diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 315f807..8b09619 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -95,6 +95,23 @@ const Index = () => {
     }
   }, [setModel]);
 
+  const handleLoadDemoCotovelo = useCallback(async () => {
+    setLoadingDemoCotovelo(true);
+    try {
+      const response = await fetch('/models/B126-COTOVELO.ifc');
+      const buffer = await response.arrayBuffer();
+      const result = await convertIFCtoGLB(buffer, 'B126-COTOVELO.ifc');
+      const url = URL.createObjectURL(result.blob);
+      setModel({ fileName: result.fileName, fileSize: result.fileSize, url });
+      toast.success('Modelo demo "B126 Cotovelo" (IFC) carregado!');
+    } catch (err) {
+      console.error(err);
+      toast.error('Falha ao converter modelo demo Cotovelo');
+    } finally {
+      setLoadingDemoCotovelo(false);
+    }
+  }, [setModel]);
+
   const handleEnterViewer = () => {
     if (!model) {
       toast.error('Importe um modelo GLB primeiro');