Quimica - Chemical: Enantiomers /enantiomeros

Quimica - chemical: Guide de création de mannequins en silicone - version 2009 courte

Quimica - chemical: Google G1 T-mobile G1 HTC Dream Android Silicone Skin Case

Quimica - chemical: Mold and Part Making- Brushable Silicone, Spray Hard-Coat, Flexible Urethane Foam

Quimica - Chemical: Ciclo del Fósforo

Quimica - Chemical: Ciclo del Carbono

Quimica - Chemical: Formation of tin crystals

Quimica - Chemical: Ciclo do carbono e efeito estufa

Quimica - Chemical: nitrogeno liquido vol2

Quimica - Chemical: H2SO4 (sufuric acid) + KMnO4 (potassium permanganate)

Quimica - Chemical: Ciclo del azufre

Quimica - Chemical: Detección de oxígeno disuelto en agua

Quimica - Chemical: Introduction to Chemical Engineering | Lecture 1

Quimica - Chemical: Introduction to Chemical Engineering | Lecture 1

Quimica - Chemical: Electroplating

Quimica - Chemical: Copper Sulphate: The Movie

Quimica - Chemical: Zinc/copper galvanic cell

Quimica - Chemical: Testing for unsaturated hydrocarbons

Quimica - Chemical: Formation of silver crystals

Quimica - Chemical: pilha / pila daniel

Quimica - Chemical: PVC Foam

Quimica - Chemical: PVC pipe extrusion

Quimica - Chemical: Wood-Plastic-Composition Production Line

Quimica - Chemical: Lego Style Silicone Rubber Memory Card Case

Hong Kong based Best Rubber Product Ltd. sent us just word about their new silicone rubber SD and Sony Memory stick keychain cases. Because they are kind of neat, I decided to report about them.

The rubber cases are shaped like Lego bricks and can also be stacked together to store several SD cards or Memory sticks.
These cases are still prototypes. Best Rubber Product Ltd. is looking for customers/distributors for them.

Quimica - Chemical: Automatic Polyurethane Tube Recutter

Quimica - Chemical: Maps of the Russian's Gas control in Europe

Quimica - Chemical: Tesla2 secondary coating

Quimica - Chemical: Vuurwerk in plastic buis.

Quimica - Chemical: Silicone and Rubber

Quimica - Chemical: Cesium Metal

Dow Corning Silicones energy efficiency of the windows

Basically, silicones that are or are intended to have contact with food must meet the following specifications:

1) Silicones have to transfer their constituents to foods in quantities that can harm people's health and cause an unacceptable change in the composition of the food or alter the characteristics organoléticas of it.

2) They must be manufactured according to a System for Quality Assurance (ISO 9002 for example) and under the terms set forth in facilitated in the listing document of the Resolution (substances, and authorized additives).

3) The interaction between the substances for the manufacture of silicones should not generate substances that cause damage in people.

4) To prevent the formation of cyclic polydimethylsiloxane with phenyl groups, can not be used as the starting substances, which have linear siloxanes and phenyl methyl groups in the same atom or containing two methyl groups on the same silicon atom (siloxanes and silicones, methyl, phenyl, dimethyl).

5) The migration / emission of any substance from the silicone into the food has to be as low as technically possible. The total quantity of substances that may migrate is 10 milligrams per square decimetre area of material or 60 milligrams per kilogram of food. This is considered as the limit of global migration and coincides with the limit imposed by the directive on plastics in contact with food.

6) It should meet the specific migration limits specified in the technical paper of the resolution on silicones.

7) Migration tests must be carried out following the directions of the Directives 82/711/EEC, 85/572/EEC, 2002/72/EC and its future amendments unless it is technically impossible because of the nature Material and the migration test.

8) It must ensure a proper labeling of the product, if necessary, pre by the user.

In the case of children's products made with silicone and intended to come into contact with food, as in the example of teats for a bottle, also has to comply with specific regulations, especially regarding the content of volatile metal migration and specific migration of certain antioxidants.

Quimica - Chemical: Masters de pigmentos de siliconas con aplicaciones en sellantes de siliconas, Holland Colours

Efficiency, flexibility, and cost-effectiveness Colouring sealants has never been this efficient. We offer our partners the most efficient and cost-effective colouring solutions for the four most common sealants on the market.
We’ve created colouring pastes that will give you the same outstanding performance in automatic or semi-automatic mixing systems. And they’re also suitable for manual mixing.
Colour Consistency You want to know that you will get the same colour with every production run, and that’s what you will get with Holland Colours sealant colorants.
Quality, Experience, and Service With a quarter century of experience in the market, we know and understand your needs. We’ve also worked with all the major suppliers of dosing equipment. Whether you need support selecting the appropriate product, you’re looking for a custom colour or a specific viscosity, or you need technical assistance with production, we stand ready to provide you with the service you need. Global Presence We’ve got a global network of sales and technical service offices. Ready to respond to your call. In person, if that’s what it takes.
For more information on colouring of various sealants click on: Silicone sealants Organic sealants Acrylic sealants Plasticizer-free silicone sealants