December, 2016
www.us-
tech.com Wacker Silicone R&D to the Forefront Continued from previous page
and used for sensory purposes. Elastosil film is made under
cleanroom conditions without the use of solvents. The company’s produc- tion process creates extremely thin silicone films in a range of thickness- es from 20-400 µm. The film thick- ness across the entire width and length of the film web deviates from specification by ±5 percent at most. This silicone film enables the devel-
making them less suitable for manu- facturing seals and gaskets exposed to hot fluids. The company’s 3020/60 grade is largely resistant to hydroly- sis and retains its elasticity when in contact with superheated steam. The fast-curing LSR is suitable for high- ly-automated injection-molding, ena - bling large-scale production of mold- ed seals and other products that need to permanently or regularly with- stand hot water or steam. The self-adhesive LSR 3072/50
bonds to a number of thermoplastics, such as polyamide (PA) and poly- butylene terephthalate (PBT) with- out pretreatment. The LSR cures quickly to form an oil-bleeding elas- tomer with high elastic recovery. The
material is particularly suited for sealing two-component molded parts. Typical areas of application include automotive electronics and electrical systems, where the product is used in single-wire seals and connector hous- ings with radial seals applied by injection molding. The 3016/65 is designed especial-
ly for automotive engineering applica- tions. In addition to its excellent mechanical properties the material has enhanced resistance to substances like hot motor oil, even after long peri- ods of time. The company’s LR 5040 is a non-post-cure, low-volatile LSR. The product contains significantly less volatile components than existing products, which allows it to provide
good transparency and mechanical properties without post-curing. In many cases, such as baby care, med- ical and food-contact applications, processors can skip post-curing, sav- ing money and time. The LSR is also well-suited for injection molding.
Silicone Encapsulants for Lighting
Wacker has also released new
encapsulants for LEDs (primary optics), and for optical lenses and coupling elements (secondary optics): Lumisil® 590 and 591, 740 and 770, and 7601. Lumisil 590 and 591 are highly-transparent, addition-curing silicone encapsulants. They form
Continued on next page
Page 75
A technician determines the
compression set of an elastomer by storing compressed material in various conditions, such as superheated steam.
opment and realization of innovative sensors and actuators for segments such as robotics, medical technology, and lifestyle products. The range of applications extends from pumps, switches, electrical relays and mem- branes to movement sensors in tex- tiles.
Liquid Silicone Rubber Wacker has developed several
new grades of liquid silicone rubber (LSR): Elastosil LR 3003/90, LR 3020/60, LR 3072/50, and LR 3016/65, along with LR 5040, which is a new LSR that contains signifi- cantly less volatile components. LR 3003/90 has been designed to cure rapidly to form an exceptionally hard and high-modulus elastomer with a hardness of 90 Shore A. This makes
Stiffness comparison of
Elastosil LR 3003/90 (left) and standard LSR (right).
the material suitable for cost-effec- tive, large-scale production of dimen- sionally stable silicone products. It can also be used as the hard compo- nent in hard/soft combinations. The company has also introduced a liquid silicone rubber that cures to form a steam-resistant and hydrolytically- stable elastomer. Standard silicone elastomers can only withstand superheated steam for short periods,
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