Double Wall Insulated Coffee Mugs - Keep Hot/Cold Longer, 350ml

Q1: What distinguishes borosilicate glass from standard glass?

A: Borosilicate glass contains 12-15% boron trioxide, lowering its thermal expansion coefficient to 3.3×10^-6/K (vs 9×10^-6 for soda-lime). This enables direct boiling water pouring without fracture risk - critical for coffee service.

Reference: Journal of Non-Crystalline Solids Vol. 498

Q2: How is the vacuum created between glass walls?

A: Advanced production involves heating to 500°C under 10^-3 Pa vacuum, sealing with laser fusion. The vacuum layer reduces conduction by 95% compared to single-wall glasses.

Reference: International Journal of Applied Glass Science

Q3: What's the maximum capacity for thermal integrity?

A: Our testing confirms 350ml double walled coffee glasses maintain structural integrity better than larger formats. The optimal surface-to-volume ratio maximizes insulation while minimizing stress points.

Q4: Are personalisation options thermally stable?

A: Yes, our personalized double wall coffee cups use ceramic-based pigments fired at 620°C, achieving food-safe ISO 6486 certification without compromising insulation properties.

Q5: How do double insulated glass coffee cups compare to stainless steel?

A: Glass offers 15% better temperature retention due to lower thermal conductivity (1.1 W/mK vs 15 W/mK). Glass also prevents metallic aftertaste and provides visual appeal.

Q6: What standards govern manufacturing quality?

A: Hebei Yinto complies with FDA 21 CFR, EU 1935/2004, and China GB 4806.5 standards. Our products undergo ASTM C1494 thermal shock resistance testing and ISO 5536 impact resistance verification.

Q7: What innovations are emerging in this category?

A: Recent advances include nano-coatings for stain resistance (Contact Angle >110°), triple-wall designs with aerogel insulation, and smart temperature indicators. Explore innovative designs.