hollow glass bubbles for crack prevention

{"cid":"91219424","title":"HN32HS Hollow Glass Bubbles 25-75\u00b5m for Construction Rubber","imgUrl":"https:\/\/img.chinax.com\/nimg\/3b\/2d\/5eb37dc33a63ce37d89c9a463e6c-200x200-1.jpg","attrs":{"Brand Name":"HAINUO","Model Number":"HN32HS","Place of Origin":"SHANXI CHINA","Product name":"HN32HS Glass Microspheres","Application":"Construction,Rubber,Ocean","Diameter":"25-75\u00b5m","Density":"0.15-1.0 g\/cm\u00b3","Compressive Strength":"2000 psi","Chemical Composition":"SiO2, Na2O, CaO, MgO, Al2O3","Color":"White or transparent","True Density":"0.314-0.326","Bulk Density":"0.15-0.18","Dielectric Constant":"1.2-2.2\uff08100MHZ\uff09","Thermal Condictivity":"0.108"}}

{"cid":"91215164","title":"150MM Glass Machinery Parts Beveled Plastic Waterproof Cover Linear Edging","imgUrl":"https:\/\/img.chinax.com\/nimg\/6e\/fa\/068b8df244bca6b90d40a4e9e005-200x200-1.jpg","attrs":{"Price":"USD1.53-3.07 pieces","Brand Name":"PBLOG","Model Number":"GSM-FST","Minimum Order Quantity":"10pieces","Place of Origin":"GD","Payment Terms":"T\/T, Western Union","Supply Ability":"10000 per week","Packaging Details":"Carton","Product Name":"Waterproof Cover","MATERIAL":"Rubber","SIZE":"150MM","Application":"Glass Linear Edging Machine Motor"}}