Overview
Perforated silicone stoppers are specialized closures designed for laboratory and industrial equipment. They combine the elasticity and durability of silicone with pre-drilled holes to accommodate tubing, thermometers, or other instruments. Unlike rubber stoppers, silicone offers superior resistance to heat, chemicals, and aging, making it a preferred choice for long-term applications. These stoppers are commonly used in chemistry labs, pharmaceutical production, and biotechnology setups. Their flexibility ensures a tight seal even with irregular glassware openings, while the holes allow for controlled gas exchange or sample extraction without compromising sterility.
Physical and Chemical Properties
Silicone stoppers exhibit remarkable thermal stability, withstanding temperatures from -40°C to 200°C without losing elasticity. The material’s low surface tension prevents adhesion to glass, enabling easy insertion and removal. Its hydrophobic nature resists water absorption, reducing contamination risks. Chemically, silicone is inert to most acids, bases, and organic solvents, though prolonged exposure to concentrated sulfuric acid or ketones may cause swelling. The perforations are typically precision-molded to maintain consistent diameters (e.g., 3mm, 5mm, or custom sizes) without fraying edges that could damage inserted tubes.
Main Applications
In laboratories, these stoppers secure Erlenmeyer flasks during reflux or distillation, often with condenser tubes passing through the holes. Bioreactors use them for aeration ports, while fermentation tanks rely on their airtight seal to maintain anaerobic conditions. Industrial applications include sealing chemical storage drums with dip tubes or acting as gaskets in automotive fluid systems. Their autoclavability (up to 121°C) makes them indispensable in sterile processes like cell culture or media preparation.
Safety and Storage
While silicone is generally non-toxic, stoppers used in food/pharma applications should be FDA-compliant or USP Class VI-certified. Avoid ozone-generating equipment nearby, as ozone can cause surface cracking over time. Store stoppers in clean, dry conditions away from sharp objects that could puncture them. For critical uses, inspect for tears or deformation before each use. Discard if discolored or hardened, as this indicates material degradation.
B2B Procurement Guide
Bulk buyers should prioritize suppliers offering material certifications (e.g., RoHS, REACH) and dimensional consistency. Key specifications include shore hardness (softer stoppers provide better seals but wear faster), hole placement (central or offset), and color-coding options for workflow organization. For cost efficiency, consider purchasing assorted kits for small-scale labs or customized designs for large-scale production. Leading manufacturers often provide samples for compatibility testing with specific chemicals or temperatures.
Related Manufacturers
- 主营：氟胶条、密封胶帽、橡胶密封、硅胶塞、硅胶防油罩、减震缓冲硅胶条、硅胶保护套、圆顶阀密封圈、切换阀密封件、橡胶异形件定制
- 主营：硅胶套、硅胶圈、硅胶餐盘、硅胶手表、硅胶儿童碗、医用硅胶管、高透明硅胶管、医疗硅胶塞子、双色硅胶耳帽、医用硅胶面罩、阻燃硅胶保护套、硅胶汽车连接器、硅胶防尘保护套、密封圈、防水硅橡胶圈
- 主营：锁线扣、吊灯线扣、电缆固定夹、螺丝孔胶塞、压线扣、压线片、塑胶螺丝、接线端子、接线盒、灯饰塑胶配件、电缆固定头
- 主营：橡胶定制加工、聚氨酯制品、橡胶密封圈、硅胶定制加工、硅胶堵头、硅胶包铁件、硅胶密封块、硅胶塞、硅胶帽、硅胶垫片、硅胶3D打印刮刀、硅胶球、硅胶刮刀、硅胶密封套、金属包胶硅胶件、硅胶软管、橡胶密封块、O型圈、氟橡胶密封圈、橡胶球、金属包胶、橡胶座、骨架油封、三元乙丙橡胶垫片、橡胶条
- 主营：硅橡胶制品、橡胶制品、橡胶圈、硅胶按键、硅胶塞、硅胶垫、硅胶密封件、硅胶保护套、硅胶制品、硅胶餐具、硅胶手环、硅胶表带、硅胶密封条、表带、硅胶吸盘、硅胶数字按键、硅胶垫圈、轻奢撞色女款替换带、橡胶垫片、油封、橡胶防滑垫、橡胶脚垫、o型圈、创意免打孔挂绳、音响手机配饰挂件
- 主营：胶帽、真空吸盘、高温堵头、耐高温胶带、胶塞、硅胶塞、硅胶套、螺纹塞、高温胶塞、堵孔塞、高温螺纹塞、绿色高温胶带、PET高温胶带、铜箔胶带、铝箔胶带、绿硅胶、防烤胶带、高温胶套、高温保护套、螺栓保护套、铜箔胶贴、铝箔胶贴、防烤贴纸
- 主营：护线圈、橡胶脚垫、脚垫、硅胶塞、硅胶垫片、硅胶脚垫、机脚垫
- 主营：密封圈、橡胶垫圈、水泥管道胶圈、实心空心硅橡胶堵孔塞、可定制橡塑制品
- 主营：定制-pu、密封圈、隔膜垫、硅胶圈、硅胶塞、试管塞、履带板、硅胶垫、橡胶塞、梅花垫、振动筛、橡胶圈、弹力球、输送机、减震垫、软连接、橡胶块、密封件、聚氨酯、硅橡胶、价廉-pu、橡胶盖、包胶辊、橡胶球、优力胶
- 主营：防撞扶手、马桶扶手、塑料配件、生产实心防水橡胶塞、注塑橡胶制品、尼龙加工件、轨道、隔帘、PVC医院防撞扶手、无障碍卫生间扶手、洗脸盆扶手、折叠淋浴凳、多功能L型扶手、小便池扶手、140款走廊扶手、159款防撞扶手、输液轨道、L型隔帘轨道、U型隔帘轨道、输液吊杆、隐藏式输液轨道、防撞护板、铝合金护角、素色隔帘、49暗装轨道、37暗装轨道
- 主营：玻璃仪器、实验仪器、实验室仪器、试管塞、塑料试剂瓶、广口瓶、试剂瓶、烧杯、高硼硅培养皿、塑料离心管、塑料吸头、塑料培养皿
- 主营：电瓶夹、充电器、搭火线、水池橡胶塞、强力胶、捕鼠器、按压嘴、嘴泵头、控制器、蚝油瓶、小拉手、瓶压嘴、鼠神器、墙壁门、连接线、粘鼠板、电瓶线、逆变器、螺丝贴、补鞋胶、粘鞋胶、标卡尺、老鼠夹、转换器、pu皮鞋aj、橱柜把手
- 主营：测电笔、瓷砖开、螺丝刀、硅胶堵头、瓷砖刀、电工笔、电钻转角、弯头拐弯、电钻拐角、数显电工、划厚瓷砖、拐弯钻头、金刚石划、电动拐角弯、电钻万向弯曲、多彩电笔水晶
- 主营：密封圈、密封条、减震器、硅胶板、橡胶塞、硅胶塞、硅胶柱、硅胶条、硅胶圈、硅胶管、硅胶垫、磨砂硅胶板、硅胶垫片、硅胶制品、发泡硅胶板、护线圈、橡胶条、油封、o型圈
- 主营：高低温试验箱、恒温恒湿试验箱、冷热冲击试验箱、硅胶塞、快速温变试验箱、紫外线老化试验箱、高低温低气压试验箱、高低温冲击试验箱、盐雾试验箱、淋雨试验箱、砂尘试验箱