Temperature cure time

Cure time - The time required to produce vulcanization at a given temperature. (Cure time varies widely, being dependent on the type of compounding used and the thickness of the product.)... 

FIGURE 16.19 Fluorescence spectra of Probe 3 in topcoat as a function of room temperature cure time. 

The ultimate performance of a durable-press resin system is dependent on a number of factors, such as cloth type, resin type and level, cure temperature, cure time, and system pH. 

FIGURE 8 Effect of TEC concentration and curing conditions (curing temperature-curing time) on the chlorpheniramine maleate release in 0.1 M pH 7.4 phosphate buffer. Ahhreviatiom TEC, triethyl citrate. Source From Ref. 72. 

Several parameters of interest were considered in this work the one concerned with the operational conditions of the rubber in the storage bulb as time and temperature, the other with the working conditions in the mold as mold temperature, cure time, thickness of rubber sheets, cure enthalpy (or % vulcanizing agent). 

Thickness of the coating Application temperature Curing time at 25°C... 

Mold temperatures range from 155 to 170°C both for polyester and epoxide resin compounds, with molding pressures ranging from 5 to 100 MPa depending on the type of compound to be processed, mold design and temperature. Cure time in the mold (excluding pre-heat time) is usually of the order of 10-30 s per millimetre of wall thickness for both types of compound. 

Vulcani2ation is a chemical process for improving an elastomer compound s performance. However, in most cases not all of the desired properties reach their optimum levels simultaneously. One of the mbber compounder s key responsibiHties is to achieve a balance of the most important property requirements by the proper selection of cure system (chemical) and time—temperature cure cycle (physical). 

Proof Casting of Dies and Molds. Low melting ahoys make the process of diemaking faster and easier. The low temperature ahoys can be cast into a mold pattern at virtuahy any point in the manufacturing process without long delays in production and without the possibhity of heat distortion. These ahoys produce a casting that is exact in detail, requires no curing time, and is completely reusable. 

Unsaturated polyester resins predominate among fiber-reinforced composite matrices for several reasons. A wide variety of polyesters is available and the composites fabricator must choose the best for a particular appHcation. The choice involves evaluation of fabrication techniques, temperatures at which the resin is to be handled, cure time and temperature desked, and requked cured properties (see Polyesters, unsaturated). 

Preparation of paint, its viscosity, solvent, thickness of one coat, air pressure, curing temperature and time of curing will remain the same as for the primer (Table A13.4). 

The temperature and time of curing, as indicated in Table A 13.4, are indicative and for general guidance only. They may vary with the type and quality of paint and effectiveness of the furnace. For exact details, consult the paint manufacturer. The operator may also vary the given parameters slightly, based on his own experience and the end results. 

The paint is then cured in an oven. The curing time will depend upon the thickness of coat, shape of the workpiece and type of oven and its effectiveness. Generally, a coat of up to 60-70 microns at a stoving temperature of 180-200 C (depending upon the type of powder) should take around 10-12 minutes to cure. Contact the manufacturers for exact details. 

Mould temperature Injection pressure Screw back pressure Screw speed Curing time... 

Figure 24.9. Effect of cure time on some properties of M-F mouldings. Cure temperature cellulose filled 295-308°F mineral filled 300-320°F O glass-filled material, asbestos-filled material, A cellulose-filled material (a) Cross-breaking strength (b) tensile strength (c) impact strength (d) impact strength (e) water absorption (rag), boiling water 30 min (f) cold water 24 h, 23°C ...

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