What tolerances can you achieve?

Injection moulding typically achieves tolerances around ±0.1 mm for many engineering-grade applications, depending on material and tool design. Dimensional stability is controlled through structured DFM review, precision tooling and validation processes.

Do you provide in-house tool design and maintenance?

Yes. SGH operates an in-house toolroom supporting tool manufacture, modification and lifecycle servicing. Approximately 85% of tooling is fulfilled through our internal engineering capability.

Do you support PPAP and validation requirements?

We support structured tool validation and formal PPAP submissions where required, including dimensional reporting and documented process control.

What machine sizes do you operate?

Our injection moulding capacity ranges from 22 to 650 tonne clamp force, supporting both small precision components and larger industrial mouldings.

Do you support low-volume or high-mix manufacturing?

Yes. SGH manufactures approximately 1,000 active SKUs annually, operating within a disciplined high-mix environment supported by structured scheduling and tool lifecycle management.

Do you operate a cleanroom facility?

SGH operates a Class 8 cleanroom for controlled assembly and regulated manufacturing environments, supporting medical and technically demanding sectors.

Technical Resource Centre

Part of SGH Technical Resource Centre – Home

At SGH, we have been designing, manufacturing and assembling injection moulded components in the UK for over 40 years. This resource centre reflects how we operate in practice; from Design for Manufacture through to PPAP, serial moulding, cleanroom assembly and long-term tool lifecycle management.

The Technical Resource Centre provides engineering-led guidance and technical reference for plastic injection moulding, tooling strategy, process control, materials selection and lifecycle best practice. Each topic links to an in-depth resource page.

ISO Certification downloads are available for review • See what Industries SGH Operates in• Explore our Injection Moulding services or Toolroom services.

How to Use This Resource Centre

Each section reflects real production capability within our 25-press facility, supported by ISO-governed quality systems and structured lifecycle management. The pages within this Centre are structured to follow the lifecycle of a typical injection moulding programme:

Jump to Engineering & Tooling Strategy
Jump to Production & Process Control
Jump to Quality, Sustainability & Operational Infrastructure

Engineering & Tooling Strategy

This section covers pre-production engineering decisions, tooling design and lifecycle control.

Tool Design & Toolroom Engineering

Understanding how engineering discipline translates DFM intent into steel, protecting dimensional accuracy and long-term production stability.

View Tool Engineering

Design for Manufacture (DFM)

Understanding how early-stage engineering review protects tooling investment and dimensional stability.

View DFM

Tool Lifecycle & Maintenance

Tooling as a managed production asset rather than a static purchase.

View Lifecycle Maintenance

Tool Validation & PPAP

Structured validation processes prior to serial production.

View Validation & PPAP

UK vs Overseas Tooling Strategy

A structured comparison of tooling routes based on lifecycle risk, validation control and carbon impact.

View Tool Origins

Production & Process Control

This section covers live moulding process control, dimensional stability and high-mix manufacturing discipline.

Injection Moulding Process

An overview of how injection moulding operates at SGH, including machine capability, process control and production integration.

View Moulding Process

Dimensional Control & Tolerances

How tolerance capability is defined, validated and maintained throughout tool life.

View Tolerance Capability

Low Volume & High Mix Manufacturing

Managing approximately 1,000 active SKUs annually through structured planning.

View Volume & Mix Impact

Materials & Polymer Behaviour

How polymer selection influences shrinkage, wear, dimensional control and lifecycle cost.

View Materials

Quality, Sustainability & Operational Infrastructure

This section covers compliance systems, regulated manufacturing environments and supply chain integration.

Quality Systems & ISO Standards

Structured governance across validation, production and lifecycle management.

View our QMS

Class 8 Cleanroom Assembly & Controlled Environment Manufacturing

Controlled Class 8 cleanroom assembly supporting contamination-sensitive applications.

View Class 8

Sustainability & Scope 3 Reporting

Embedding measurable environmental governance within manufacturing operations.

View Sustainability

Warehousing, Logistics & JIT Integration

Integrating production with 10,000 sq ft of warehouse space to support stable supply.

View Logistics Options

SGH Client Portal

Digital visibility of delivery performance, tool lifecycle data and Scope 3 emissions reporting.

View the SGH Portal

A Structured Manufacturing Partnership

The SGH Technical Resource Centre reflects our belief that manufacturing stability is engineered through systems, not promises.

By integrating:

Design for Manufacture
Controlled tool validation
Preventative servicing
High-mix planning
Warehousing integration
Environmental governance
Digital transparency

we provide a structured and accountable manufacturing environment.

If you are reviewing a new injection moulding programme or reassessing supply stability, we welcome an engineering-led discussion aligned to tooling strategy, validation and lifecycle performance.

Speak to Our Engineering Team