Storage measures for binder chemicals

Binder chemicals cany specific manufacturer s recommendations for storage. Failure to comply with these recommendations will result in unusable or sub-standard products that either require disposal as special waste or lead to poor casting quality due to sub-standard moulds/cores. Table 4.2 siunmarises the quality problems arising from the incorrect storage of liquid binder chemicals. Correct storage takes account of these problems. 

Problem Effect on product Implications Effect on castings 

Ejqrosme to excessive cold Aqueous-based products may freeze Product segregation may occur, causing mould failure. Affected products require disposal Casting production may not be possible 

Ejqrosme to excessive heat and sunlight Premature ageing, cross-linking of resin and increased viscosity Poor mixing properties, low mould strengths and poor resistance to high temperatures Fining defects 

Prolonged storage or cold storage Increased viscosity Dispersion onto sand grains difficult. Sand mixture flows less well and is difficult to compact. Low-strength moulds Erosion, exogenous (sandy) inclusions firming and dimensional faults 

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