How to Repair Hairline Cracks on Ceramic with Strong Mechanical Integrity? We often receive valuable ceramic items and vessels with long hairline cracks and we need to decide if we should break the crack completely for a better cementing job. When the hairline crack goes through design details and breaking it will increase the required repair areas, we often use the 'pegging' method illustrated below. The pegging technique ceramic repair requires the walls of the vessel to be thick enough to accept a peg. When pegging is done properly, it is an excellent way to restore durability to the repaired ceramic object with a hairline crack prior to continuing the restoration process. Below, we repair a cracked jar with some step by step illustrations and explanation. To see examples of a cracked bowl, cracked mug, cracked plate, cracked vase, cracked urn or a cracked jag, see our. ![]() Repair Broken Ceramic MugLong hairline crack Grind channel across and along crack In this case, we used 12 gauge copper wire. We textured the surface for better bond with the adhesive. The razor blade is inserted in the crack to widen the gap for better epoxy penetration to the walls of the crack. Exfo otdr viewer software. Gauge 12 copper wire in a vice Grind surface for better adhesion Cut copper to size (peg) Clean surfaces with alcohol (91%) Wedge a razor blade to widen crack Shape peg and try for proper fit Heating the mug and the epoxy to 120-140 degree F will make the epoxy more liquid and enables it to penetrate through the crack. Warm the epoxy before mixing it and make sure the two parts do not touch each other to avoid cure time from starting (we use microwave oven to warm epoxy). 120-140 degrees however will reduce to epoxy cure time from 5 minutes to about 2 minutes so make sure all you need is near you. Heat mug for optimum epoxy cure Warm epoxy to be thinner (microwave) Mix the warmed 2-part clear epoxy Place the mug so that the crack and the grinded channels are on the bottom before placing the mixed 2-part epoxy.
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