Choose the plastic material for the lid
Each plastic containers (generally) has a little the symbol of a triangle on the bottom, triangle is punctuated with 1-7 Numbers.Each number represents their materials, PET “1”, HDPE”2″, PVC “3”, LDPE “4”, PS”6″, is often used to make water bottles, carbonated beverage bottle, clean bath product containers, toys, stationery, instant noodles, cling film, plastic box, snack box and so on.
“5” PP (polypropylene), is the safest plastic material, the only plastic can be put into the microwave oven. Now it is also used to make water cups, milk bottles and so on. The classification of plastic here is mainly to tell you that the insulation cup sealing cover made of PP material is the best. All the major brands also have PP sports cups or PP kids cups.
Choose 304 stainless steel
201 stainless steel: acid resistance, alkali resistance is much weaker than the 304 level, mostly used in the production of industrial steel tubes, decoration materials, watch case, watchband.
304 stainless steel (18/8) : internationally recognized food-grade stainless steel.18/8 means that the stainless steel material composition contains 18% chromium, 8% nickel.The material meet this standard has excellent corrosion resistance and good processing performance. High temperature can reach 1000-1200 degrees, is an absolutely safe and hygienic material.It is the safest raw material for the liner of high quality thermos cups.
316 stainless steel (18/10) : medical grade stainless steel! Its corrosion resistance, easy processing and welding performance is better than 304, but the cost is very high. If there is no special requirements, the manufacturers will not use in addition to the medical equipment in the hospital.
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