How to Identify Real & Fake Borosilicate Glass Tableware?

Qualified borosilicate glass tableware shall be clearly marked with official food-contact material standards.

Domestic products are marked with GB 4806.5-2016; exported products generally adopt ASTM E438-18.

Genuine products are printed with marks of heat-resistant glass and microwave applicability. High-quality products indicate boron content ranging from 12% to 15%. Avoid unmarked or vaguely printed products.

Borosilicate glass features a low thermal expansion coefficient and excellent resistance to extreme temperature changes. After refrigerating for 24 hours, pour boiling water directly into the glass. Authentic borosilicate glass remains intact without cracks, while ordinary glass is prone to breakage. Wrap the glass with a towel during the test to prevent scalding.

Genuine products feature high light transmittance with pure glass texture, no bubbles or haze. A clear and crisp metallic sound is produced when gently tapped. By contrast, ordinary glass appears dark and greenish with poor transparency and internal impurities, generating a dull sound when knocked.

Premium borosilicate glass boasts high temperature resistance and excellent moldability. Authentic products have a thin and uniform wall thickness of 1.2-2.2mm, and double-layer structures are lightweight and transparent. Inferior counterfeits are usually thicker than 4mm with clumsy texture and rough edges to compensate for poor material strength.

Borosilicate glass is acid and alkali resistant with stable chemical properties. Soak the glassware in white vinegar or lemon juice for 24 hours; genuine products show no whitening, discoloration or corrosion. Ordinary glass is susceptible to acid erosion, posing potential safety risks for long-term use.

Due to high raw material and production costs, qualified borosilicate glass cannot be extremely cheap. Low-cost sets at an ultra-low price are mostly counterfeits made of soda-lime glass.

Choose regular branded products and reject unqualified low-cost goods.

Laboratory testing is adopted for accurate material identification, which is a necessary procedure for official factory quality inspection.

Standard value of genuine borosilicate glass: 3.3×10⁻⁶/℃.

Lead ≤ 0.5mg/L, Cadmium ≤ 0.25mg/L (no harmful precipitation).

Mohs hardness reaches 6.5 for scratch resistance, while ordinary glass is only 5.5.

Note: Prioritize regular manufacturers with complete labels and quality inspection reports. Stay away from unqualified products. Select certified borosilicate glass to ensure daily dining safety.