China Expandable Rubber Mandrel for Formwork Making

• Customization: Available
• Usage: Industrial
• Material: Neoprene
• Model NO.: expandable rubber mandrel
• Materials: Natural or Neoprene Rubber, and High Strength Synt
• Process: Extrusion, Vulcanization
• Application: Culvert or Small Bridge Formwork Making
• Function: Inflatable Rubber Molding
• Diameter: Popular in 0.2m-3m
• Length: Popular in 1m-28m
• Shape: Round, Rectangle, Octagon, Hexagon etc.
• Feature: Re-Usable, Durable, Easy Cooperation etc.
• Main Markets: Kenya Tanzania etc. Africa Markets
• Accessory: Three-Direction Valve, Hose, Pressure Gage
• Transport Package: Packed in Rolls, with Bags and in Wooden Pallets
• Specification: 900mmx15m, 600mmx12m etc. customized
• Trademark: HengJingGong
• Origin: Hengshui, Hebei, China
• HS Code: 0000000000
• Production Capacity: 5000 Units / Month

Product Description

Product Description

The rubber inflated culvert balloon, also known as the bridge inflatable core mold, is an expandable and contractible cylindrical bag made of rubber with a fiber-reinforced layer, featuring excellent tensile strength, elasticity, and air-tightness. It is primarily used to form cavities in concrete components.

When manufacturing hollow components, the inflatable core mold is placed in the middle of the component and is expanded by injecting compressed air. The inflated core mold can withstand the pressure of concrete, thus effectively replacing traditional wooden, bamboo, and steel molds. When in use, simply open the valve, and the airbag will deflate, making it easy to remove from the cavity.

Category

Based on the shape of the rubber inflated culvert balloon, it can be divided into the following common types: rectangular, round, regular octagonal, flat octagonal, reducer, and elliptical.

Product Parameters

Table 1: Rubber Inflated Culvert Balloon Specifications

Round φ220 mm × 8.5 m
Round φ260 mm × 10.5 m
Round φ360 mm × 14 m
Round φ390 mm × 14 m
Round φ520 mm × 17 m
Octagonal φ360 mm × 760 mm	Reducer φ360 mm × 600 mm × 11 m
Octagonal φ460 mm × 760 mm	Reducer φ460 mm × 600 mm × 14 m
Octagonal φ560 mm × 760 mm	Reducer φ560 mm × 600 mm × 17 m
Octagonal φ710 mm × 760 mm	Reducer φ710 mm × 600 mm × 21 m
Octagonal φ560 mm × 780 mm × 17 m
Octagonal φ710 mm × 800 mm × 21 m
Octagonal φ460 mm × 550 mm × 14 m
Oval φ360 mm × 520 mm × 17 m
Oval φ360 mm × 480 mm × 14 m

Diameter: 
0.2m--3m

Length:
1m--28m

Operating Pressure:

Diameter(mm)	Pressure(Mpa)
150	0.08
160~190	0.08
200~220	0.07
230	0.06
240~280	0.05
300~370	0.045
380~480	0.04
500~520	0.035
550~600	0.03
620~680	0.025
700	0.02
620~680	0.025
700	0.02

Physical Property:
 

item	index
thickness tolerance, mm	3.2±2
shore A	65±5
adhesive strengh N/25MM	≥8
tensile strength, mpa	≥12
elongation at break %	≥350
300% constant elongation,mpa	6
stretching deformation rate	≤20%
suitable temperature,ºC	-10-+80
appearance	no crack, no bubble, impurity length≤3mm depth≤1.5mm and no more than one place each meter

 

Detailed Photos

Packaging & Shipping

Packaging:

1.Plastic Film Wrapping: The airbags are tightly wrapped in plastic film to protect them from water, dust, and abrasion during transit.
2.Palletization: Airbags are usually placed on pallets for ease of loading and stacking. Palletization also helps to protect the airbags from damage.
3.Securing: On the pallet, airbags may be secured with ropes, tapes, or other fastening materials to prevent movement during transportation.
 

Shipping:

1.Sea Freight Containers: Given the large size of pipeline blocking airbags, sea freight is a common method of transportation. Containers provide a secure and protective environment to prevent damage during long-distance shipping.
2.Container Types: Depending on the size and weight of the airbags, standard 20-foot or 40-foot containers may be used, or special-sized containers may be required based on the needs.
3.Securing Inside Containers: Inside the containers, airbags and pallets are properly secured to prevent movement or tipping during transit.

Company Profile

Hengshui Jingtong Rubber Co., Ltd.

Hengshui Jingtong Rubber Co., Ltd., is an experienced and professional manufacturer of construction engineering products. It is located in Hengshui City, Hebei Province, China. 

We have 5 workshops, covers an area of 98000 square meters. We have whole sets of production lines. Our team has 20 technicians ,more than 200 workers and 10 sales.. 

Our products are widely used in domestic markets and important projects. These years, our products having been exported to many countries and received good reputation. Such as Malaysia, Kenya, Uganda, USA, Australia etc.

We see "quality, integrity and good service" as the basis for developing of a factory. We have rigid quality control system from raw material choosing to manufacturing and delivery. What's more, our products have passed ISO and GB inspection. If you are still in anxiety, we can also provide the third party reports of more than 3000 projects in domestic.

Why choose us

FAQ

1. who are we?
We are based in Hebei, China, start from 2013,sell to Domestic Market(40.00%),Southeast Asia(23.00%),Africa(16.00%),North America(7.00%),South America(7.00%),Western Europe(7.00%). There are total about 51-100 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Bridge Expansion Joint,Rubber Waterstop,Swelling Waterstop Strip,Seismic Isolation Bearing,Rubber Bearing Pad

4. why should you buy from us not from other suppliers?
1.More than 20 professional senior technical personnel.
2.There are 10 series,over 200 species and more than 2,000 specifications.
3.All products have been authenticated by the Ministry of Communications.
4.Self-research and development,professional.

5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FAS,CIP,FCA,CPT,DEQ,DDP,DDU,Express Delivery,DAF,DES;
Accepted Payment Currency:USD,CNY;
Accepted Payment Type: T/T,L/C,Credit Card,PayPal,Western Union,Cash,Escrow;
Language Spoken:English,Chinese