WACKER® 120 – FOOD CONTACT SILICONE SEALANT
Properties
- -100% silicone
- -especially adapted for food and drinking water contact
- -certified by NSF according ANSI 51
- -suitable for food contact per US Food and Drug Administration Regulations No. 21 CFR 177.1210 and 177.2600
- -non-sag
- -good gunability at low (+5 °C) and high (+40 °C) temperatures
- -low-shrinkage during vulcanization
- -remains flexible at low (-40 °C) and high temperatures (+180 °C)
- -rapid crosslinking: quickly becomes tack-free
- -long shelf life
- -excellent adhesion to glass, vitrified surfaces, ceramic tiles, selected plastics and coatings
Technical data
Properties Uncured
| Property | Condition | Value | Method |
| Skin forming time | 23 °C | 50 % r.h | 15 min | - |
| Consistency[1] | - | non-sag | ISO 7390, profile U 20 |
| Density | 23 °C | 1013 hPa | 1.02 g/cm³ | ISO 1183-1 A |
| Extrusion rate - mass flow | 6.0 bar | 23 °C | 200 - 700 g/min | - |
1 23°C
These figures are only intended as a guide and should not be used in preparing specifications.
Properties Cured
| Property | Condition | Value | Method |
| Movement capability | - | 25.0 % | ISO 9047 |
| Modulus at 100 % elongation S2-dumbbell | - | 0.35 N/mm² | ISO 37 |
| Modulus at 100 % elongation joint | - | 0.4 N/mm² | - |
| Elongation at break | - | 250 % | ISO 8339-A |
| Elongation at break | - | 450 % | ISO 37 |
| Hardness Shore A | - | 18 | ISO 868 |
| Tensile strength[1] | - | 0.50 N/mm² | ISO 8339-A |
| Tensile strength[2] | - | 1.20 N/mm² | ISO 37 |
1 (joint)
2 (S2-dumbbell)
Applications
Application fields
- 1. sealing of expansion and connection joints
- 2. sealing in areas where food and drinking water contact is likely
- 3. sealant for silo and container construction
Processing
Sealant must be clean, dry and free of all loose material such as dust, dirt, rust, oil and other contaminants. Non-porous substrates should be cleaned with a solvent and a clean, lint-free, cotton cloth. Remove residual solvent before it evaporates with a fresh clean, dry cloth.
Certification
WACKER® 120 - FOOD CONTACT is certified and classified according to
- 1. NSF ANSI 51
- 2. ISEGA (62. Mtl. BfR)
- 3. US FDAR No. 21 CFR 177.1210 und 177.2600
- 4. ISO 11600 G - Class 25 LM
- 5. DIN 18545-2 - Class E
- 6. TT-S-00230C - Type II, Class A
- 7. BS6920 WRAS
Adhesion
WACKER® 120 - FOOD CONTACT adheres to most non-porous siliceous material, e.g. glass, tiles, ceramics, enamel, glazed tiles and clinker, impregnated, varnished or painted wood and selected plastics.
Users must carry out their own tests due to the great variety of substances. The adhesion on critical substrates can be improved in many cases by pretreatment of the substrates with a suitable primer. If adhesion problems occur contact our technical service.
Restrictions on use
It is the user's responsibility to test the compatibility of the sealant with the adjoining materials. Incompatible substances like coating materials (paints, varnishes and glazes) or organic plasticizer containing rubbers (EPDM, butyl and neoprene) can lead to discoloration or other impairments like loss of adhesion of the sealant. Materials in direct contact with the applied sealant like cleaning agents and materials in indirect contact like gaseous emissions can damage the sealant in its function or change its appearance. Because of the multitude of these materials. Wacker cannot make a general statement to the compatibility of materials with the sealant. In case of doubt the user shall conduct appropriate preliminary tests.
WACKER® 120 - FOOD CONTACT must not be used for insulating glass applications.
WACKER® 120 - FOOD CONTACT should not be used on substrates such as concrete, fibrous cement, and mortar, as the product releases acetic acid during vulcanization.
WACKER® 120 - FOOD CONTACT should not be used in contact with metals such as lead, copper, brass or zinc due to corrosion.
WACKER® 120 - FOOD CONTACT may be discolored in contact with some organic elastomers, e.g. EPDM, APTK and neoprene.
WACKER® 120 - FOOD CONTACT is not suitable for applications involving contact with natural stone, such as marble, granite, quartzite as it can cause staining. WACKER® 460 - NATURAL STONE has been specifically developed for this applications.
WACKER® 120 - FOOD CONTACT is not recommended for structural glazing applications.
WACKER® 120 - FOOD CONTACTis not recommended for sealing of aquaria or for longer-term use under water. WACKER® 121 - AQUARIUM has been specifically developed for aquarium applications.
WACKER® 120 - FOOD CONTACT is not suitable for use as a mirror adhesive.
The time until complete curing may be extended at lower temperature, lower humidity, increasing film thickness or by low volume of air exchange.
The use of tooling agents should be avoided if possible. Otherwise, water or a diluted solution of a little neutral soap or alcohol in water should be sparingly applied.
Packaging & Storage
Packaging
WACKER® 120 - FOOD CONTACT is usually supplied in standard size cartridges that fit all standard caulking guns.
Storage
The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.
When stored in its original, unopened container at or below 32°C (90°F), the shelf life of DOWSIL™ 732 Multi-Purpose Sealant is 12 months from the date of manufacture. However, if the product is exposed to high temperatures or moisture, its shelf life may be significantly reduced.
