ELASTOSIL E50 N Transparent - Wacker Chemie

ELASTOSIL® E50 N TRANSPARENT is a ready-to-use, one-part silicone rubber which starts curing when exposed to air moisture. Typical curing characteristics are given in the table "Properties Uncured".
As RTV-1 silicones require humidity for curing, free access of air moisture to the silicone rubber is essential. Additionally, the vulcanization time of ELASTOSIL® E50 N TRANSPARENT can be greatly reduced by increasing the level of air's relative humidity.
Please note that, unlike the initial skin formation, the total curing rate of RTV-1 silicones is limited by moisture's diffusion speed in silicone rubber. As increasing the curing temperature has just a minor effect both on the skin forming time and the curing speed, ELASTOSIL® E50 N TRANSPARENT typically is vulcanized at room temperature.
Heat curing is recommended only for applications where the silicone rubber is applied as a thin film (thickness less than 0.5 mm), because otherwise blistering is likely to occur due to the quick release of acetic acid.
After completion of the vulcanization the silicone elastomer may continuously be exposed to constantly changing climatic conditions, UV radiation and high temperature without damage.
Cured ELASTOSIL® E50 N TRANSPARENT usually shows good primerless adhesion to many substrates, e.g. glass, ceramics, metals, plastics and powder coatings. We recommend running preliminary tests to optimize conditions for the particular application.

Removal

If removal of the silicone from machines or dispensing equipment is necessary, white spirit or similar nonpolar solvents are recommended. However, cleaning ideally should take place before the silicone rubber is fully vulcanized. Cured silicone needs to be rubbed off or removed mechanically, if necessary in combination with a swelling agent (solvent) or a chemical silicone remover.

Properties

Color

Transparent

Cured Properties


	Value	Units	Test Method / Conditions
Density (in water, at 23°C)	1.07	g/cm³	DIN EN ISO 1183-1 A
Recommended Service Temperature	-50 to 180	°C	-
Elongation (at break)	200	%	ISO 37 Type 1
Shore Hardness A	35	-	DIN ISO 48-4
Tear Strength	4.7	N/mm	ASTM D 624 B
Tensile Strength	2.6	N/mm²	ISO 37 Type 1

Uncured Properties


	Value	Units	Test Method / Conditions
Curing Speed (at 23°C, 50% r.h)	1.7	mm/day	-
Density (at 23°C, 1013 hPa)	1.07	g/cm³	DIN EN ISO 2811-2
Dynamic Viscosity (at 25°C, Brookfield, spindle 5, 2.5 rpm)	approx. 45000	mPa·s	DIN EN ISO 2555
Skin Formating Time (at 23°C, 50% r.h)	8 - 12	minutes	-

Properties

Uncured

Flowable
Fast skin formation at room temperature
By-product of curing: acetic acid

Cured

Medium hardness
No inhibition of Pt curing silicones
Suitable for applications with food contact

Please Note : Fully cured ELASTOSIL® E50 N TRANSPARENT is suitable for uses under the Recommendation "XV. Silicones" of the BfR and 21 CFR § 175.300 "Resinous and polymeric coatings" and FDA 21 CFR §177.2600 "Rubber articles intended for repeated use", provided that any given limitations on extractable and volatile substances are observed. Residual solvents have to be completely removed from the food contact article.

Note

Curing Conditions : 14 days at 23°C and 50 % relative humidity, 2 mm sheet, no post-curing.

Regulatory & Compliance

Certifications & Compliance: BfR Recommendation,
EC No.1907/2006,
FDA 21 CFR 175.300,
FDA 21 CFR 177.2600,
REACH Exempt (Europe)
Chemical Inventories: AICS (Australia),
DSL (Canada),
ENCS (Japan),
IECSC (China),
PICCS (Phillipines),
TCSI (Taiwan),
TSCA (USA)
Quality Standards: MIL-A 46106

Safety & Health

Safety Notes: While curing ELASTOSIL® E50 N TRANSPARENT releases a total of approx. 3.5 % by weight of acetic acid. These vapors should not be inhaled for long periods or in high concentration. Work areas should therefore be well ventilated. Contact of the uncured silicone rubber with eyes and mucous membranes must be avoided as this can cause irritation. If, despite all protective measures, uncured silicone rubber comes into contact with the skin or eyes, irrigate the affected area immediately with copious amounts of water for several minutes. If the irritation continues, immediately seek medical advice.