Problems of resin coated sand in critical applications

Problems of resin coated sand in critical applications :
                  Resin coated sand is a popular medium for core making and moulding in foundries making critical castings. However, foundry men come across various problems during usage of resin coated sand. We at Samarth treat these problems as inputs for development of suitable grade of SAMARTH COATED SAND. We have listed a few of them for ready reference to help in filling Online Enquiry Form.

Type of Core	Problem
Thin section cores such as water jacket cores	1. Warpage during core ejection     2. Cracking during storage     3. Cracking during pouring     4. Boiling     5. Core shift and hence        dimensional variation     6. Sand fusion
Thin section joining to a thick section	1. Veining     2. Fining     3. Sand Fusion     4. Core Cracking
Thicker section cores - Gas blowholes	1. Under curing     2. Fining/veining     3. Seams/plates

Typical problems of precoated sand in critical shell moulding applications

Type of Mould	Problem
Small size CI Castings	1. Poor finish     2. Poor reproducibility of edges     3. Sand fusion in deep pockets
Medium CI Castings	1. Poor finish     2. Sand fusion at corners     3. Inferior dimensional accuracy
SG Iron Castings	1. Bulging due to secondary         expansion     2. Dimentional accuracy not         meeting specified requirements     3. Sand fusion in deep pockets     4. Veining