Mould release agents external

Mould release agents, up to 0.2 %, can also be added into the polymerisation process. Zinc stearate is the most widely used mould release agent. External lubricants can be added during or after the finishing process during PS production. The most common external lubricants are N-N ethylene bis stearamide and polyethylene glycol 400. 

The monograph states that the nature and amount of additive used will depend on the type of polymer, the process used to convert it into a container and the intended purpose of the container. Approved additives include antioxidants, stabilisers, plasticisers, lubricants, colour and impact modifiers. Anti-static and mould release agents can be used only for containers for oral and external preparations. Specific permitted additives are given in the specification for the material within the pharmacopoeial monograph. 

Sustainable external lubricants (mould release agents) are mainly waxes, such as bee wax, Carnauba wax and rapeseed oil, where boiling points are critical [35]. As long as the boiling point of the sustainable external lubricant is not lower than the processing temperature of the melt, it can be considered to be a good candidate. 

Axel claims that its latest external mould release agent XTEND 19MDR can increase the lifetime of the room temperature vulcanised silicone rubber moulds used in polyurethane and... 

Note SMCs are compounded with internal release agents, thus eliminating the need to apply external mould release agents between every cycle. 

Kanstick external mould release agents Specialty Products... 

External mould release agents, on the other hand, are sprayed into the open mould. They are often based on paraffins, soaps and oils, e.g., silicone oil. Because of the manner of treatment, these mould release agents may be found not only on the surface but also in layers near the surface. Proprietary non-transfer mould release agents such as Frekote are recommended to ensure optimum bonding surfaces. 

The remainder of this entry is concerned with external mould release agents for use with thermosetting resins, mainly in open mould and low throughput operations. In the case of large fibre glass polyester or epoxy... 

Whereas bis(stearoyl)ethylenediamine (EBS), generally known as amide wax, shows an unusually high melting point of 140°C and has a good balance of internal and external lubricating properties for PVC, the fatty acid monoamides, more particularly oleamide, stearylamide, and erucamide show a pronounced external effect. They are more particularly used as lubricants, mould release and antiblocking agents in polyolefins. 

Antistatic additives can be classified by application method, as internal and external, and by chemistry, as anionic, cationic, and non-ionic. Internal agents are normally compounded at 0.1-3.0% by weight and have a slight compatibility with the polymer, but the molecule has a hydrophilic head forcing it to migrate to the surface and attract moisture from the environment, which increases the surface conductivity. These are easy to use and have low addition rates, often also providing other benefits such as improved processability and mould release. 

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