plastics or glass. Silicones require very little injection pressure compared to thermoplastics.

Depending on the needs of your application, these silicones will allow you to produce flexible and soft or firm and resistant components.

The flexible material is easily demolded, even with complex shapes and undercuts.

Fine details, surface finishes and micro-scale optical structures can be molded, and no secondary polishing will be required.

Discover the characteristics of SILASTIC optical silicones and ask for your sample :

	SILASTIC™ MS-0002 Moldable Silicone	SILASTIC™ MS-1001 Moldable Silicone**	SILASTIC™ MS-1001 Moldable Silicone**	SILASTIC™ MS-1003 Moldable Silicone	SILASTIC™ MS-4002 Moldable Silicone	SILASTIC™ MS-4007 Moldable Silicone	SILASTIC™ MS-2002 Moldable Silicone
Color	Translucent	Optically clear	Optically clear	Optically clear	Optically clear	Optically reflecting	White clear
Viscosity (part A), cP	148 000	20 000	40 000	52 000	50 000	28 000	695 000
Viscosity (part B), cP	145 000	9 000	18 000	37 500	21 000	9 500	565 000
Viscosity (mixed*), cP	–	14 000	26 250	42 300	25 000	10 500	–
Working time at 25°C (pot life), hours	48	30	48	48	48	48	48
Specific gravity, kg/l	1,14	1,05	1,07	1,05	1,08	1,08	1,44
Durometer, Shore A (psi) (MPa)	65	87	72	51	84	70	84
	1 300	1 740	1 625	800	1 700	1 700	1 250
	9,0	12,0	11,2	5,5	11,7	11,7	8,6
Elongation, %	270	50	80	325	60	100	65
Linear CTE, ppm/°C	280	250	275	325	250	270	210
Luminous transmittance***	75% à 450 mm 89% ) 760 mm	92% à 10 mm 90% à 25 mm 84% à 50 mm 76% à 100 mm	90% à 10 mm 84% à 25 mm 75% à 50 mm 59% à 100 mm	92% à 10 mm 89% à 25 mm 85% à 50 mm 77% à 100 mm	93% à 10 mm 90% à 25 mm 86% à 50 mm 79% à 100 mm	93% à 10 mm 91% à 25 mm 87% à 50 mm 80% à 100 mm	N/A
Refractive index (nD,589-3 nm)	N/A	1,418	1,413	1,409	1,417	1,413	N/A
Abbe number, a.i. Dielectric strength	N/A 500	48 736	52 584	51 508	52 711	51 650	N/A 525
Dielectric strength (kV/nm)	19,7	29	23	20	28	25,6	20,7
Volume resitivity, ohm,cm	–	–	1.00E+18	1.00E+16	1.00E+14	1.00E+14	3.00E+15
Agency listing	UL94 UL94 746A	UL94 UL94 746A AMECA	UL94 UL94 746A UL746C(f1)(f8) AMECA	UL94 UL746A UL 746C(f1)(f8)	UL94 UL746A UL 746C(f1)(f8)	UL94 UL746A UL 746C(f1)(f8)	UL94 UL746A UL 746C(f1)(f8)