Silicone release agent

Fig. 35. OSEE response and peel strength of NBR rubber on steel for HD2 grease (data from Ref. [162]) and silicone release agent contamination (data from R.L. Cause, unpublished work and Ref. [10]). The HD2 grease is slightly photoemitting so the OSEE signal does not decrease to zero at high contamination levels.

Other peculiarities have occurred. As an example of a potential problem that can occur is when a silicone release agent is used when injection molding electrical connectors, etc. It can behave like the metal migration just reviewed. 

A set of metal pattern plates is heated to 200°C-280°C and coated with a silicone release agent. 

Silicone Release Agent 5038. [Polymer Research Cxp. of Am.) Dimethictme emulsion rdease agent for rubber and plastics. 

Silicone Release Agent 503S. [Polymer Reseoch Cnp. Am.] Dimetiucrme enmlskm rdoise agent to tubbo and plastics. 

If a silicone release agent is used, be aware of certain situations. If the fabricated product is to be printed, decorated, bonded, etc. the bond or proper bond probably will not occur. It probably will interfere if electrical connections are to be made on its surface. 

Where the molding is to be painted, it is a good precaution to avoid using waxes or silicone release agents in the first place, or use these only as a primary release agent. 

Silicone Release Agent 5038. See Dimethicone Silicone Resin Emulsion BS 43A. See Polydimethylsiloxane Silicone rubber. See Silicone elastomer Silicone Systems 820, Silicone Systems 872, Silicone Systems 873, Silicone Systems 876 Silicone Systems 878, Silicone Systems 882 Silicone Systems 883, Silicone Systems 886] Silicone Systems 889] Silicone Systems 921] Silicone Systems 922] Silicone Systems 923] Silicone Systems 924] Silicone Systems 925] Silicone Systems 972] Silicone Systems 972P, Silicone Systems 976 Silicone Systems 982] Silicone Systems 982P] Silicone Systems 983] Silicone Systems 984] isilicone Systems 986. See Silicone... 

A general (diagrammatic) cross-sectional view of the mould is presented in Fig. 2, from which it may be seen that the mould consists of three essential parts, viz., (1) an aluminium alloy split female mould, (2) an intermediate silicone rubber male core, and (3) a tapered central aluminium alloy plug. Important features to note are the spacer inserted between the split halves of the outer mould, the available space below the central plug, and the channels moulded into the silicone rubber (top and bottom) to form a reservoir for the resin. Prior to use with epoxide resins, the mould surfaces are treated with a silicone release agent (Tego 290 -Ambersil Ltd.) and cured for 3 hours at 230 C. 

It must be remembered that although silicone elastomer is selfreleasing from epoxy resins and from clean metal surfaces, it will bond to silicone release agents. It is therefore essential to mould the rubber prior to treating any parts of the mould with release agent. 

Both moulds were placed in a press with a closing force of 80 tonnes. For each trial the mould was treated with Dow Corning silicone release agent. 

Turmsilon silicone release agents/lubricant Consult... 

Modification when set Polishing, coating, adhering The use of a material may prejudice the next stage of treatment A silicone release agent may prevent any further adhesion to the surface... 

Another polymer used as a release agent in the glassfibre moulding industry is cellulose acetate, dissolved in acetone. PTFE and related fluorinated polymers can be sprayed on. Silicone release agents are effective with epoxy resins but not usually with unsaturated polyesters, except in hot press moulding. They are also ineffective with certain polyurethanes. 

An important element is the interliner, which mainly is coated with a silicone release agent, as described in Chapter 2.4. Glassine kraft paper is used most frequently. Creped paper, rigid and semirigid films are also used. Besides the peel force, stiffness and conformability are significant features of the interliners. More detailed information is in [211, p. 691-705]. 

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